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......

对引滦输水工程上游水域进行了底栖动物种类区系组成、现存量(密度、生物量)及分布的调查研究.结合历史资料和国内相似水体研究结......

The abundance dynamic of some freshwater invertebrates in relation with the abiotic factors of the medium was studied fr......

Adjacent intensive agriculture disturbs the natural condition of wetlands.However, to assess the effect of this agricult......