Chang X, Zhao H, Yang C, Xu J
Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000.
Ying Yong Sheng Tai Xue Bao. 2000 Jun;11(3):395-8.
The relationship between species diversity indices and sandy grassland productivity was studied in Kerqin sandy land, and the results showed that the relations could be divided in to two categories based on the indices and productivity. The first type includes function and composition diversities, their maximal biomass varied form 299 to 336 g.m-2, and had a simple linear relation with the productivity. Their correlation coefficient was remarkably significant. The species richness and Shannon-Wiener indices attribute to second type, their maximal biomass varied from 426 to 433 g.m-2, and had a complex parabola relations with the productivity. Their correlation coefficient was also significant. Meanwhile, the grey correlation analysis showed that the species composition diversity index was the most important factor that influences productivity. According to the grey correlation degree, the order of the different indices affecting productivity was: composition diversity(0.74), function diversity (0.72), species richness (0.66) and Shannon-Wiener index (0.14). It is suggested that increasing plant species richness (species introduction) and consequent composition diversity could be the practices of improving the degraded grassland in Kerqin.
在科尔沁沙地研究了物种多样性指数与沙地草地生产力之间的关系，结果表明，基于这些指数和生产力，二者关系可分为两类。第一类包括功能多样性和组成多样性，它们的最大生物量在299至336 g·m-2之间变化，与生产力呈简单线性关系。它们的相关系数极为显著。物种丰富度和香农-维纳指数属于第二类，它们的最大生物量在426至433 g·m-2之间变化，与生产力呈复杂的抛物线关系。它们的相关系数也很显著。同时，灰色关联分析表明，物种组成多样性指数是影响生产力的最重要因素。根据灰色关联度，不同指数对生产力影响的顺序为：组成多样性（0.74）、功能多样性（0.72）、物种丰富度（0.66）和香农-维纳指数（0.14）。建议增加植物物种丰富度（物种引入）以及随之而来的组成多样性，这可能是改善科尔沁退化草地的措施。
