基于地形复杂度的农用地整治项目选址适宜性评价*——以甘肃省天水市为例

SITE SELECTION SUITABILITY EVALUATION OF AGRICULTURAL LAND CONSOLIDATION PROJECT BASED ON THE TERRAIN COMPLEXITY*——TAKING TIANSHUI CITY IN GANSU PROVINCE AS AN EXAMPLE

关键词:  DEM地形复杂度农用地整治适宜性评价天水市

Key words:  DEM  terrain complexity  farmland regulation  suitability  Tianshui city

摘要:

［目的］地形条件对农用地整治具有一定的约束作用，是整治项目选址必须考虑的因素。［方法］该研究应用Arcgis地理软件及数字高程模型，结合海拔高度、坡度、地表破碎度3个地形因子，综合评价天水市农用地整治项目选址适宜性。［结果］天水市的土地面积主要分布在坡度为10°～15°的海拔高度为1 319～2 011m的地区，地势复杂，地貌分异明显； 秦州区和麦积区整体海拔高度相对较小，天水市中部地区，地势相对平坦，土地整治较为适宜； 地表破碎度、海拔高度及坡度之间存在一定的内在联系； 天水市各乡镇的综合地形复杂度平均值为0308，处于非常适宜、比较适宜，临界适宜的乡镇有74个； 新兴镇、洛门镇、郭川乡、新阳乡、安远镇、兴丰乡坡度均在15°以下，综合地形复杂度较小，且集中连片程度较好，是农用地整治项目选址较为适宜地区。［结论］应用地形复杂度对天水市农用地整治项目进行选址，集中整合开发整治农用地，对于提高工程效率，减少地形约束、降低施工成本具有积极作用。

Abstract:

Terrain conditions have certain constraints effect on agricultural land consolidation, which is a must factor to be considered in site selection of renovation projects. In this study, arcgis geographic analysis software and the digital elevation model were applied and three topographic factors including elevation, slope and surface fragmentation were combined to comprehensively evaluate the site selection suitability of Tianshui agricultural land consolidation project. The results show that he land area of Tianshui city are mainly distributed in the area with a slope of 10~15 ° and an altitude of 1 319~2 011m, the terrain is complex and the landforms are significantly different. The overall altitude of Qinzhou and Maiji is relatively small, the central area of Tianshui is relatively flat, and land consolidation is more appropriate. There is a certain internal relation among the surface of the fragmentation, elevation and slope. The average comprehensive terrain complexity of all towns and villages in Tianshui city is 0.308, and there are 74 towns in a very appropriate, relatively appropriate or critical appropriate state. The slopes of Xinxing Town, Luomen Town, Guochuan Township, Xinyang Township, Anyuan Town, and Xingfeng Township are all under 15 degrees, the integrated terrain complexity of these areas is relatively small, and the degree of concentration and continuity is better, so they are suitable areas for agricultural land consolidation projects. As a result, the application of terrain complexity to the site selection of Tianshui agricultural land renovation project and the centralized integration of development and improvement of agricultural land play a positive role in improving project efficiency, reducing topographic constraints and reducing construction costs.