Evaluation  of cultivated land quality in Xizang and Qinghai

REN Shuyi; SONG Changqing; YE Sijing; LIU Chenyu; WANG Kuangxu

doi:10.12202/j.0476-0301.2022361

Journal of Beijing Normal University(Natural Science) > 2024 > 60(1): 112-120. > DOI: 10.12202/j.0476-0301.2022361

REN Shuyi, SONG Changqing, YE Sijing, LIU Chenyu, WANG Kuangxu. Evaluation of cultivated land quality in Xizang and Qinghai[J]. Journal of Beijing Normal University(Natural Science), 2024, 60(1): 112-120. DOI: 10.12202/j.0476-0301.2022361

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Evaluation of cultivated land quality in Xizang and Qinghai

REN Shuyi^{1, 2,},
SONG Changqing^{1, 2, ,},
YE Sijing^{1, 2},
LIU Chenyu²,
WANG Kuangxu²

1.
State Key Laboratory of Earth Surface Processes and Resource Ecology，Beijing Normal University，Beijing，China
2.
Faculty of Geographical Science，Beijing Normal University，Beijing ，China

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Received Date: June 14, 2022
Accepted Date: June 14, 2022
Available Online: September 06, 2023

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Abstract

Abstract

Cultivated land quality in terms of soil properties and technical conditions in Xizang and Qinghai were evaluated, to identify dominant limiting factors and explore macroscopic influences, aiming to provide support to enhance productivity of cultivated land and ensure food security in plateau regions． The evaluation indicator weights are determined based on the combination of subjective and objective weightings, a random forest method is introduced to explore the influence of regional macronatural-economic-social factors． Cultivated land in Xizang and Qinghai is mainly medium land, accounting for 44.6% of the total area． Medium land is mostly sloping land in the Huangshui Valley area of Qinghai． The high slope of field surface restricts utilization as arable land． Elevation and distances to city centers have important effects on the cultivated land quality globally. In most areas, elevation and arable land quality show a negative correlation． The influence of distance to city on the cultivated land quality varies spatially． In the central and southern Xizang and frontier belt areas, high quality cultivated land is often laid out around cities due to improvement of technical conditions． In contrast, in the valley areas of the northeastern plateau, soil quality of arable land adjacent to urban periphery is lower and degradation is more likely to occur．
- cultivated land quality,
- Qinghai-Xizang Plateau,
- land use,
- randome forest(RF),
- GIS

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References (38)

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