东风镇小流域综合治理效益研究

<正> 一、流域基本概况 黑龙江省海伦县东风镇小流域,总面积116平方公里,土壤为黑土。1971年全流域水土流失面积54.7平方公里,占总面积的47.1％,其中坡耕地流失面积35.13平方公里,占总耕地面积的47.9％。全流域年流失土壤量为29.3万立方米,坡耕地上年剥蚀土层厚度为0.55厘米。粮食亩产由初耕期的150～200公斤下降到50～100公斤,有的年份不足50公斤。流域内的生态环境逐步恶化,自然灾害频繁,森林覆被率下降为3.4％,野生禽兽几乎绝迹。

Study on effect of comprehensive soil erosion control in Dongfengzhen small watershed

Dongfengzhen small watershed was chosen as a test plot to study soil erosion control in chernozem by Bureau of Water Conservancy of Heilongjiang Province in 1971.Compre-hensive control measures have been taken for years and proved efficient,these are as follow: annual runoff reduced by 92.5% and annual sediment yield by 96.4%, soil fertility increased distinctly, micro climate and ecological environment improved. This test plot has presented some helpful experiences in soil conservation and agricultural development in the chernozem region.