【摘要】 东北平原西部半干旱地区土地退化的形成是由其生态环境的脆弱性决定的。土地退化主要表现为土壤退化和植被退化 ,具有明显的区域分异性。从 2 0世纪初叶以来 ,近一个世纪的人类活动对东北平原西部半干旱地区土地退化起着重要作用 ,引起本区土地退化的主要原因是日趋强烈的土地开垦及放牧等人类活动对植被的破坏。对东北平原西部土地退化状况进行分析 ,反映出人类活动加剧情况下土地退化的基本情况。表 2 ,参 12。更多还原

【Abstract】 The land degradation was basis on the frangibility of eco environment in the western semi arid area of Northeast Plain.The major indication of land degradation are the soil and vegetation degradation which showed obvious area difference.Since 1900 the human action about one century play an important role for the land degradation.The major cause of the land degradation are the land reclaiming,depasture and so on which become stronger year by year.更多还原