三峡库区农林复合生态系统植物物种多样性指数

三峡库区农林复合生态系统物种多样性simpson指数为1．02～11．2，shannonwiener指数为0．10～3．87，物种丰富度S为6～23，海拔及坡向对物种多样性有一定的影响；坡度变化对物种多样性影响不大；农林复合经营结构对生物多样性有着较大的影响，柑桔种植类型通过复合经营物种丰富度S提高1～2．2倍，simpson指数提高72．5％～150％，shannon－wiener指数提高1．3～2．3倍；生物地埂、生物带对物种多样性影响显著，生物多样性的提高，增强了防止土壤侵蚀的效能，提高了土地生产力。

Study on Planntation Species Diversity Index of Agroforestry Ecosystem in Three Gorege Reserior Area

The simpson species diversity index of agroforestry ecosystem in TGRA is 1.02～11.2, the shanner-wicncr index of it is 0.10～8.87, and spcies Richners is 6～23.The altitude and aspect have certain impact on spcies diversity,the change of slope has little one on it.and the structure of agroforestry system has great one on it. By agroforestry management,the spcies abundance in type of orange planting can be increased 1 to w. w time,the Simpson index 72.5%～l50%,the Shanner-Wiener index 1.3 to 2.3 times. Biological band and belt take great influence on biodiverstty. The improvement of biodiversity can effectively control soil erosion and improve soil sroductivity.