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中国农学通报

中国农学通报 ›› 2017, Vol. 33 ›› Issue (7): 118-127.doi: 10.11924/j.issn.1000-6850.casb16110120

所属专题： 资源与环境； 农业生态； 耕地保护

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

基于GIS的秦巴山区土地生态敏感性评价——以陇南山区为例

党国锋,纪树志   

  1. 西北师范大学地理与环境科学学院 甘肃兰州 730070,西北师范大学地理与环境科学学院 甘肃兰州 730070
  • 收稿日期:2016-11-23 修回日期:2016-12-16 接受日期:2016-12-23 出版日期:2017-03-16 发布日期:2017-03-16
  • 通讯作者: 纪树志
  • 基金资助:
    国家国际科技合作专项(2013DFG70990)。

Ecological Sensitivity Evaluation Based on GIS in Qinba Mountainous Area A Case Study of Longnan Mountainous Area

  • Received:2016-11-23 Revised:2016-12-16 Accepted:2016-12-23 Online:2017-03-16 Published:2017-03-16

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摘要： 生态环境敏感性评价是进行生态功能区划的前提条件,也是判断生态系统稳定性的重要手段。进行土地生态环境敏感性评价,是落实科学发展观和生态文明理念,加快实施主体功能区规划和建设国家生态安全屏障的重要举措,对推动陇南市可持续发展和维护国家生态安全具有重要意义。本文根据陇南市山地生态系统基本特征,运用GIS技术,从土壤侵蚀、石漠化、和地质灾害三个方面对陇南市土地生态敏感性展开单因子评价和综合评价,并对综合评价结果进行趋势面分析。评价结果表明：(1)陇南市土地生态敏感性区域差异比较明显,在东西方向上为东高西低,整体呈递减趋势,在南北方向上呈现较为明显的“n”字型,南部略高于北部;(2)运用自然断点法,将陇南市土地生态敏感性分为极敏感区、高敏感区、中敏感区、低敏感区和不敏感区,分别占市域总面积的23.58 %、26.22%、24.46%、15.63%和10.12%;其中极敏感区和高敏感区主要分布在宕昌县和武都区等周边地区,该区生态敏感极强,需要加强保护,开发强度不宜过高；低敏感和不敏感区域主要分布在礼县、西和县、徽县和成县等大多数区域,可以适当进行开发。

关键词: 雷电灾害风险评估, 雷电灾害风险评估, PB因子, 选取方法

Abstract: Evaluation of eco- environmental sensitivity is the precondition of ecological function regionalization, Sis also important means to judge the stability of ecosystem.Which is the important measures to carry out the concept of scientific development and the ecological civilization concept , to speed up the implementation of the planning of main functional area andSbuild national ecological security barrier .The method has great significances to promote sustainable development of longnan city and safeguard national ecological security.According to the basic characteristics of longnan mountain ecosystems,this paper use GIS technology and individually and synthetically evaluate to the ecological sensitivity of land in Longnan city frome the three aspects: soil erosion, rocky desertification and geological disaster. And use trend the surface-method to analyze comprehensive evaluation results.The results showed(1)The regional difference of land ecological sensitivity in Longnan city is obvious, the east is higher than west in the east-west direction,decreasing trend on the whole and present a more obvious "n" word in latitudinal direction, slightly higher than the north in the south；(2)Using natural breakpoint method, Longnan’s eco- environmental sensitivity can be divided into five areas: extremely sensitive area, high sensitive area, medium sensitive area, low sensitive area and insensitive area,accounting for 19.18%, 24.61%, 25.71%,16.88% and 13.61%, respectively;The extremely sensitive area and high sensitive area are mainly distributed in in the surrounding areas of tanchang County and Wudu district, the ecological sensitivity of these ears is extremely strong and need to strengthen the protection and the development intensity is low-intensity developed; The low sensitive and insensitive regions are mainly distributed in most areas such as Li county, Xihe county, Hui county and Cheng county which can be developed advisably.