植物种多样性对生态系统功能的影响

采用8种1年生植物,利用室外盆栽方法构建的植物群落对物种多样性与群落生产力、杂草入侵性之间的关系及其潜在的作用机理进行了研究.结果表明,各物种单播时其生产力和抗杂草入侵能力都有较大差异.物种多样性与群落生产力之间不存在线性关系,而呈现单峰格局关系,即在一定范围内(本研究为4种),物种多样性对生产力增加有促进作用,超过该范围,物种多样性增加,群落生产力不再增加.但群落生产力和物种多样性均与杂草入侵量之间呈显著负相关关系.相对产量总和(RYT)分析表明,资源互补效应是本研究中所观察到的多样性-生产力、多样性-入侵性及生产力-入侵性关系的主要作用机理.

Effects of Plant Species Diversity on Ecosystem Function

The Plant community from out-door pot experiment was constructed to study the relationship of the diversity,productivity and invisibility,as well as the possible mechanisms with 8 annual species.The results indicated that monocultures varied greatly in their productivity and weed invasibility.No linear unimodal pattern was shown between plant species diversity and community productivity.It suggested that in a restricted range,productivity enhanced by the species diversity increasing,but no more change when the species were up to 4.There were significantly negative patterns among the diversity,invasibility,productivity and invisibility.The RYT analysis revealed that the resource complementary use was one of the important mechanisms to evaluate the relationship among diversity,productivity and invasibitiy.