Abstract
Due to the policy of balancing the occupation and compensation of cultivated land and uneven regional economic development in China, the cultivated land tends to move from developed area to undeveloped area. China’s undeveloped regions are mainly located in the west, where the climate is more arid and the soil is more barren, and more agrochemical inputs such as fertilizers and mulch films are needed to ensure grain production. Therefore, the westward shift of cultivated land may bring about even faster westward shift of agricultural chemicals, which poses great danger to the already fragile ecological environment in the western region. However, the current research mainly focuses on the spatio-temporal changes of cultivated land, and the research on the environmental effect brought by the spatial movement of cultivated land is still lacking. Based on the cultivated land data and corresponding agrochemical inputs at the provincial level from 2000 to 2020, spatio-temporal statistical models were used to analyze the evolution of cultivated land distribution patterns and the super-environmental effect. The following results were found: (1) the gravity centers of China’s cultivated land area moved to the northwest, with corresponding average annual moving speeds of 1.67 km year−1 during the study period; (2) the gravity centers of agrochemical inputs were also moved westward or north-westward and showed even higher speeds than that of cultivated land area, i.e., mulch film (14.93 km year−1) > fertilizer (6.69 km year−1) > pesticide (5.59 km year−1) > agricultural diesel (3.78 km year−1) > cultivated land area (1.67 km year−1); (3) it was revealed from the spatio-temporal double-difference modeling that the westward shift of cultivated land distribution patterns had increased the relative agrochemical inputs per area in the west, which explained why the westward shift of agrochemical inputs was faster than that of cultivated land. This study has enriched the existing ecological policy evaluation methods theoretically, revealed the super-environmental effect brought by the westward shift of cultivated land patterns under the current policy background, and confirmed that the westward shift of cultivated land will bring the pressure of agricultural non-point source pollution to the western region, which may lead to the destruction of the ecological environment in the western region. In practice, it can provide a decision-making reference for rational agrochemical inputs in the process of grain cultivation and protection of agricultural ecological environment in western China.
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Acknowledgements
Great thanks to Prof. Shougeng Hu and Han Zhang, thank them for their assistance in methodology.
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This study benefited from joint financial support by the National Natural Science Foundation of China (No. 42071416) and Key Research & Development Plan of Ningxia Hui Autonomous Region (No. 2021BEG03001).
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CW and DZ conceived the study, and the authors have thanked all persons who contributed to the study.
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Wang, C., Zhang, D. The super-environmental effect of the westward shift of China’s cultivated land patterns. Environ Earth Sci 82, 572 (2023). https://doi.org/10.1007/s12665-023-11265-8
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DOI: https://doi.org/10.1007/s12665-023-11265-8