doi:10.12202/j.0476-0301.2021049杨凯祥,
刘强^,,
李秀红,
陆彦蓉,
刘璐,
宋振威
北京师范大学遥感科学国家重点实验室，全球变化与地球系统科学研究院，100875，北京
基金项目:国家重点研发计划资助项目(2020YFA0608703)；国家自然科学基金资助项目 (20180913)

详细信息

通讯作者:刘强(1974-)，男，博士，副教授. 研究方向：多角度遥感、二向反射、反照率和热红外辐射等. E-mail：toliuqiang@bnu.edu.cn

中图分类号:TP79

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出版历程

收稿日期:2021-03-10
网络出版日期:2021-09-24
刊出日期:2021-10-01

Analysis of sil erosion and fractional vegetation cover change in the Three Gorges Reservoir Area

Kaixiang YANG,
Qiang LIU^,,
Xiuhong LI,
Yanrong LU,
Lu LIU,
Zhenwei SONG
State Key Laboratory of Remote Sensing Science, Collage of Global Change and Earth System Science, Beijing Normal University, 100875, Beijing, China



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摘要
摘要:基于Google Earth Engine平台，利用1987—2019年Landsat数据，合成30 m分辨率的三峡库区年度最大NDVI图像，通过像元二分法计算三峡库区年度最大植被覆盖度，分析植被覆盖度的时空动态；同时，利用修正通用土壤流失方程(RUSLE)，估算三峡库区2000和2010年的土壤侵蚀量(T)．研究结果表明：1)三峡库区1987—2019年植被覆盖度持续改善，植被覆盖度增加区域面积占三峡库区面积的75.35%，其中显著增加区域为39.26%．2) 三峡库区土壤侵蚀模数(A) 2010年为25.51 $ {\rm{t}}{\cdot \mathrm{h}\mathrm{m}}^{-2}\cdot {\mathrm{a}}^{-1} $，比2000年减少28.22%，水土流失强度明显下降；2010年的水土流失面积为$1.91\times {10}^{4}\;{\mathrm{k}\mathrm{m}}^{2}$，比2000年减少27.38%；坡度>15°区域的T超过整个区域T的86%，坡度>25°的区域T超过整个区域T的60%，海拔为0~500 m的区域T超过整个区域T的48%，海拔<1500 m的区域T接近整个区域T的70%，这些区域均是三峡库区水土流失的重点治理区域． 3)1987—2015年，降雨略微减少，气温有所升高，尤其是在人类植树造林等活动共同作用下，三峡库区植被覆盖度增加，土壤侵蚀减少．
关键词:Google Earth Engine/
Landsat/
土壤侵蚀/
RUSLE/
植被覆盖度
Abstract:Based on the Google Earth Engine (GEE) platform, the annual maximum NDVI images of the Three Gorges Reservoir Area were synthesized at 30 m resolution using Landsat data from 1987 to 2019, and the annual maximum fractional vegetation cover (FVC) of the Three Gorges Reservoir Area was calculated based on the image dichotomy method to analyze the spatial and temporal dynamics of FVC．Based on the GEE platform, the revised universal soil loss equation (RUSLE) was used to estimate the soil erosion (T) in the Three Gorges Reservoir Area in 2000 and 2010．The results showed that (1) the FVC in the Three Gorges Reservoir Area continued to improve from 1987 to 2019, and the area of the FVC increase area accounted for 75.35%, including a significantly increased area of 39.26%．(2) The soil erosion modulus (A) in the Three Gorges Reservoir Area was 25.51 $\mathrm{t}{\cdot \mathrm{h}\mathrm{m}}^{-2}\cdot {\mathrm{a}}^{-1}$ in 2010, a decrease of 28.22% compared with 2000, and the intensity of soil erosion decreased significantly; the erosion area was $1.91\times {10}^{4}\;{\mathrm{k}\mathrm{m}}^{2}$ in 2010, a decrease of 27.38% compared with 2000．Soil erosion in the area with slope >15° exceeds 86% of the soil erosion in the whole area, soil erosion in the area with slope >25° exceeds 60% of the soil erosion in the whole area, soil erosion in the area with elevation 0-500 m exceeds 48% of the soil erosion in the whole area, and soil erosion in the area <1500 m is close to 70% of the soil erosion in the whole area, which is the key area for erosion control in the Three Gorges Reservoir Area．It is the key management area of soil erosion in the Three Gorges Reservoir Area．(3) From 1987 to 2015, rainfall slightly decreased and temperature increased, especially with the combined effect of human activities such as afforestation, which increased FVC and reduced soil erosion in the Three Gorges Reservoir Area．
Key words:Google Earth Engine/
Landsat/
soil erosion/
RUSLE/
fractional vegetation cover