fungal community

We found that the feeding of microbivores increases microbial necromass formation (analyzed by amino sugars). Acrobeloides sp. addition increased bacterial necromass accumulation by 3–9% through feeding mainly on Proteobacteria. Aphelenchoides sp. addition increased fungal necromass accumulation by 4–14% through feeding mainly on Ascomycota. A 25% wetter rain season decreased bacterial necromass accumulation by disrupting the feeding of Acrobeloides sp. on Proteobacteria. Rain season delayed for two months decreased fungal necromass accumulation by disrupting the feeding of Aphelenchoides sp. on Ascomycota. The functional traits of soil fauna, like feeding habits, directly affect the formation of microbial necromass under rainfall changes.

我们的研究表明，食微动物（microbivores）的取食活动可促进微生物残体（microbial necromass）的形成，该过程可通过氨基糖（amino sugars）进行分析测定。添加尖叶属线虫（Acrobeloides sp.）可使细菌残体积累量提升3%~9%，其主要取食偏好为变形菌门（Proteobacteria）；添加滑刃属线虫（Aphelenchoides sp.）可使真菌残体积累量提升4%~14%，其主要取食偏好为子囊菌门（Ascomycota）。降水增幅达25%的雨季会通过干扰尖叶属线虫对变形菌门的取食行为，导致细菌残体积累量下降；雨季延迟两个月时，则会通过干扰滑刃属线虫对子囊菌门的取食行为，致使真菌残体积累量降低。土壤动物群（soil fauna）的功能性状（如取食习性）会在降雨变化条件下直接影响微生物残体的形成。