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西南大学资源环境学院, 重庆 400715
Received:02 February 2026,
Revised:2026-03-13,
Accepted:27 March 2026,
Online First:14 April 2026,
Published:28 August 2026
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江雨芙,史东梅,刘方元,等.三峡库区典型县域土壤保持功能时空演变特征及驱动力[J].水土保持学报,2026,40(4):454-464.
Jiang Yufu, Shi Dongmei, Liu Fangyuan, et al. Spatiotemporal evolution characteristics and driving factors of soil conservation function in a typical county of Three Gorges Reservoir Area[J]. Journal of Soil and Water Conservation, 2026, 40(4):454-464.
江雨芙,史东梅,刘方元,等.三峡库区典型县域土壤保持功能时空演变特征及驱动力[J].水土保持学报,2026,40(4):454-464. DOI: 10.13870/j.cnki.stbcxb.2026.04.021. CSTR: 32310.14.stbcxb.2026.04.021.
Jiang Yufu, Shi Dongmei, Liu Fangyuan, et al. Spatiotemporal evolution characteristics and driving factors of soil conservation function in a typical county of Three Gorges Reservoir Area[J]. Journal of Soil and Water Conservation, 2026, 40(4):454-464. DOI: 10.13870/j.cnki.stbcxb.2026.04.021. CSTR: 32310.14.stbcxb.2026.04.021.
目的
2
为探究三峡库区土壤保持功能的时空演变特征及驱动力。
方法
2
以三峡库区典型县域万州为例,基于1990—2020年多源遥感数据,运用InVEST模型评估土壤保持功能空间分异特征,并结合地理探测器模型分析演变驱动机制,探讨坡度对坡耕地土壤保持功能影响及调控措施。
结果
2
1)1990—2020年,万州土壤保持功能呈先增后减趋势,空间格局呈东高西低,土地利用以坡耕地、林地为主要类型。2)万州土壤保持功能空间集聚特征显著,低-低集聚区由北向西南扩展,高-高集聚区集中于东部;核密度高值区长期位于中部,核密度值呈先波动下降、后回升趋势。3)土壤保持功能空间分异的核心驱动因素为自然环境因素,坡度(0.71)是主导因子,其次为植被覆盖度(0.43)与土壤类型(0.24);各因子交互作用均表现为增强效应,其中坡度与温度、坡度与植被覆盖度等组合解释力最强(
q
>
0.75)。4)坡耕地土壤保持功能高低与坡度密切相关,3°~8°坡耕地土壤保持功能稳定[120.64~379.35 t/(hm
2
·a)],8°~25°坡耕地土壤保持功能处于中等水平[61.17~81.93 t/(hm
2
·a)],可针对不同坡度采取差异化治理措施,低坡度区推
广秸秆覆盖与横坡垄作,中坡度区结合工程与植物措施,
>
25°坡耕地需优先实施退耕还林还草。
结论
2
研究结果可为三峡库区水土流失防控与生态修复提供科学依据。
Objective
2
This study aims to investigate the spatiotemporal evolution characteristics and driving factors of soil conservation in the Three Gorges Reservoir area.
Methods
2
Taking Wanzhou, a representative county in the Three Gorges Reservoir area, as a case study, multi-source remote sensing data from 1990 to 2020 were used. The InVEST model was applied to assess the spatial differentiation characteristics of soil conservation function, and the Geodetector model was employed to analyze the driving mechanisms of its evolution. The influence of slope on soil conservation in sloping cropland and corresponding regulation measures were also explored.
Results
2
1) From 1990 to 2020, soil conservation function in Wanzhou exhibited a trend of increase followed by decrease, with a spatial pattern of higher values in the east and lower values in the west. Land use types were mainly sloping cropland and forest land. 2) Soil conservation function in Wanzhou demonstrated significant spatial clustering characteristics, with low-low clustering areas expanding from the north to the southwest, and high-high clustering areas concentrated in the eastern region. Kernel density high-value areas were consistently located in the central region, and kernel density values showed a fluctuating decrease followed by an increase. 3) Natural environmental factors were the primary drivers of spatial differentiation in soil conservation function. Slope (
q
=0.71) was the dominant factor, followed by vegetation coverage (
q
=0.43) and soil type (
q
=0.24). Interactions among all factors showed enhancement effects, among which combinations such as slope and temperature, and slope and vegetation coverage, exhibited the strongest effects (
q
>
0.75). 4) Soil conservation function in sloping cropland was closely related to slope. On slopes from 3° to 8°, soil conservation function remained stable [from 120.64 t/(hm
2
·a) to 379.35 t/(hm
2
·a)]. On slopes from 8° to 25°, it was at a moderate level [from 61.17 t/(hm
2
·a) to 81.93 t/(hm
2
·a)]. Differentiated management measures could be adopted for different slope gradients: low-slope areas should adopt straw mulching and contour ridge tillage, medium-slope areas should combine engineering and vegetation measures, and slopes
>
25° should prioritize conversion of cropland to forest and grassland.
Conclusion
2
The results provide a scientific basis for soil erosion control and ecological restoration in the Three Gorges Reservoir area.
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