其他知识库

Amanita masasiensis is an edible ectomycorrhizal fungus widely harvested in Benin for its socioeconomic importance. However, its natural production and response to climatic variations remain poorly understood. This study aims to assess the natural production of A. masasiensis in the Soudano-Guinean woodlands in relation to vegetation and microclimate. For this purpose, three permanent plots (2500 m2 each) were established in vegetation types dominated by Isoberlinia doka, I. tomentosa, and Uapaca togoensis. The natural production, measured as the number of fruit bodies and fresh biomass, was assessed through twice-weekly visits to the plots during each mycological season from 2015 to 2019, with climatic parameters (air and soil temperature, relative air humidity, and soil moisture) recorded every 30 minutes. Seasonal and interannual production variations were analysed using time series curves and general linear hypothesis test based on linear models. The effects of vegetation type and site were assessed using generalized linear model with a quasi-Poisson family for the number of fruit bodies, and multiple linear model for the fresh biomass. The effect of microclimatic parameters on the number of fruit bodies was examined using the best-fitting generalized linear mixed-effects model with a negative binomial family, selected based on Akaike's Information Criterion. All statistical analyses were performed using R software. The results show that A. masasiensis production peaks in July and decreases in September, with annual fresh biomass ranging from 0.16 to 4.05 kg/ha. Site significantly affects the number of fruit bodies (P <0.01) and fresh biomass (P < 0.001), while vegetation type has no significant effect (P > 0.05), suggesting that the species fructifies across various environments. Air and soil temperatures, as well as relative air humidity, strongly influence production (P < 0.00001), with optimal conditions being 24.4 degrees C for air, 26.2 degrees C for soil, and 95.5 % for relative humidity. These findings improve the understanding of the ecological factors governing the production of A. masasiensis. They provide essential insights for predicting its yields and developing strategies for its sustainable management in tropical regions.