基于GIS的河西走廊灌溉农业区耕地地力评价研究  ———以甘肃省肃州区耕地地力评价为例

EVALUATION OF FARMLAND PRODUCTIVITY IN IRRIGATION AGRICULTURAL REGION OF HEXI CORRIDOR IN GANSU PROVINCE BASED ON GIS TECHNIQUE-A CASE STUDY OF SUZHOU COUNTY

关键词:  GIS 耕地地力评价 层次分析 模糊数学 河西走廊灌溉农业区 肃州区

Key words:  Geographical information system  Farmland productivity evaluation  Analytic hierarchy process  Fuzzy mathematics

摘要:

应用GIS技术，结合层次分析法和模糊数学综合评价方法等现代统计分析技术，以甘肃省肃州区 为例，对河西走廊灌溉农业区耕地地力进行综合评价，研究其影响该区域耕地地力的主要指标。结果表明， 影响该区域耕地生产潜力主要指标顺序依次为:剖面构型>障碍层位置>质地构型>灌溉保证率>土体含 盐量>有机质>有效土层厚度>海拔高度>障碍层厚度>有效磷>灌溉模数>土壤侵蚀程度>速效钾。肃 州区耕地地力等级可分为四等，一、二、三等地占的比例较大，分别为36.1%、37.2 %和21.6%，占总耕 地的94.9%，四等地占的比例较小，为5.1%。与国家耕地地力等级对比，肃州区一至四等地，分别对应 国家三至六等地，因此，该区域耕地生产能力普遍较高。

Abstract:

Farmland productivity in Hexi agricultural region of Gansu Province was systematically evaluated， using a method integrating Geographical information system（GIS） with modern statistical analysis such as analytic hierar- chy process and fuzzy mathematics. Taking Suzhou County as study area， this paper comprehensively evaluated the farmland productivity and the main impact factors. The results showed that the factors impacting farm land produc- tivity in descending order were soil profile pattern， position of obstacle layer， soil texture pattern， irrigation effi- ciency， soil saltiness， organic matter， soil layer thickness， altitude， soil obstacle layer thickness， available phos- phorus， drainage modulus， soil erosion degree， available potassium. The farmland productivity in Suzhou County can be divided to four grades， of which the area of grade 1（the best farmland）， grade two， and grade three ac- counted for 36.1%， 37.2%， 21.6% of the total farmland area， respectively， while the grade four（the worst farmland） only accounted for 5.1%. Thus it concluded that the farmland productivity was generally high to support the sustainable development of agriculture in the region.