为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

[目的]探讨春秋场草地退化演替规律.[方法]群落特征和植被数量分析.[结果]春秋场草地退化严重,不同退化梯度间的多样性呈现一定的......

The results of an investigation carried out during June 2005 to May 2007 on physico-chemical parameters,species composit......