黔中城市群不同石漠化等级的水源涵养功能

Water Conservation Function of Different Rocky Desertification Grades in Urban Agglomeration from Central Guizhou

为黔中城市群水源涵养功能的提高提供科学依据,选择黔中城市群为研究区域,以landsat8影像为基础,运用遥感和GIS技术,综合考虑植被覆盖度、土壤保持度、蒸发量、降水量、坡度和土地利用类型等影响水源涵养功能的因子,结合专家评定及层次分析法,研究不同石漠化等级的水源涵养功能。结果表明:2010年贵州省黔中城市群水源涵养功能极重要和高度重要区集中分布在东部和南部,中度重要区分布在河流水系发达地区,轻度重要区主要分布在北部,一般重要区集中在建设用地及其周边地区;在各水源涵养功能重要性区域中主要以轻度石漠化为主,极重度石漠化极少,且水源涵养功能重要性越高其区域内石漠化程度相对较低;但在各石漠化等级中,水源涵养功能重要性等级和石漠化等级并无严格线性关系,其等级间相互关系较为复杂。

In order to provide scientific basis for improving water conservation function in urban agglomeration from central Guizhou,based on the Landsat8 image and the urban agglomeration from central Guizhou as the study area, this paper uses remote sensing and GIS technology to comprehensively consider the factors affecting the water conservation function, such as vegetation coverage, soil conservation, evaporation, precipitation, slope and land use types, and combines expert evaluation and analytic hierarchy process (AHP). The function of water conservation was studied. Results: In 2010, the most important and highly important areas of water conservation function in urban agglomeration from central Guizhou were concentrated in the east and south, the moderately important areas were located in the developed areas of river system, the lightly important areas were mainly located in the north, and the general important areas were concentrated in the construction land and the surrounding areas. Important regions of water conservation function were mainly mild rocky desertification, and extremely severe regions were very few. The higher water conservation function, the lower rocky desertification grade was. There is no strict linear relationship between water conservation function importance grade and rocky desertification grade, but the relationship between them is more complex.