基于GIS的广东省"旱改水"项目新增水田适宜性评价方法研究

目的]构建科学性、实用性强的广东省新增水田适宜性评价指标体系,解决占补平衡过程中水田补充不足的问题。方法]将GIS空间分析技术、层次分析法及特尔菲法相结合,选取灌溉保证率、地形坡度、田面坡度、有机质含量、田块规模5个因素作为新增水田适宜性评价因子,构建广东省"旱改水"项目新增水田适宜性评价模型,对广东省旱地、可调整地类、未利用地以及现有补充耕地进行新增水田适宜性分析。结果]研究区新增水田适宜性分为4个等级,即最适宜、适宜、勉强适宜、不适宜,面积分别为366 142、419 483、497 581、179 800 hm~2,分别占研究区总面积的25.03%、28.67%、34.01%、12.29%。评价分析结果与实际情况较为吻合,确认该适宜性评价方法精确、易操作和符合广东省实际情况。结论]该评价方法及结果为广东省开展"旱改水"工程新增水田实际项目提供了参考。

Research on Suitability Evaluation Methodf or Ne w Paddy Field in 'Dry Land Is Changed into Paddy Fields' Project Based on GIS

Objective]The aim was to establish a suitability evaluation method for new paddy field in'dry land is changed to paddy fields' pro-ject to solve the problem of inadequate paddy fields in the balance process.Method]GIS spatial analysis technique,analytic hierarchy process and Delphi method were combined;five factors like irrigation guarantee rate,topographic slope,field slope, organic content and field scale were chosen as new water field suitability evaluation factor;a suitability evaluation method for new paddy field in'dry land is changed to paddy fields' project of Guangdong Province was established;the suitability evaluation of new paddy field was carried out for dry land,adjustable land,unused land and existing supplementary cultivated land.Result]The suitability of new paddy field of studied area was divided into four grades,that is the most suitable,suitable,barely suitable and unsuitable,whose areas were 366 142,419 483,497 581 and 179 800 hm2,respectively,which ac-counted for 25.03 %,28.67 %,34.01%and 12.29%of total studied area.The evaluation result was more consistent with practical condition,so it was suggested that the suitability evaluation method was precise,simple and suitable for Guangdong Province.Conclusion]The evaluation result provides reference for Guangdong Province to carry out 'dry land is changed to paddy fields' project.