干旱区研究

Arid Zone Research >

2025 , Vol. 42 >Issue 11: 2127 - 2141

DOI: https://doi.org/10.13866/j.azr.2025.11.15

Agricultural Ecology

Spatiotemporal evolution and driving factors of cultivated land in the Hehuang Valley derived from topographic gradient data

  • ZHOU Jianwei ,
  • ZHANG Zelin ,
  • WU Hua ,
  • KONG Xiangyun ,
  • CHEN Xingwang
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  • 1. School of Ecology and Environment, Xizang University, Lhasa 850000, Xizang, China
    2. Joint Laboratory of Plateau Surface Remote Sensing, Xizang University, Lhasa 850000, Xizang, China
    3. School of Engineering, Xizang University, Lhasa 850000, Xizang, China

Received date: 2025-05-21

  Revised date: 2025-09-19

  Online published: 2025-12-13

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Abstract

Sustainable utilization of cultivated land in the Hehuang Valley, a core grain-production area in the northeastern margin of the Qinghai-Xizang Plateau, is crucial for guaranteeing regional food security and ecological security protection. Utilizing long-term high-resolution land use data from 1980 to 2020, we integrate a topographic gradient analysis, kernel density estimation, the PLUS model, and standard deviational ellipse theory to quantify the temporal dynamics, spatial agglomeration characteristics, topographic differentiation, and driving factors of cultivated land changes in the region. The results revealed (1) a net loss of 119.24 km2 of cultivated land in the Hehuang Valley from 1980 to 2020. Most of the lost land was converted to grassland, water area, and built-up areas. (2) A distinct spatial pattern emerged, revealing a high cultivation density in the river valleys and a sparse distribution in mountainous zones. The spatial centroid shifted 2.277 km northwestward, accompanied by progressive spatial contraction. (3) The cultivated land was concentrated on the sunlit slopes of hills and plains below 2772 m altitude, where the slope gradient is 15° and human activities have significantly changed the land use. (4) The population density dominantly drives the changes in cultivated land area, with a contribution degree reaching 0.11, followed by distance to railway, annual average wind speed, altitude, and gross domestic product per unit area. The cultivated land has expanded along the Datong River and Yellow River corridors, contrasting with rapid contraction in the Huangshui River section of Xining. Topographic gradients significantly regulate the spatiotemporal patterns of cultivated land dynamics in the Hehuang Valley. Location-specific management strategies are imperative for optimizing the resource allocation and ensuring sustainable agricultural development under heterogeneous environmental constraints.

Key words： cultivated land; topographic gradient; driving factors; PLUS model; Hehuang Valley

Cite this article

ZHOU Jianwei , ZHANG Zelin , WU Hua , KONG Xiangyun , CHEN Xingwang . Spatiotemporal evolution and driving factors of cultivated land in the Hehuang Valley derived from topographic gradient data[J]. Arid Zone Research, 2025 , 42(11) : 2127 -2141 . DOI: 10.13866/j.azr.2025.11.15

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