Chinese Journal of Agrometeorology ›› 2023, Vol. 44 ›› Issue (12): 1079-1090.doi: 10.3969/j.issn.1000-6362.2023.12.001

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Spatiotemporal Dynamics of Farmland Ecological Assets Quality in Qinghai-Tibet Plateau

LIU Wen-min, HU Guo-zheng, LI Yue-mei, GAO Qing-zhu, HASBAGAN Ganjurjav, WU Ri-han, YU Pei-dong, LI Ming-jie   

  1. 1.College of Agriculture and Animal Husbandry, Qinghai Univerisity, Xining 810000,China; 2.Institute of Agricultural Environment and Sustainable Development/National Agricultural Environmental Data Center, Chinese Academy of Agricultural Sciences, Beijing 100081; 3.Key Laboratory of Agricultural and Rural Ecology and Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081; 4.Academy of Agricultural and Forestry Sciences, Qinghai Univerisity, Xining 810000; 5.Xining Agricultural Environmental Science Observation Experiment Station, Ministry of Agriculture and Rural Affairs, Xining 810000
  • Received:2023-02-07 Online:2023-12-20 Published:2023-11-15

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Abstract: Based on remote sensing data, authors revealed the characteristics of farmland ecological assets quality on the Qinghai-Tibet Plateau from 2000 to 2020 by the methods of pixel dichotomy model, normalization processing, transfer matrix. Then, this study analyzed the trends of farmland ecological assets quality in different provinces and the transformation between each quality. The results show that: (1) From 2000 to 2020, the spatial pattern of farmland ecological assets quality on the Qinghai-Tibet Plateau was high in the southeast and low in the northwest. The main quality was at the middle level, accounting for 48% of the total farmland area, distributing in the Eastern Qinghai-Tibet Plateau. The area ratio of excellent, good, low and poor farmland ecological assets quality were 6.6%, 15.2%, 27.4% and 2.8% respectively. (2) The farmland ecological assets quality increased both on the Qinghai-Tibet Plateau and in each province, with average improvement rates of 0.237, 0.039, 0.224, 0.098, 0.098, 0.282 and 0.134 per 5 years in Qinghai, Tibet Autonomous Region, Gansu, Sichuan, Yunnan, Xinjiang Uygur Autonomous Region and Qinghai-Tibet Plateau respectively. (3) The farmland ecological assets quality on the Qinghai-Tibet Plateau gradually improved. From 2000 to 2020, the area of improved quality was larger than degraded area quinquennial. (4) The including of the soil and terrain asset quality could offset the overestimation of farmland ecological assets quality solely represented by plant asset quality. The proportion of ecological asset quality of medium and low-grade farmland on the Qinghai-Tibet Plateau increased, while the proportion of farmland with excellent, good and poor grades decreased. This study provides experiences for the quality accounting of ecological assets in other regions, and a scientific basis for the sustainable development and management of farmland ecological assets on the Qinghai-Tibet Plateau.

Key words: Qinghai-Tibet Plateau, Quality of ecological assets of farmland, Evaluation methods, Spatial and temporal variation