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基于USLE模型的长株潭城市群生态绿心区水土流失研究
陈学林, 文仕知, 杨丽丽, 何功秀, 周沁, 夏焱
中南林业科技大学 林学院, 湖南 长沙 410004
摘要:
[目的] 研究2018年长株潭(长沙市—株州市—湘潭市)城市群生态绿心区最佳植被覆盖和水土流失状况,为区域综合治理提供理论依据。[方法] 运用GIS和RS技术,以长株潭区域降雨、土壤、地形、土地利用等数据为基础,采用归一化植被指数(NDVI)模型和USLE国际通用土壤流失方程为优选模型。[结果] 长株潭绿心区总面积为52 287 hm2,整体植被状况较好,高覆盖度(75%~100%)面积最大,占绿心区总面积一半以上,为26 598.40 hm2;中低覆盖度(30%~40%)面积最小,占区域总面积的8.61%,为4 501.91 hm2。长株潭城市群生态绿心区总侵蚀(不含微度)面积为3 654.24 hm2,占总面积的6.99%。湘潭市侵蚀比重最高,为8.51%,长沙市次之,为6.67%,株洲市侵蚀总比例最小,为5.68%。工程建设用地在禁止开发区、限制开发区和控制建设区的侵蚀面积分别为963.92,310.74,735.11 hm2。[结论] 受人为因素、城市建设、产业分布等影响,长株潭城市群生态绿心区覆盖度空间呈现西部低,中东部高的格局,工程建设是造成绿心区土壤侵蚀的主要原因。
关键词:  长株潭城市群  生态绿心区  植被覆盖度  NDVI  USLE  水土流失评价
DOI:10.13961/j.cnki.stbctb.20200628.001
分类号:S157;P237
基金项目:湖南省水利厅水土保持监测总站“长株潭绿心保护区动态监测项目”(2130310)
A Study on Soil and Water Loss in Ecological Green Heart Area of Changsha-Zhuzhou-Xiangtan Urban Agglomeration Based on USLE Model
Chen Xuelin, Wen Shizhi, Yang Lili, He Gongxiu, Zhouqin, Xia Yan
College of Forestry, Central South University of Forestry&Technology, Changsha, Hu'nan 410004, China
Abstract:
[Objective] The optimal vegetation coverage of the ecological green heart area of Changsha-Zhuzhou-Xiangtan urban agglomeration and the regional soil and water loss status in 2018 were studied to provide a theoretical basis for comprehensive management of regional soil erosion.[Methods] Using GIS and RS technology, based on rainfall, soil, terrain, land use and other data in the Changsha-Zhuzhou-Xiangtan area, the normalized difference vegetation index and USLE were adopted as the preferred models.[Results] The total area of the Changsha-Zhuzhou-Xiangtan green heart area was 52 287 hm2, and the overall vegetation condition was above par. The high coverage (75%~100%) area was the largest, constituting more than half of the total area of the green heart area (26 869.79 hm2); the low coverage (30%~40%) area was the smallest, being only 8.61% of the total area (4 501.90 hm2). The total area of erosion (excluding microdegree) in the green heart area was 3 654.24 hm2 (which was 6.99% of the total area). The proportion of erosion in Xiangtan City was the highest (8.51%), followed by Changsha City (6.67%) and Zhuzhou City (5.68%). The erosion area of construction land was 963.92, 310.74, and 735.11 hm2 in the prohibited development zone, restricted development zone, and the controlled construction zone, respectively.[Conclusion] The coverage space of the ecological green heart area of Changsha-Zhuzhou-Xiangtan urban agglomeration appeared to be low in the west and high in the middle-east part, which might have resulted from man-made factors, urban construction, and industrial distributions. Engineering construction was the main reason for soil and water loss in the green heart area.
Key words:  ecological green heart area  Changsha-Zhuzhou-Xiangtan urban agglomeration  vegetation coverage  normalized difference vegetation index (NDVI)  universal soil loss equation (USLE)  soil erosion evaluation