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[1]Cai Dongdong,Dang Xiaohu,Zhao Shanglin,et al.Spatiotemporal variation and driving mechanisms of grassland NPP in farming-pastoral ecotone of the Loess Plateau from 1990 to 2020[J].Research of Soil and Water Conservation,2025,32(06):236-244,257.[doi:10.13869/j.cnki.rswc.2025.06.024]

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Spatiotemporal variation and driving mechanisms of grassland NPP in farming-pastoral ecotone of the Loess Plateau from 1990 to 2020

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 236-244,257 Column: Public date: 2025-10-20

Title:: Spatiotemporal variation and driving mechanisms of grassland NPP in farming-pastoral ecotone of the Loess Plateau from 1990 to 2020

Author(s):: Cai Dongdong¹,Dang Xiaohu²,Zhao Shanglin³,Qiu Fangting¹; (1.College of Geomatics,Xi'an University of Science and Technology,Xi'an 710054,China;2.College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China;3.Key Laboratory of Ecological Hydrology and Disaster Prevention in Arid Regions,Northwest Survey and Planning Institute of National Forestry and Grassland Administration,Xi'an 710048,China)

Keywords:: net primary productivity（NPP）; spatiotemporal dynamics; CASA model; optimal parameter-based geodetector; farming-pastoral ecotone of the Loess Plateau

CLC:: Q948

DOI:: 10.13869/j.cnki.rswc.2025.06.024

Abstract:: [Objective] To reveal the spatiotemporal evolution patterns of grassland net primary productivity (NPP) in the farming-pastoral ecotone of the Loess Plateau, clarify the interactive driving mechanisms between natural factors and human activities, and provide a theoretical basis for the scientific management and sustainable utilization of this region and other similar grassland ecosystems. [Methods] The CASA model was applied to simulate grassland NPP from 1990 to 2020. Trend analysis and the optimal parameter-based geodetector were used to identify the driving factors of spatiotemporal variation characteristics of grassland NPP. [Results](1) From 1990 to 2020, an overall increasing trend was observed in grassland NPP in the farming-pastoral ecotone of the Loess Plateau, with an annual average growth rate of 4.93 g C/(m²·a). The phased characteristics of grassland NPP were relatively distinct. From 1990 to 1999, grassland NPP exhibited an insignificant downward trend. It began to increase after 2000, with a significant rise observed during the period from 2011 to 2020.(2) From 1990 to 2020, the area where grassland NPP showed a significant increase accounted for 82.15%, while only 3.14% experienced a decrease, sporadically distributed in the Inner Mongolia Autonomous Region.(3) Grassland NPP exhibited a spatial differentiation pattern of higher in the southeast and lower in the northwest, primarily driven by precipitation and slope gradient, both of which generally exerted positive effects. The impacts of human activities were significantly amplified through nonlinear interactions among factors, with grazing, cropland expansion, and construction land expansion showing overall negative effects. However, with the increase of GDP per capita, ecological protection and technological investment mitigated the negative impact of these activities. [Conclusion] Grassland in the farmingpastoral ecotone of the Loess Plateau shows overall good restoration. In future grassland management, the influence of natural factors and differentiated moderate grazing policies should be considered to increase the income of farmers and herders, while balancing the trade-offs between direct(utilization of grassland productivity) and indirect beneficiaries(grassland regulating services) of the grassland ecosystems.

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Last Update: 2025-12-10