人工植被固沙工程系统稳定性的土壤微生物数量的初步分析

The Preliminary Analysis on Microbial Number of Ecosystem Stability in Artificial Plantation-fixed Sand Dunes

对腾格里沙漠东南缘包兰线沙坡头地区的人工植被固沙工程系统稳定性进行土壤微生物类群数量的研究，结果表明：１．不同年龄的人工植被沙丘的土壤微生物各类群数量均超过自然流动沙丘。２．３６龄和２８龄人工植被沙丘的土壤微生物各类群数量的垂直分布与自然被国家沙丘相比基本相似，从微生物各类群数量看，到目前为止，最长年限３６龄人工植被沙丘与自然植被固定沙丘相比，还没有达到最稳定程度，人工植被固沙工程尚处在演变过程。

aving researched on the microbial number of artificial plantation-fixed sand dunes of differ-ent ages on Shapotou area of the southeastern margiii of Tengger desert,we got the following re-sults1)microbial number in all artificial plantation-fixed sand dunes is more than that of naturalmobile sand duiie;(2)the vertical distributions of microbial number of the artificial plantation-fixed sand dunes of 36 and 28 years are similar to that of natural stabilized dune. Therefore itshows that the artificial plai1tation-fixed dune of 36 years is not stable enough and it is still underthe processs of evolution.