自然资源学报 ›› 2015, Vol. 30 ›› Issue (4): 580-590.doi: 10.11849/zrzyxb.2015.04.005

• 资源生态 • 上一篇    下一篇

基于土地利用变化的农牧交错带典型流域生态风险评价——以洋河为例

徐兰1,2, 罗维2, 周宝同1   

  1. 1. 西南大学地理科学学院, 重庆400715;
    2. 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京100085
  • 收稿日期:2014-03-14 修回日期:2014-10-11 出版日期:2015-04-20 发布日期:2015-04-16
  • 通讯作者: 罗维(1973- ),男,四川金堂人,副研究员,主要研究区域生态风险与管理.E-mail:luow@rcees.ac.cn E-mail:luow@rcees.ac.cn
  • 作者简介:徐兰(1989-),女,陕西商洛人,硕士研究生,主要研究土地利用与土壤环境、景观生态.Email:xulan15829506401@163.com
  • 基金资助:

    国家自然科学基金项目(41271502,C031001).

Landscape Ecological Risk Assessment of Farming-Pastoral Ecozone Based on Land Use Change —A Case Study of the YangheWatershed, China

XU Lan1,2, LUO Wei2, ZHOU Bao-tong1   

  1. 1. School of Geography sciences, Southwest University, Chongqing 400715, China;
    2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, CAS, Beijing 100085, China
  • Received:2014-03-14 Revised:2014-10-11 Online:2015-04-20 Published:2015-04-16

摘要:

为揭示土地利用变化对农牧交错带典型流域生态风险的影响,在ArcGIS技术支持下,以洋河流域1990、1995、2000 和2008 年遥感数据和土地利用数据为基础,定量分析洋河流域1990—2008 年的土地利用动态变化特征;根据景观生态学理论,将研究区划分为525 个生态风险评价单元,从土地利用变化和景观结构角度构建景观生态风险评价模型,评价洋河流域生态风险的时空变化特征.结果表明:耕地和草地面积占研究区总面积的67%以上;1990—2008年,洋河流域总体景观生态风险值(ERI)由0.197 3 上升到0.238 4.低风险区(ERI≤0.17)面积减少3.53%,高风险区(ERI >0.68)面积减少0.43%,较低(0.17< ERI≤0.26)、中等(0.26< ERI≤0.42)和较高(0.42< ERI≤0.68)风险区面积均有增加,整体生态风险增加;洋河流域5 种风险等级分布较集中,具体表现为洋河支流及其一级支流两侧地区生态风险相对较大(ERI >0.26),而离河道越远的区域生态风险值越小(ERI≤0.26).

关键词: 土地利用变化, 生态风险, 农牧交错带, 洋河流域

Abstract:

To reveal the impact of land use change on ecological risk, dynamic changes of land uses in the Yanghe Watershed which is a typical farming-pastoral ecozone in north China were analyzed with ArcGIS technologies based on remote sensing and land use data during 1990- 2008. The Yanghe Watershed was divided into 525 ecological risk assessment units based on the theory of landscape ecology. A temporal and spatial model of ecological risk assessment in the study area was established based on land use changes and landscape structures. Results showed that the areas of farmland and grassland accounted for more than 67% of total area of the watershed. Generally, landscape ecological risk indicated by ecological assessment index (ERI) for the whole watershed increased from 0.1973 to 0.2384 during 1990 to 2008. The area for the lowest (ERI≤0.17) and the highest (ERI >0.68) ecological risks reduced by 3.53% and 0.43%, respectively, while the areas of the lower (0.17< ERI≤0.26), the medium (0.26< ERI≤0.42)and the higher (0.42< ERI≤0.68) ecological risks increased. Distributions of five ecological risk grades were relatively concentrated. The sites with the relative high risk grade (ERI >0.26) were located along the main streams and sub- streams of the Yanghe Watershed, while those with the lower risk (ERI≤0.26) were further away from these streams.

Key words: land use change, farming-pastoral ecozone, ecological risk, the Yanghe Watershed

中图分类号: 

  • X171.1