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基于遥感生态指数的东江源区2000-2019年生态环境质量评价
周萌1, 刘友存2, 孟丽红3, 焦克勤4, 李奇2, 邹心怡1
1.江西理工大学 土木与测绘工程学院, 江西 赣州 341000;2.江西理工大学 资源与环境工程学院, 江西 赣州 341000;3.赣南师范大学 地理与环境工程学院, 江西 赣州 341000;4.中国科学院 西北生态环境资源研究院, 甘肃 兰州 730000
摘要:
[目的] 对2000—2019年东江源区域生态环境变化进行分析,从而为该区水源地的保护和利用提供科学依据。[方法] 以东江源为研究对象,选取2000,2004,2009,2014和2019年5期的Landsat影像数据,提取绿度(NDVI)、湿度(WET)、干度(NDBSI)和热度(LST)4项指标,采用主成分分析法与遥感生态指数(RSEI)法,对东江源生态环境质量进行了评价分析。[结果] 2000—2019年研究区的RSEI指数分别为0.356,0.538,0.332,0.608和0.637,生态环境质量呈现上升、下降和上升趋势,总体上生态环境质量明显改善。生态环境较好的区域主要分布在植被覆盖率较高的中部和东南部,较差的区域主要分布在人类活动密切的东部和西北部的城镇区。研究区内优良等级的生态环境质量占主导地位,其面积比例由2000年的0.204 9%上升到2019年的92.346 4%,生态环境明显变好。热度(LST)和干度指标(NDBSI)重心偏移变化较小,为1.616 km和1.482 km,而绿度(NDVI)和湿度指标(WET)受人口密度和开发程度的影响,绿地分布和土壤含水量随着建设用地的开发而开始分散,使偏移量增大。[结论] 在2000—2019年,除城市交通造成周边的环境质量下降外,其余地区较之前都有明显的改善。植被覆盖和城市用地之间的关系是造成东江源生态环境变化的主要成因。
关键词:  遥感生态指数  生态环境质量  时空变化  重心偏移  东江源
DOI:10.13961/j.cnki.stbctb.2021.04.032
分类号:X826;X87
基金项目:国家自然科学基金项目“稀土矿区典型流域水沙过程与氨氮及重金属多界面迁移机制研究”(41861002);江西省自然科学基金资助项目(20202BABL203031);江西省教育厅科技项目(GJJ202015);江西省创新创业高层次人才“千人计划”项目(JXSQ2018106054)
Evaluation of Ecological Environment Quality of Dongjiang River Headwaters Based on Remote Sensing Ecological Index During 2000-2019
Zhou Meng1, Liu Youcun2, Meng Lihong3, Jiao Keqin4, LI Qi2, Zou Xinyi1
1.School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China;2.School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China;3.College of Geography and Environmental Engineering, Gannan Normal University, Ganzhou, Jiangxi 341000, China;4.Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
Abstract:
[Objective] The ecological environmental changes in the headwaters of Dongjiang River in 2000—2019 were analyzed to provide scientific basis for the protection and utilization of the water source area. [Methods] Based on Landsat image data of 2000,2004,2009,2014 and 2019, four indexes including green degree (NDVI), humidity (WET), dryness (NDBSI) and heat (LST) were extracted. Principal component analysis and remote sensing ecological index (RSEI) were used. The ecological environment quality of the headwaters of Dongjiang River was evaluated and analyzed. [Results] From 2000 to 2019, the RSEI index in the study area was 0.356, 0.538, 0.332, 0.608 and 0.637, respectively. The ecological environment quality showed an upward trend, a downward trend and an upward trend. Overall, the ecological environment quality was significantly improved. The regions with better ecological environment were mainly distributed in the central and southeastern areas with higher vegetation coverage, while the regions with worse ecological environment were mainly distributed in the eastern and northwestern urban areas with close human activities. In the study area, the ecological environment quality of excellent level was dominant, and its area proportion had increased from 0.204 9% in 2000 to 92.346 4% in 2019, indicating that the ecological environment had significantly improved. The shift of gravity center of heat (LST) and dryness index (NDBSI) was 1.616 km and 1.482 km, while the shift of green density (NDVI) and moisture index (WET) was affected by population density and development degree. The distribution of green land and soil moisture began to scatter with the development of construction land, which increased the shift. [Conclusion] From 2000 to 2019, except for the deterioration of the surrounding environmental quality caused by urban transportation, the rest of the region had significant improvement compared with the previous period. The relationship between vegetation cover and urban land use was the main cause of ecological environment change in the headwaters of Dongjiang River.
Key words:  remote sensing ecological index  ecological environment quality  spatiotemporal variation  center of gravity deviation  Dongjiang River headwaters