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Print this article - Accademia Italiana di Scienze Forestali
Research Paper / Contributo di ricerca ANNA MARIA MEONI (*) (°) - PAOLA IMOLA (**) - FRANCESCO BIONDI (***) A DATABASE ON TRUFFLES DIFFUSION ON FORESTATION PLOT: THE CONTRIBUTION TO BIODIVERSITY BY FOREST ECOSYSTEM (*) Owner “Nocella” Forestry Estate Ficulle (TR), viale del Quattro Venti n. 246, 00152 Roma (RM), Italia. (**) Statistician consultant “Nocella” Forestry Estate, via Cesare Pascarella n. 55, 00153 Roma (RM), Italia. (***) Geology Professor “Tuscia” University Viterbo (VT), Italia. (°) Corresponding author; [email protected] The “Nocella” forest farm (Ficulle Umbria Italy) presents database collection of spontaneous truffle production following the forestation of fields previously cultivated with traditional crops. Critical points and constraints to reach the assessment of the symbiotic plants and the truffle quarries are explained. Some of the first results of the Multivariate Analysis MVA analysis on the database and soil analysis are reported and the map of truffle quarries and “cultivar” and forest plants is presented. The non-wood forest products, as truffles are, have agro- forestry theoretical and operational consequences for the conservation of biodiversity. The data popularization of detailed data of truffle production is not popular, even it is a scientific task to fulfill a complete understanding of the ecosystem. The truffle’s “underground” economy and the anthropological convictions are hostile surroundings. The importance of improving cooperation of sociology and forest sciences for forestry management needs more efforts. Silence due to an underground economy does not help the safeguard of truffle heritage, which, though a renewable resource, is tied to a complex and vulnerable forest ecosystem. Silence nevertheless enhances the abuses by illegal hunters who are used to prey upon the forest. We can confirm that the area of study is an ecosystem that changes and grows constantly with a collection of truffles compatible and respectful of biodiversity. Multivariate analysis (MVA) of the data would suggest good reasons for more investigation on soil and partly confirm the mythical mind of the truffle hunters. Key words: biodiversity; truffle; forestation; cultivar. Parole chiave: biodiversità; tartufo; forestazione; cultivar. Citation - Meoni A.M., Imola P., Biondi F., 2012 – A database on truffles diffusion on forestation plot: the contribution to biodiversity by forest ecosystem. L’Italia Forestale e Montana, 67 (3): 263-272. http://dx.doi.org/10.4129/ifm.2012.3.04 1. Introduction The truffle crop is an empirical practice based on traditional conviction as truffle hunting does (Granetti, 2005). We wanted to start a trial to study the mystery tied to truffle finding in aim to check if the traditional convictions are in some way connected to scientific theory and experimental of the truffle cultivation. On the other hand, the underground economy needs more fiscal rules in order to improve collection of data of truffle productivity. The introduction of rules to extend the tax base by reducing avoidance and tax evasion has been a long term topic in the Italian Parliament (Fiorio, 2009; Carlucci, 2008). The scientific reports on the amount of wild truffles harvested by spot of sample areas can’t explain the “where, how and when” on all the land (Salerni, 2010), the same to determine soil characteristics (Gardin, 2005). Predicting truffle production based on forest site characteristics is required as happens in the mushroom situation (Palahì, 2009). The “know how” in the truffle debate mainly – L’Italia Forestale e Montana / Italian Journal of Forest and Mountain Environments © 2012 Accademia Italiana di Scienze Forestali 67 (3): 263-272, 2012 doi: 10.4129/ifm.2012.3.04 264 a.m. meoni et al. comes out only by specific silviculture for truffle production (Bencivenga, 2000; Bonet, 2009; Raggi-Vivai, 2011; Di Massimo, 2005). The study of biodiversity itself is a complex technical problem of objective observation, but also a reflection of the dynamics acting in the interdisciplinary approach. The concept of complex adaptive system has to be analyzed within the current theoretical and operational debate in silviculture and forest management area (Nocentini, 2011). The body of knowledge from different disciplines require a psychological semeiotic of complexity to ensure a multidisciplinary approach to a complex adaptive system such as the forest is and the man who inhabits it (Di Cesare, 2011). The social policy, forest and economics, demand more attention to non-timber products and its own scientific methods and managing results (EFIMED, 2007; Rete Rurale Nazionale, 2011). In the real situation, discussed in this paper, there is a new component, which influences, the degree of performance of the working dog and, consequently, the amount of truffle collection that depends not only on the performance of dogs’ sense of smell, but also by the dynamics that dogs have with the environment: people and other dogs that day. The dynamics that interdisciplinary cooperation raises support “dynamic group of organizations” (Meoni, 2004) and are described in particular about truffle gathering in a previous report (Meoni, 2009). The “Nocella” forestry farm has run an assessment of the symbiotic plants and the truffle quarries of a new forestry ecosystem, developed on former fields traditionally cultivated, and has collected detailed data of truffle production and diffusion over 10 years. In 1988 the “Nocella” rural farm changed into a forestry estate, helped by the set aside PAC benefits which help forestation of rural fields. In 1988 the mountainous district administration Comunità Montana started a forestation plan with the approval and courtesy of the owner. In the new resulting forest truffle species grew spontaneously. In ancient time the area was backwoods. The rural socio economic development which followed was connected to the traditional home farming. The area has ifm lxvii - 3/2012 been slowly deforested, terraced, planted again and cultivated. At that time, the seeds were selected by chance experiments on sustainable agriculture, based on biodiversity (Biscotti, 2010). The new forestation process brought back the old times, but still conserved memories of plants (cultivar) and even introduced some non native species. A peculiar biodiversity naturally occurred and resulted with truffle symbiotic plants and truffle production. The list of species and relevant soil site data are reported in Table 1. After the final planting test (2001), the Regional Government has admitted the resulting backwoods as Controlled Truffle Ground n.15 of the Umbria Region. Sorry Table 1 – Qualitative and quantitative description of soil and of forestry characteristics. site condition rilevant data Planting time Spring 1989 Area 14.09 ha Forestry species Pine and Cedar, Oak, Alder, European Mountainash, Walnut Plantation Ball planting Thinning 1998 (7.0 ha) PruningNone WateringNone Borders Backwoods (N/S); fields set aside (E/O) Truffle species Aestivum; brumale; uncinatum, borchii; rufum; excavatum; indicum; balsamia vulgaris; genea fragrans Cultivar species Olive, vine, fig, mulberry, cherry, apple, pear, plum, poplar cultivar Niche ecological Ornamental liliaceae, broom, hornbeam, bramblebush and bramblerose, herbs, strawberries Wilde animals Wild boar; roe deer; fox; squirrel; badger; woodcock; viper Altitude m 545-490 Aspect South East Slope range 5% - 30% Soil formation Pliocene Sabbie gialle Area climate Moist, first mesothermal, thermal efficiency of 53.2% (formula climate: B1 B1's b3') Soil condition Inceptisols-Entisols Soil texture Sandy-fine (FS) send clay loam (SCL) Soil classification Typica Xerorthents and Lithic Xerorthents Source: data from land survey study area. a database on truffles diffusion on forestation plot to say however that since October 2010 the environmental protection of this truffle grounds ended with the sole responsibility of the local department of Comunità Montana no thanks to the new Federal Regional policies with the only aim to acquire more votes instead of promoting educational policies for a sustainable forest management. As a matter of fact the action of the forest administration is not carried out aimed to protecting the forest and conserving biodiversity. The range of this site study represent a new forest ecosystem of high complexity. Nocella Forestry Farm ran the truffle grounds from October 2001 to October 2010 with its first aim to mark and define the localization of symbiotic plants and collect a detailed daily report of the amount of truffles gathered. The site has been an open site: free entrance to wild animals and ruled entrance to hunters during the study here presented. The site can be found on a hill west to the mountains between the fertile valleys of the Chiani, Paglia and Tevere rivers (Umbria - Italy). 2. Methodology Ten hunters were selected from a call extended to 80 truffle hunters. It took a lot of experimentation with different techniques to add substantially a new task to the normal activity of finding truffles: the task to annotate, mark and record. It took many meetings and different social experiences to motivate searchers to a task that did not show immediate results and to stimulate dialogue and cooperation. Eventually the group has established itself as a reliable group in data collection. In the formation and management of the group were applied the rules of group analytic technique to groups task orientation. The task sharing in the team of hunters and researchers introduced to connection troubles regarding language, alliance and mirroring ambivalent feeling. The working team grew slowly with many changes. After many difficulties the group has been working happily and seriously with great motivation for many years. It was not easy to solve problems connected with putting into practice the ex- 265 perience of noting information during truffle hunting. Technical demand in gathering data and technical demand in gathering truffles are not similar. Gathering truffles is a speedy activity lead by an excited dog. Data collecting is a quiet thoughtful activity, truffle gathering is an operative activity. The hunter hand and mind have to cooperate at different speed. Defining permanent methods to mark symbiotic plants was not often successful. Visible marking were difficult to have due to the weather conditions and other natural elements. Signals lost, fallen to the ground, were renewed and errors cannot be excluded. The signals required constant maintenance and updating for predictable deterioration or unpredictable actions of intentional interference (some illegal disruptive hunters eliminated cartels) or animal interference (the squirrels gnawed the ropes of plastic signals and made them fall, perhaps as a joke). It was not always possible to guarantee the maintenance of numbers assigned to symbiotic plants and in some cases the basic data in detail have no precise references (records in albums as “T without number” or “?”): no relevance to the percentage at statistical analysis of the data in detail (Tab. 2). The recognition of symbiotic plants and their identification on site has been processed in stages as follows. We started by marking the plant we can identify by its natural exterior natural marks suggesting the presence of truffles. Once the presence of truffles was confirmed the plant was labeled and numbered. The plant close to Table 2 – Three-year period (2008-2010) total truffle productivity and percentage corresponding to plots of coniferous and deciduous. Plot Species increasing PlantsTruffles Index Deciduous 202 plots 62.60%62.80%100.30% Coniferous 104 plots 27.40%33.60%122.70% Not known 10.00% 33 Source: our elaboration of primary data. 3.60% 35.70% 266 a.m. meoni et al. the truffle findings was said to belong to that particular symbiotic plant. From spring 2008 to autumn 2010 the daily truffle gatherings around the labeled plants were collected and separated in numbered bags. Unlabelled plants with new truffle presence were marked in the same way. At home the weight of the bags were registered, stating the number of truffle found, the hunter and the dogs cooperating in the hunt. The collected data on the albums are actually the Nocella forestry estate database reporting the truffle daily productivity of every symbiotic plant during 2008-2010 gathering seasons. The data in the album have been registered in a system creating three database on an excel program reporting the day, the plant number, plant species, dogs and hunter name and the amount of truffle gathered. The database was processed by statistical analysis MVA and the results were then related to the soil characteristics. The plant symbiotic from the samples on site were transferred to the map with the aid of aerial photography with better accuracy than GPS counting the rows of the system which is allowed by the arrangement leopard spots of the different species easily seen in aerial photography and with the help of many landmarks (Meoni, 2011). The stations for soil sampling from the samples on site were even located on map by GPS coordinate. Based on morphological conditions of the soil 6 stations for soil sampling were chosen, casually close to 6 symbiotic plants (Fig. 1). The sampling was carried out by taking the land from each station at depths between -10 and -30 cm below the surface. On each soil sample collected various chemical analyses were preformed. In addition, we calculated the following parameters: water pressure (Riu) and deficit irrigation (DI). The particle size analysis was performed for the fraction silt and clay, with the densimeter wet, after dispersion with sodium hexametaphosphate, while the sand fraction was determined by sieving. The pH was performed in water with soil/water 1:2.5. The organic matter was calculated indirectly by means of total organic carbon analysis of the attack with sulfuric acid and potassium dichromate, then multiplied by the organic factor. The useful water reserve ifm lxvii - 3/2012 was calculated by the method of Saxton as a function of particle size (Saxton, 1986). The water deficit was determined for each station using the Thornthwaite water balance of the soil (Thornthwaite, 1957) (Tab. 3). The statistical analysis of data (Rizzi, 1992) was here conducted first for each year and subsequently for all the three years observed in order to give greater consistency, stability and statistical significance in any analysis. Most of the phenomena observed for a single year were confirmed on the total of three years. One exception is the year 2008, being the first year of data collection, probably, as mentioned earlier, still suffers from the subjectivity of the seekers in choosing methods and collection days. A statistically non-relevant data of trees has remained non-coded with regard to the species. This percentage is for all the three years around 10% (2008 primarily it goes to 16% and is much lower in the years 2009 and 2010). The correlation coefficient Pearson ρ has been applied to verify the existing relationship between each characteristic found in the soil and truffles productivity (Tab. 2) at the station pedon (Fig. 1) and between the other stations (Fig. 2). 3. Discussion The data collection concerns the truffles actually found and not all the truffles in this woodland, because variable factors (subjective emotion of the moment and the overall situation of the relationship and different abilities of dogs and hunters) can’t be eliminated. The database therefore does not represent the actual amount of truffles of those symbiotic plants, but only the amount of the “here and now” those people and not “others” were able to find. The figures, however, may be related because the actors of the research (hunters and dogs) are the same throughout the experiment lasting three years. The cycle term of the experiment may be too short (inappropriately interrupted) considering the lifetime of the natural cycles, however, is fairly indicative. We hope to stimulate further research more guaranteed over time. Early results are separate aspects of a complex system a database on truffles diffusion on forestation plot 267 Figure 1 – Locations for soil sampling. Table 3 – Chemical and physical analysis of soil of the six stations layer sampled (about 20 cm, including the AB horizons and AC horizon). Average texture (tex): franc-sandy-clayey (FSA), with a total amount of sand about 55% and clay that ranges between 18% and 23%. Samples Sc Sf St L C Tex.DenpHS.O.RiuD %%% %%Kg/dm3 %mm mm 1 2 3 4 5 6 12.844.056.8 24.918.3 10.844.855.6 24.819.6 10.446.456.8 20.223.0 14.041.655.6 22.322.1 17.236.453.6 26.420.0 15.238.854.0 23.622.4 FS 1.45 FS 1.44 FSA 1.42 FSA 1.43 FSA 1.43 FSA 1.42 7.3 7.6 8.0 7.8 7.2 6.0 4.0 1.1 0.8 0.7 0.9 1.8 111.7 177.1 87.1197.4 80.6205.1 84.1199.0 91.5191.7 95.7187.1 268 a.m. meoni et al. ifm lxvii - 3/2012 Figure 2 – Trend percentage of clay in the soil samples and truffle productivity. It can be seen that at higher values of the percentage of clay match the lower values of productivity. There exists a negative correlation (as shown on the sign of ρ Pearson reported in the table). The regression line drawn, which describes the linear model is downward sloping (variables differ). Source: elaboration of our primary data. interrelated to the truffle amount collected during the summer seasons in the course of three years (the data submitted refer only to black truffle). The conduction of an operative team of truffle hunters whose aim is collecting data is quite unusual. There are no similar research findings noted in this reference. Due to damaging of the quarries by the illegal hunters the “where about” is a secret. The tradition is not to say where and when truffles are found. The truffle hunt is a very complex activity having need of people and dogs, therefore only by a directive group activity a real census of all the symbiotic plant in a defined area can be achieved. For at least 3 years we collected precious information in productivity change (Tab. 2). The operating cycle of wild truffle hunting is damaged by the illegal hunters who use spades instead of dogs thereby destroying the ecosystem without knowing that truffles are an important non-wood product strictly related to biodiversity. Professional and technical difficulties emerged while investigating and describing biodiversity especially if the members of the team belonged to radically different cultural backgrounds (Meoni, 2009). We tried to test correlations with known variables such as traditional beliefs about the influence of the lunar cycle or soil analysis (Fig. 2 and Fig. 3), the truffle diffusion and steady amount of the increase of symbiotic plants (Tab. 2). The experimental non fenced area suggests the role of wild boar, much feared by truffle hunters as predators, to ensure the renewal resource (Salerni, 2010). The new moon influences the maturation of the truffle (Fig. 3): a highlight which requires a specific protocol to be tested on the different abilities of dogs and 2008 Figure 3 – Average production (kgs) of truffles during moon phases in the three years analyzed (20082010). Source: elaboration of our primary data. 2009 2011 a database on truffles diffusion on forestation plot hunters. We recall here that the maturation of the truffle with the release of the perfume is the first and only reason for which the dog finds the truffle and that the moon calendar is the popular biological calendar. The anthropological cultural beliefs about the effects of “moon phases” on human activities in agriculture, as sowing, harvesting, pruning, handling or storage of products, is radical even not scientifically proved. The popular perception of the influence of lunar phases on the maturation of the truffle produces behavior resulting in the collection habits according to the change of the moon mainly during the fourth period before the new moon. The strength of magnetic attraction that the Moon exerts on the earth’s crust it is tested, most evident in the aqueous component (tides), especially in the days of New Moon and Full Moon. The statistical averaging in this study confirms the traditional belief of the influence only in the day of new moon: in each year of the whole of three years the day of collection corresponding to the new moon is on average more productive than others. The increase in average productivity during the new moon is related to the increase of the absolute production of the entire plant (Fig. 3). The two phenomena appeared to be positively correlated and the increase of one corresponds to a similar increase of the other. In this respect it should be specified that in the analysis of data were considered the actual day of the new moon (new moon entered the evening at 23.30) means that the actual collection day of new moon is the following day to that of the calendar. The production seems to be “messy” and casual for the duration of the lunar cycle except at the new moon. Statistical analysis of data denies, however, the popular belief according to which the production would be also higher throughout the last phase of the waning moon and the first three days of new moon (socalled first quarter). The popular belief was so strong that it was not easy to get used to collecting the truffles methodically, for scientific reasons, regardless of the lunar cycle, because, to save time, they would prefer to hunt, as they are accustomed, during the waning moon and first quarter. This statement is supported by the 269 fact that in 2008, the first year of data collection method, however, the collection of the full moon day is lost. We have also linked the numeric variables that indicate the composition and characteristics of the soil samples pedon with the productivity of the plant in the sampling station. The organic matter tends to be low, is somewhat more abundant in surface horizons for a greater accumulation of leaves. The water supply is greater in station 1, because, being a colluvium, the ground is deeper and more sandy, the other stations are almost identical and are between 80 and 95 mm. As the water deficit (determined by the soil water balance for each station) is greater in the n.3 station, which is located at a lower altitude and exposed to the South (Fig. 1, Tab. 3), some samples station, in one case n.6 coincides with symbiotic plants that have begun to be productive only in recent years. Once calculated the values of the coefficient Pearson ρ for each feature highlighted by the sample, where this indicator had noted the existence of a correlation not negligible, we proceeded to the linearity tests using the Fisher’s F statistic to see if such a linear correlation was statistically namely to test whether the significant relationship between the two variables was linear (Fig. 2). Since the random sampling of the ground pedon was not in relation the productivity of the plant, but addressed to define the different characteristics in the soil, it is clear that the issue should be further explored with target samples to detect differences in relation to plant symbiotic (or quarries areas).The index of correlation (Pearson’s ρ), which varies between -1 and 1, can tell us as a function of X, if Y varied and in what manner if given two variables, one independent of X (soil pH, percentage of clay, sand, organic matter contained in the soil, bulk density, etc.) and other dependent on Y ( truffles on the turf from which the soil sample was taken). If this index assumes a value of 0 means that the two variables are unrelated and therefore vary independently of one another, when this index was equal to 1 there would be a perfect linear correlation between two variables that say agree (of one increases the other also increases), then 270 a.m. meoni et al. if the index takes the value -1, we are facing a perfect negative linear correlation like for clay in our studies (Fig. 2) This means that the variation of the variable X, Y varies in the opposite direction (if one increases the other decreases) and the variables are said to differ. All other cases indicate intermediate levels of correlation, strong or weak depending on the value of ρ is close to 0 or -1. 3. Results The map of symbiotic plants followed for six years from 2004 to 2010 shows a gradual increase in productivity that is almost doubled from 2008 to 2010. We can’t exclude that the increased focus on operational research program in 2008, when the collection was introduced to the retail plant by plant, has encouraged the more accurate identification of the symbiotic plant. The data, however, agree in ifm lxvii - 3/2012 the course of three last years because there was an increase both in the symbiotic plants number and truffles collected (Tab. 2). The map of the quarries (Fig. 4) presents plants related to the previous area’s traditional crop (cultivar) suggestive of a correlation between cultivars and “cave” (slang term that corresponds to the concentration of plants in a symbiotic area). The quantity harvested also varies indirectly proportional to the number of dogs present in the area simultaneously: note that it requires further testing and a special ethological approach. The quantity harvested on days of new moon is for statistical analysis (MVA) consistently higher than that collected in other phases of the moon (Fig. 3). The chemical-physical analysis of soil explored in the six stations (Tab. 3) in general confirms the well-known compatibility of the truffle with some reactions of the soil, (Bencivenga, 2000; Bonet, 2009; Di Massimo, 2005; Gardin, 2005; RaggiVivai, 2011) but we cannot ignore that the Source: Meoni.A.M. poster session congress Romaforest2011. Figure 4 – Aerial photography of “Nocella” forestry farm (detail): map showing the areas with a maximum density of truffle quarries (marked with closed circles) and the location of the cultivars/ ecological niches joined with truffle quarries (marked by descriptive notes). a database on truffles diffusion on forestation plot overall figure is seemingly contradictory because it shows more productivity of coniferous (Tab. 2) responsible for soil acidification: surely we need additional testing on this point. The chi-square test (χ2) was conducted to verify any dependency between the different productivity of deciduous/coniferous trees and soil parameters of the championship. The results suggest more investigation on this point. The small sample size makes it impossible to find a relationship between the productivity of the soil and the characteristics of tree plantation on pedon. What we see, in the map we draw, is the increasing number of new plant symbiotic. The evidence of localization of the cultivar still present from former rural growing can be seen by the map of the areas of symbiotic plants (Fig. 4) (Meoni, 2011). 4. Conclusions and perspectives The map drawn of the symbiotic plants have shown evidence of new symbiosis coming out each season, apparently not related to former method of forestry control such as thinning, for example, which must be considered an external environmental threat to biodiversity. The map we draw of the quarries also show a progressive enlargement and confluences of the areas of productivity which can be related to excrement or droppings of wild animals and birds, as well as the localization of the former cultivar (Fig. 4, Tab. 1). We can confirm that the area of study is an ecosystem that changes and grows constantly with a collection of truffles compatible and respectful of biodiversity (Tab. 1, Tab. 2, Fig. 4) Multivariate analysis (MVA) of the data would suggest good reason for more investigation on soil and partly confirms the mystic minded beliefs. The traditional hunters’ beliefs remain an element of truth. We must recognize that once past the first operational difficulties of collecting data, the complexity of the problem presented to us results from many variable factors. When studying the forest system in relation to truffles, our findings must be studied applying various interdisciplinary semeiotics includ- 271 ing even the mythological mind of the truffles hunters. The underground economy has influenced scientific research on truffles to satisfy their material gain without giving insight or support to the “real” situation. During our trial, once the “silence” governing the collection of truffles had been broken, we were able to collect many and varied information. The many variables can frighten and discourage the scientific approach, but must not be ignored for they are primary cause of life preservation. Unfortunately we verified that the underground economy doesn’t preserves life conservation and forest ecosystem only material gain. Acknowledgments Due thanks to Miss. Teresa Avenia (teresa. [email protected]) who with enthusiasm gave the English mother tongue touch to the report. Sincere thanks must be given to all the proud, qualified and motivated truffle hunters of the cooperating team who made this research possible: Mr. Massimo Parrini, Mr. Franco Muccifora, Mr. Silvano Nuccioni, Mr. Valentino Mezzoprete, Mr. Michele Serranti, Miss. Jasmina Rubick and Miss. Anna Maria Meoni and their own skilled friendly dogs named Camilla, Dolly, Alice, Zago, Professore, Briciola, Pallini, Zara, Bubi, Kingo, Betty, Passy and my lady Elisabetta. RIASSUNTO Una raccolta di dati sulla diffusione dei tartufi in un impianto forestale: il contributo alla biodiversità dall’ecosistema forestale L’azienda forestale “Nocella” (Ficulle, Umbria, Italia) presenta un database della produzione spontanea di tartufi che segue l’imboschimento di terreni precedentemente coltivati con colture tradizionali. Il contributo spiega i punti critici e i limiti che si incontrano nell’individuazione delle piante simbionti e dei siti di estrazione dei tartufi. Vengono riportati alcuni dei primi risultati dell’Analisi Multivariata (MVA) condotta sui valori di database e sulle analisi dei suoli così come viene presentata la mappa dei siti di estrazione del tartufo, delle cultivar e delle piante forestali. I prodotti forestali non legnosi come il tartufo hanno conseguenze agroforestali sulla conservazione della biodiversità di tipo sia teorico che operativo. La diffusione dei dati di dettaglio sulla produzione del 272 a.m. meoni et al. tartufo non è cosa comune, anche se rappresenta un obiettivo scientifico importante che permetterebbe di completare la comprensione dell’intero ecosistema. L’economia “sommersa” del tartufo e le convinzioni antropologiche sono, in più, elementi di contorno molto ostili. è importante migliorare la cooperazione tra sociologia e scienze forestali per la gestione delle risorse forestali, ma questo richiede maggiori sforzi. Il silenzio connesso all’economia sommersa non aiuta a salvaguardare il patrimonio tartuficolo che, essendo una risorsa rinnovabile, è connesso ad un complesso e vulnerabile ecosistema forestale. Il silenzio senza dubbio accresce gli abusi dei raccoglitori non autorizzati che normalmente operano in bosco. Relativamente al caso studio, si può confermare che l’area rappresenta un ecosistema che cambia e cresce costantemente con un grado di raccolta dei tartufi che è compatibile e rispettoso della biodiversità. L’analisi multivariata (MVA) dei dati suggerisce buone ragioni per maggiori indagini sul suolo e conferma in parte le credenze diffuse tra i raccoglitori di tartufi. REFERENCES Bencivenga M., 2000 – Risultati produttivi di tartufaie coltivate di Tuber melanosporum Vitt. in Umbria. Micologia Italiana, 2: 38-44. Biscotti N., 2010 – Frutti dimenticati e biodiversità recuperata. ISPRA, Quaderni-Natura e Biodiversità, 1/2010. 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