Spatiotemporal Dynamics and Drivers of Soil Erosion in the Mountainous Areas of South Anhui from 1990 to 2020

doi:10.19657/j.geoscience.1000-8527.2025.025

Abstract

Abstract:

Based on GIS technology and CSLE model, this paper quantitatively evaluated the spatiotemporal variation characteristics of soil erosion in the study area in 1990, 2000, 2010 and 2020, and focused on the relationship between soil erosion and land use, slope and altitude.The results showed that the amount of soil erosion in the study area in the four phases from 1990 to 2020 was 57.19 million t, 48.93 million t, 66.69 million t and 65.65 million t respectively, and the average soil erosion modulus was 1336 t/(km²·a), 1,143 t/(km²·a), 1,558 t/(km²·a)and 1,558 t/(km²·a), respectively.The degree of soil erosion was mainly slight and mild, and the overall spatial distribution was low in the north and high in the south.The mountainous areas of Chizhou, Huangshan and Xuancheng were the key areas for soil erosion prevention and control.The spatial distribution of soil erosion was closely related to land use, slope and altitude, and the degree of soil erosion in woodland was higher than that in cultivated land, which was related to the distribution degree of land use patterns.Soil erosion modulus increased with the increase of slope and altitude, and the soil erosion was the largest in the area with slope of 25-35, with an annual average of 9,609,200 t, accounting for 32.79%, and the largest in the area with altitude of 200-500 m, with an annual average of 13,067,500 t, accounting for 39.24%.Therefore, it is necessary to further strengthen the ecological restoration and soil and water conservation in these areas in the future.The results of this study can provide scientific basis for comprehensive control of soil erosion in mountainous areas of Southern Anhui.

Key words: CSLE model, soil erosion, land use, mountainous area of South Anhui

CLC Number:

P934
S157.1

XIAO Yuexin, SUN Zelong, MIN Yingzi, YANG Pengzhi, TIAN Zhaofei, CHENG Ming, LAN Jianmei. Spatiotemporal Dynamics and Drivers of Soil Erosion in the Mountainous Areas of South Anhui from 1990 to 2020[J]. Geoscience, 2025, 39(02): 478-494.

Figures/Tables 23

References 42

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数据	精度	来源
中国1 km分辨率逐月降水量数据集	1 km	国家科技基础条件平台—国家地球系统科学数据中心(http://www.geodata.cn)
土壤质地数据	1:100万	国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn)
土地利用数据	30 m	地球大数据科学工程数据共享服务系统(https://data.casearth.cn/sdo/detail/6123651428a58f70c2a51e48)
NDVI数据集	1 km	中国年度植被指数(NDVI)空间分布数据集,资源环境科学数据注册与出版系统(http://www.resdc.cn/DOI),2018.DOI:10.12078/2018060601)
DEM数据	30 m	地理空间数据云(https://www.gscloud.cn/search)

数据	精度	来源
中国1 km分辨率逐月降水量数据集	1 km	国家科技基础条件平台—国家地球系统科学数据中心(http://www.geodata.cn)
土壤质地数据	1:100万	国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn)
土地利用数据	30 m	地球大数据科学工程数据共享服务系统(https://data.casearth.cn/sdo/detail/6123651428a58f70c2a51e48)
NDVI数据集	1 km	中国年度植被指数(NDVI)空间分布数据集,资源环境科学数据注册与出版系统(http://www.resdc.cn/DOI),2018.DOI:10.12078/2018060601)
DEM数据	30 m	地理空间数据云(https://www.gscloud.cn/search)

年份	最大值 (MJ·mm/km^-2· h-1·a^-1)	最小值 (MJ·mm/km^-2· h-1·a^-1)	平均值 (MJ·mm/km^-2· h-1·a^-1)
1990	6934.83	3995.52	4408.07
2000	6065.20	2727.08	3856.50
2010	8568.40	3392.03	5150.20
2020	8024.08	3899.79	5162.78

年份	最大值 (MJ·mm/km^-2· h-1·a^-1)	最小值 (MJ·mm/km^-2· h-1·a^-1)	平均值 (MJ·mm/km^-2· h-1·a^-1)
1990	6934.83	3995.52	4408.07
2000	6065.20	2727.08	3856.50
2010	8568.40	3392.03	5150.20
2020	8024.08	3899.79	5162.78

土地利用类型 (LUCC)	植被盖度 (FVC,%)	B值	土地利用类型 (LUCC)	植被盖度 (FVC,%)	B值
林地	0~20	0.100	草地	0~20	0.450
	20~40	0.080		20~40	0.240
	40~60	0.060		40~60	0.150
	60~80	0.020		60~80	0.090
	80~100	0.004		80~100	0.043
水域	-	0	平耕地	-	0.230
建设用地	-	0.353	坡耕地	-	0.470