土壤微生物对植物多样性-生态系统功能关系的调控作用

宋威, 程才, 王嘉伟, 吴纪华

Soil microbes regulate the relationships between plant diversity and ecosystem functions

Song Wei, Cheng Cai, Wang Jiawei, Wu Jihua

图3 病原菌驱动植物多样性-生产力关系的3种假设。当病原菌对不同多样性植物群落的抑制作用相当时, 病原菌消失后植物多样性-生产力关系的斜率不变(A); 当高多样性的植物群落中某一物种占据主导地位时, 由于该物种相对多度较高, 导致病原菌对高多样性群落的抑制作用强于低多样性群落, 因此病原菌消失后植物多样性-生产力关系的斜率将会升高(B); 当病原菌宿主特异性和负密度依赖性发挥作用时, 病原菌对低多样性植物群落的抑制作用会强于对高多样性植物群落, 那么病原菌消失后植物多样性-生产力关系的斜率将会下降(C)。

Fig. 3 Three hypotheses on pathogen-driven plant diversity-productivity relationships. When pathogens exert equivalent suppressive effects on plant communities of varying diversities, the slope of the plant diversity-productivity relationship remains unchanged after the disappearance of pathogens (A). When a dominant species occupies a leading position in a high-diversity plant community, due to its relatively high abundance, the suppressive effect of pathogens on high-diversity communities is stronger than on low-diversity communities, thus the slope of the plant diversity-productivity relationship will increase after the disappearance of pathogens (B). When pathogen host specificity and negative density dependence effects function, the suppressive effect of pathogens on low-diversity plant communities is stronger than on high-diversity communities, then the slope of the plant diversity-productivity relationship will decrease after the disappearance of pathogens (C).