基于生态敏感性差异的农田整治投入优先序研究

INPUTS PRIORITY OF FARMLANDS HARNESS BASED ON ECOLOGICAL SENSITIVITY VARIANCE

近年来,中国各地投入了大量资金进行农田整治,取得了显著成效。对于生态脆弱区,结合生态敏感性差异来安排农田整治的先后顺序并提出合理的管控策略,是将农田整治与生态修复有机结合的重要前提,成为生态脆弱区农田整治中亟待解决的问题。论文以甘肃省景泰县为例,从自然和人文两个角度选取了高程、坡度、植被覆盖指数、水域、土地利用类型和道路6个生态敏感因子,运用层次分析法和熵值法相结合的方法确定权重,并利用GIS工具加权叠加进行生态敏感性评价,据此对近10年未实施过土地整治项目区域的耕地划分投入优先顺序。结果显示:1)景泰县生态敏感区可以划分为不敏感区、轻度敏感区、中度敏感区和重度敏感区4个等级;2)农田整治投入优先序可划分为一般投入区、次优先投入区、优先投入区和谨慎投入区,并从管控风险的角度提出各个区域未来农田整治策略及其需注意的问题。研究表明:运用生态敏感性差异确定农田整治投入优先序是一种较好的方法,符合国家新型资源观和国土空间用途管制要求,也符合生态环境脆弱区的实际情况。

China has largely invested in farmland harness with notable achievements gained.Appropriate managing strategies will be a vital basis for combining farmland harness with ecological restoration by means of ranking ecological sensitivity variances in ecologically vulnerable areas,which is a key issue in farmland harness.This paper,based on a case study on Gansu s Jingtai county,selects altitude,slope,vegetation index,water,land use categories and traffics from natural and human perspectives,and applies GIS to overlap weights in evaluating ecological sensitivities,which is used to rank inputs priority in farmlands where have not been harnessed in recent decade.Jingtai county s ecologically sensitive areas can be classified as not,mild,moderate and heavily,and its inputs priority of farmland harness is divided into general,sub-priority,priority and not recommended,which need appropriate harness strategies to control risks.This paper concludes that use of ecological sensitivity variances is a right way to rank inputs priority in farmland harness,complying with national regulations regarding new resources and land spatial use,and also consistent with the reality of eco-environmentally vulnerable areas.