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[1]DU Ruizhe,LI Wendong,GAO Wenhao,et al.Influence of Climate and Surface Cover Changes on Spatiotemporal Changes of Wind Erosion in Pisha Sandstone Area[J].Research of Soil and Water Conservation,2023,30(05):31-40.[doi:10.13869/j.cnki.rswc.2023.05.050.]

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Influence of Climate and Surface Cover Changes on Spatiotemporal Changes of Wind Erosion in Pisha Sandstone Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 31-40 Column: Public date: 2023-08-10

Title:: Influence of Climate and Surface Cover Changes on Spatiotemporal Changes of Wind Erosion in Pisha Sandstone Area

Author(s):: DU Ruizhe, LI Wendong, GAO Wenhao, FU Jinxia, QI Yanbing, LI Zhi; (College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: Pisha Sandstone Area; wind erosion; Modified WEQ Mode; spatiotemporal change; impact contribution; elastic coefficient

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.05.050.

Abstract:: [Objective] The aim of this study is to explore the influence of climate and surface cover changes on spatiotemporal changes of wind erosion in Pisha Sandstone Area in the northern Loess Plateau as well as its main control factors, and then to provide scientific support. [Methods] Based on Modified Wind Erosion Model(WEQ)and daily meteorological data from 1980 to 2017, Landsat remote sensing images and land use maps of four periods(1990, 1995, 2005, 2015), 30 m resolution DEM data and soil data of the study area, we analyzed the spatiotemporal change characteristics of wind erosion intensity in Pisha Sandstone Area in 1980s, 1990s, 2000s and 2010—2017 using GIS and RS technologies, and the impacts of wind erosion meteorological factors(W), vegetation coverage(VC)and land use change on the spatiotemporal changes of wind erosion based on the pixel scale. [Results] With the passage of time, the meteorological factors of wind erosion first decreased and then increased and exceeded the initial value, the vegetation coverage continued to increase and stabilized, and the changes of grassland and cultivated land in land use were obvious. The average wind erosion modulus in the four periods were 4 187 t/(km²·a), 599 t/(km²·a), 724 t/(km²·a)and 870 t/(km²·a), respectively, and the wind erosion showed a trend of obvious weakening and then slightly strengthening in local areas. In the four periods, the wind erosion modulus was significantly positively correlated with W(correlation coefficient 0.248～0.678), and the increase of W value would aggravate the increase in wind erosion fluctuation; wind erosion and VC showed the significant negative correlation(correlation coefficient-0.556～-0.490), and the low vegetation cover area was prone to wind erosion fluctuation enhancement; grassland and cultivated land were the main areas of wind erosion, and the increase of wind erosion in grassland area in 2000s—2010s was large, and the wind erosion intensity of forest land was the smallest after 1990 s. Wind erosion was most sensitive to VC in soil-covered region of Pisha Sandstone Area, while it was more sensitive to W in sand-covered region and bare region of Pisha Sandstone Area. The total contribution rates of VC and W to the reduction of wind erosion were 54%, 72% and 83% in soil-covered region, sand-covered region and bare region of Pisha Sandstone Area, respectively, and the contribution rates of other factors to erosion reduction in these three regions were 46%, 28% and 17%, respectively. The improvement of vegetation coverage had a far-reaching impact on the reduction of wind erosion. [Conclusion] VC and W are the main control factors of wind erosion reduction in Pisha Sandstone Area, and the improvement of vegetation cover has a profound impact on erosion reduction. The construction of vegetation and engineering measures should be continually strengthened in the future.

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Last Update: 2023-08-10