土壤与生态

基于RSEI的延河流域生态环境质量监测与预估

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  • 1.长安大学地质工程与测绘学院,陕西 西安 710054
    2.长安大学水利与环境学院,陕西 西安 710054
王丽霞(1979-),女,副教授,博士,主要从事环境遥感与GIS应用研究. E-mail: zylxwang@chd.edu.cn

收稿日期: 2021-08-25

  修回日期: 2021-10-20

  网络出版日期: 2022-05-30

基金资助

陕西省自然科学基金项目(2021JM-161);中央高校基本科研业务资助项目(300102269201);中央高校基本科研业务资助项目(300102299206)

Monitoring and prediction of ecological environmental quality in the Yanhe River Basin based on the remote sensing ecological index

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  • 1. School of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China
    2. School of Water Conservancy and Environment, Chang’an University, Xi’an 710054, Shaanxi, China

Received date: 2021-08-25

  Revised date: 2021-10-20

  Online published: 2022-05-30

摘要

利用延河流域1998年、2004年、2010年和2016年4期的Landsat遥感影像,计算遥感生态指数(Remote Sensing Ecological Index,RSEI),对流域生态环境质量的时空变化进行分析和评价,利用CA-Markov模型对2022年和2028年的生态环境进行模拟和预测。结果表明:(1) RSEI评价指数在延河流域具有较好的适用性,可用于监测和评价流域生态环境的时空变化特征。(2) 时间尺度上,RSEI均值从1998年的0.392变化为2016年的0.530,呈逐年上升趋势,空间尺度上,RSEI从东南向西北逐渐增大。以0.2为间隔划分RSEI等级,发现流域生态环境质量等级以较差和中等为主,占总面积的62.4%,主要分布于流域的山谷地带,优良等级的面积占比最小,约为8.1%,主要分布于流域南部的山区地带。(3) 自然和人为因素对流域生态环境质量变化的影响存在较大空间差异性。其中海拔在1200~1800 m的区域,生态环境质量变化主要受自然因素影响;而海拔低于1200 m的区域,则主要受人类活动影响。(4) 预测到2028年,流域生态环境质量会持续提升,良好和优良等级的面积占比将达到66%,但是流域西北部由于生态环境本底脆弱,仍存在较大的问题。

本文引用格式

王丽霞,赵蕊,刘招,张双成,孔金玲,杨耘 . 基于RSEI的延河流域生态环境质量监测与预估[J]. 干旱区研究, 2022 , 39(3) : 943 -954 . DOI: 10.13866/j.azr.2022.03.28

Abstract

Based on Landsat remote sensing images of the Yanhe River Basin in 1998, 2004, 2010, and 2016, the remote sensing ecological index (RSEI) was calculated to analyze and evaluate temporal and spatial changes of environmental quality in the Yanhe River Basin. The CA-Markov model was also used to simulate and predict the ecological environment in 2022 and 2028. Results show that (1) the RSEI has good applicability in the Yanhe River Basin and can be used to monitor and evaluate temporal and spatial characteristics of the ecological environment in the basin. (2) For the time scale, the mean RSEI value changed from 0.392 in 1998 to 0.530 in 2016 and showed an increasing trend year by year. On a spatial scale, the RSEI gradually increased from southeast to northwest. RSEI grades were divided by 0.2 intervals and the total area of RSEI grades was mainly poor and moderate. These grades accounted for a total of 62.4%, which was distributed mainly in the valley of the basin, while the high grade area accounted for the least, at approximately 8.1%, which was distributed mainly in the mountainous region of the southern part of the basin. (3) There is a large spatial difference between the effects of natural and human factors on changes in environmental quality in the watershed. In the area with an altitude of 1200-1800 m, the change of eco-environmental quality was affected mainly by natural factors. However, areas below 1200 m are affected mainly by human activities. (4) It is predicted that by 2028, the ecological environment quality of the basin will continue to improve, and the area of good and high grade will account for 66%, but there are still big problems in the northwest of the basin because of the fragile ecological environment background.

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