甘肃省耕地质量等别特征与空间分布研究

RESEARCH ON ARABLE LAND GRADE CHARACTERISTICS AND SPATIAL DISTRIBUTION IN GANSU PROVINCE

关键词:  耕地质量等别 甘肃省 空间分布 特征 地统计分析

Key words:  arable land grade  Gansu province  spatial distribution  characteristics  geostatistical analysis

摘要:

［目的］摸清甘肃省耕地质量空间分布地区差异，整体把握全省耕地质量状况，以期为耕地保护策略制定提供参考依据。［方法］文章基于ArcGIS 10.0软件，以2015年耕地质量等别更新评价县级数据和省级汇总数据为主，采用克里格空间插值法研究了省域范围内耕地质量的空间格局，采用对比研究法、分类统计法分析了全省、各市州及各区域的耕地质量状况。［结果］（1）甘肃省存在4个中等质量耕地分布区域。自然质量等别、利用等别和经济等别下的中等质量等值区逐渐缩小：在陇南逐步向东南方向缩进，在河西走廊逐步由张掖向西北缩进，在兰州白银一带由带状区域缩小至零星区块； （2）全省耕地质量分布在8~15等，平均为13.1等，比全国耕地平均等别低3.1等； （3）各市（州）和各二级区耕地质量等别差异明显，中等地主要分布在河西走廊地区，低等地集中在陇东和陇中地区。［结论］甘肃省耕地质量等别总体偏低，基于耕地质量的耕地保护策略值得决策部门进一步关注，应持续研究耕地质量随时间的变化态势并在评价过程中考虑“土壤污染”因素。

Abstract:

To understand the spatial distribution regional differences and characteristics of arable land grade in Gansu province, by using ArcGIS10.0 software and arable land grade updating data of county level and provincial level completed in 2015, this article analyzed the spatial distribution through Kriging spatial interpolation method, compared the arable land grade from provincial, municipal, regional level through comparative and classification method. The results showed as follows: (1) There were 4 main intermediate grade levels in Gansu, the area with natural, utilization and economic grade gradually shrunk from south to southeast, from Zhangye city to north-westin Gansu corridor area, and from a belt-like region to a smaller area in Lanzhou city and Baiyin city. (2) The arable land grades ranged 8 to 15, with the average grade 13.1, which was 3.1 lower than the national average. (3) The arable land grades were obvious different among cities and land utilization regions. The intermediate grades area mainly distributed in Gansu corridor area, the low grade zone mainly distributed in the middle and eastern regions of Gansu province. It concluded that the arable land grade of Gansu province was relatively lower, it should be paid more attention by policy makers.