黄土高原水土保持功能的重要性评价与分区

Importance evaluation and regionalization of soil and water conservation function in Loess Plateau

根据黄土高原生态环境特点和水土流失现状,选择水源涵养、土壤保持、蓄水保水、防风固沙、防灾减灾以及农田防护等水土保持功能进行评价。在此基础上进行黄土高原水土保持功能重要性综合评价,评价结果表明:黄土高原地区水土保持功能均处于中等重要以上;其中极重要地区比例最大,占全区面积的80.03%;中等重要地区较少,占全区面积的19.97%。最后根据6个单因子功能重要性评价结果,利用ArcGIS中的空间分析叠加功能,确定黄土高原水土保持功能区划的基本界线,将黄土高原划分为9个水土保持功能区,并提出黄土高原各区的生态保护方向,促使自然生态系统更有效地支持社会和经济的发展,为改善黄土高原生态环境质量奠定基础。

According to the characteristics of ecological environment and soil and water loss situation in Loess Plateau, the importance of soil and water conservation function was comprehensively evaluated, based on the evaluation of water conservation, soil conservation, water storage, sand-fixing, disaster prevention and mitigation, farmland protection and other service function. The results show that soil and water conservation function in Loess Plateau was of importance. 80.03% and 19.97% of the total area had the service function with high and medium importance, respectively. According to the evaluation results of importance of six single factor function, using overlay function of spatial analysis in ArcGIS, the basic line of division of soil and water conservation function in Loess Plateau was determined. The Loess Plateau was divided into nine division based on soil and water conservation function, and the direction of ecological protection was put forward for each division, so as to promote the the economic and social development with more effective support of natural ecological system, and lay the foundation for the improvement of the eco-environmental quality of Loess Plateau.