Soil conservation effect of cropland use change in the Yellow River-Huangshui River Valley over the past 20 years
CHENG Yuzhuo1, ZHAO Wenting1, JIAO Juying1,2, ZHANG Liping3, CAO Xue2, CHEN Tongde1, LI Jianjun1, ZHANG Ziqi1
1. Institute of Soil and Water Conservation, Northwest A&F University, 712100, Yangling, Shaanxi, China; 2. Institute of Soil and Water Conservation, CAS, 712100, Yangling, Shaanxi, China; 3. Agricultural Technology Extension Center of Huangzhong District in Xining City, 811600, Xining, China
Abstract：[Background]Soil conservation is a regulatory service provided by ecosystems to reduce soil erosion. By altering the surface environment,soil conservation function has been greatly affected by human land use activities in recent years.Yellow River-Huangshui River Valley (YHV), the main agricultural area of Qinghai province, has had huge changes in the use of croplandand soil conservation under the dual drive of the project of returning farmland to forests and the large-scale development of the western region in the past two decades. The analysis of its soil conservation function and its dynamic soil conservation effect may provide a scientific basis for local land spatial planning and soil and water conservation program design and policy management.[Methods]In this study, cropland, abandoned cropland, and converted forestland from 2000 to 2010 and 2000 to 2018 in the YHV was extracted using supervised classification and normalized difference vegetation index (NDVI) time series changes. Then,by using rainfall datasets, soil property, digital elevation model (DEM), annual maximum NDVI and land use datasets, the soil conservation in YHV from 2000 to 2018 was simulated and the soil conservation effect of cropland change was analyzed based on Universal Soil Loss Equation (USLE).[Results]1) From 2000 to 2018, the land use change in the YHV was mainlythe decrease of cropland (6.08%), the increase of construction land and forest(1.45% and 8.06%).The loss of cropland was principally transferred to grassland, forest and construction land, which were mostly distributed in Qianshan area, the edge of Naoshan areas and river valleys, indicating that the change of cropland in the YHV in recent years was greatly affected by the project of converting cropland to forest and urbanization.2) In the past 20 years, the amount of soil conservation has continued to increase.Forest and grassland had accounted for more than 84% of the total soil conservation in the study area.The transfer of cropland to grassland and cropland to forest both resulted in soil conservation benefits, and the later had higher value because it mostly distributed in the Naoshan area with better water resources.Moreover, the soil conservation benefit of the cropland transfer in the Naoshan area was better than that in the Qianshan area, while the soil conservation amount of the cropland transfer plots in the flat terrain area such as river valley and loess tableland was even lower than that of the cropland in the same area.[Conclusions]Using RS technology and USLE model, the distribution and change characteristics of land use and soil conservation in the YHV from 2000 to 2018 were quantitatively assessed. In the YHV, the soil conservation effect of cropland change is obvious, and it is greatly affected by terrain and water resources.It will be the direction of soil and water conservation management in the future to adjust the structure of cropland and abandoned cropland and ensure the stable and long-term providing of vegetation and soil conservation function.
程玉卓, 赵文婷, 焦菊英, 张丽萍, 曹雪, 陈同德, 李建军, 张子琦. 河湟谷地近20年耕地利用变化的土壤保持效应[J]. 中国水土保持科学, 2023, 21(1): 55-63.
CHENG Yuzhuo, ZHAO Wenting, JIAO Juying, ZHANG Liping, CAO Xue, CHEN Tongde, LI Jianjun, ZHANG Ziqi. Soil conservation effect of cropland use change in the Yellow River-Huangshui River Valley over the past 20 years. SSWC, 2023, 21(1): 55-63.
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2023, Vol. 21 
