贵州省退耕还林紧迫性地域分级与退耕策略

退耕还林是治理贵州省水土流失的有效措施,科学分析陡坡耕地的数量,尤其是分析陡坡耕地占一定区域国土面积的比例,是制定退耕地还林战略实施的重要依据。在深入分析贵州陡坡耕的现状及影响因素基础上,提出以陡坡耕地占区域国土面积比例作为退耕还林紧迫性的指标,将全省82个县(区、市)的退耕地还林紧迫性分为7级3类,提出贵州省实施退耕还林的战略是占全省国土面积56.63%的极重点退耕类型区和重点退耕类型区,从而可实现全省75.39%陡坡耕地退耕。同时,提出了林种结构配置比例的原则。

Grading Region of Urgency Returning Farmland to Forest and Its Strategy in Guizhou Province

Returning farmland to forest is an effective measure to control soil erosion in Guizhou Province.Analyzing the quantity of the slope farmland,especially the proportion of farmland to the territory area,is an important foundation for making the strategy on the returning farmland to forest.On the basis of probing into the present situation and factors of slope farmland,this study classified the 82 counties into seven levels and three categories,taking the proportion as the urgent index of returning farmland to forest.The important region was found to be the region of the utmost key type and the key type of returning farmland,which covers 56.63 percent of the territory of the whole province.Therefore,it may achieve 75.39 percent of slope farmland to forest.As the same time,this paper presents the principle of the ratio of the grove species deployment.