华北农牧交错带草原—农田群落空间演变机制的研究

Study on space evolvement mechanism of grassland and field community in ecotone between agriculture and animal husbandry in north China

研究结果表明 ,从农田—天然草地群落的空间演变表现出一定的规律 ,即植物群落可明显聚为三类 :农田群落、交错群落和天然草地群落 ;群落多样性指数 (香农 H′)、丰富度指数(R1、R2 )、均匀度指数 (E1 )及物种数量均表现出由低→高→低的变化规律。人类的频繁扰动 (耕作 )导致土壤理化性状的变化 ,作物的强烈生长又抑制了一些草原植物的生长 。

The research results indicate that: It shows a certain law that space evolvement from grassland to field community. All plant community can be clustered three kinds: field community、ecotone and grassland community; biodiversity index H′, Richess index R 1、R 2, evenness index and spices number all show a common change law from low to high then to low. The disturbance of human cause a change of soil, but the growth of grass was restrained by crop growth strongly this is the main reason for community evolvement from grassland to field. [WT5”HZ]