Effects of landscape patterns on runoff and sediment export from typical agroforestry watersheds in the Three Gorges Reservoir area, China

Zhilin, 黄志霖 Huang; Yaowu, 田耀武 Tian; Wenfa, 肖文发 Xiao; Deju, 马德举 Ma

doi:10.5846/stxb201209051257

Cited by 4 publications

(1 citation statement)

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“…As a comprehensive reflection of the ecological-environmental system in a region, the landscape pattern is a spatial arrangement of different landscape mosaics that results from the interaction of multiple natural and human factors [1,2]. Changes in the spatial distribution of the landscape pattern can affect the water cycle and therefore soil erosion Land 2021, 10, 990 2 of 18 and sediment yield in a region [3,4]. Hence, studying the response of the water and sediment processes to landscape pattern changes in a river basin from a landscape ecology perspective can to some extent reveal the effects of changes in natural conditions and human activity on the water and sediment in the river basin [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A New Indicator to Better Represent the Impact of Landscape Pattern Change on Basin Soil Erosion and Sediment Yield in the Upper Reach of Ganjiang, China

Zhang

Wang

Tang

et al. 2021

Land

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Landscape patterns are a result of the combined action of natural and social factors. Quantifying the relationships between landscape pattern changes, soil erosion, and sediment yield in river basins can provide regulators with a foundation for decision-making. Many studies have investigated how land-use changes and the resulting landscape patterns affect soil erosion in river basins. However, studies examining the effects of terrain, rainfall, soil erodibility, and vegetation cover factors on soil erosion and sediment yield from a landscape pattern perspective remain limited. In this paper, the upper Ganjiang Basin was used as the study area, and the amount of soil erosion and the amount of sediment yield in this basin were first simulated using a hydrological model. The simulated values were then validated. On this basis, new landscape metrics were established through the addition of factors from the revised universal soil loss equation to the land-use pattern. Five combinations of landscape metrics were chosen, and the interactions between the landscape metrics in each combination and their effects on soil erosion and sediment yield in the river basin were examined. The results showed that there were highly similar correlations between the area metrics, between the fragmentation metrics, between the spatial structure metrics, and between the evenness metrics across all the combinations, while the correlations between the shape metrics in Combination 1 (only land use in each year) differed notably from those in the other combinations. The new landscape indicator established based on Combination 4, which integrated the land-use pattern and the terrain, soil erodibility, and rainfall erosivity factors, were the most significantly correlated with the soil erosion and sediment yield of the river basin. Finally, partial least-squares regression models for the soil erosion and sediment yield of the river basin were established based on the five landscape metrics with the highest variable importance in projection scores selected from Combination 4. The results of this study provide a simple approach for quantitatively assessing soil erosion in other river basins for which detailed observation data are lacking.

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Section: Introductionmentioning

confidence: 99%

A New Indicator to Better Represent the Impact of Landscape Pattern Change on Basin Soil Erosion and Sediment Yield in the Upper Reach of Ganjiang, China

Zhang

Wang

Tang

et al. 2021

Land

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Effects of land use patterns on stream water quality: a case study of a small-scale watershed in the Three Gorges Reservoir Area, China

Huang

Han

Zeng

et al. 2015

Environ Sci Pollut Res

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In this study, we have considered the relationship between the spatial configuration of land use and water quality in the Three Gorges Reservoir Area. Using land use types, landscape metrics, and long-term water quality data, as well as statistical and spatial analysis, we determined that most water quality parameters were negatively correlated with non-wood forest and urban areas but were strongly positively correlated with the proportion of forest area. Landscape indices such as patch density, contagion, and the Shannon diversity index were able to predict some water quality indicators, but the mean shape index was not significantly related to the proportions of farmland and water in the study area. Regression relationships were stronger in spring and fall than in summer, and relationships with nitrogen were stronger than those of the other water quality parameters (R(2) > 0.80) in all three seasons. Redundancy analysis showed that declining stream water quality was closely associated with configurations of urban, agricultural, and forest areas and with landscape fragmentation (PD) caused by urbanization and agricultural activities. Thus, a rational land use plan of adjusting the land use type, controlling landscape fragmentation, and increasing the proportion of forest area would help to achieve a healthier river ecosystem in the Three Gorges Reservoir Area (TGRA).

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The effects of landscape pattern evolution on runoff and sediment based on SWAT model

et al. 2021

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Effects of landscape patterns on runoff and sediment export from typical agroforestry watersheds in the Three Gorges Reservoir area, China

Cited by 4 publications

References 0 publications

A New Indicator to Better Represent the Impact of Landscape Pattern Change on Basin Soil Erosion and Sediment Yield in the Upper Reach of Ganjiang, China

A New Indicator to Better Represent the Impact of Landscape Pattern Change on Basin Soil Erosion and Sediment Yield in the Upper Reach of Ganjiang, China

Effects of land use patterns on stream water quality: a case study of a small-scale watershed in the Three Gorges Reservoir Area, China

The effects of landscape pattern evolution on runoff and sediment based on SWAT model

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