發(fā)布時(shí)間：2018-06-15 06:25

  本文選題：cropland + reconstruction　； 參考：《Journal of Geographical Sciences》2017年07期

【摘要】：Geographically explicit historical land use and land cover datasets are increasingly required in studies of climatic and ecological effects of human activities. In this study, using historical population data as a proxy, the provincial cropland areas of Qinghai province and the Tibet Autonomous Region(TAR) for 1900, 1930, and 1950 were estimated. The cropland areas of Qinghai and the TAR for 1980 and 2000 were obtained from published statistical data with revisions. Using a land suitability for cultivation model, the provincial cropland areas for the 20 th century were converted into crop cover datasets with a resolution of 1 × 1 km. Finally, changes of sediment retention due to crop cover change were assessed using the sediment delivery ratio module of the Integrated Valuation of Ecosystem Services and Trade-offs(InVEST) model(version 3.3.1). There were two main results.(1) For 1950 1980 the fractional cropland area increased from 0.32% to 0.48% and land use clearly intensified in the Tibetan Plateau(TP), especially in the Yellow River Huangshui River Valley(YHRV) and the midstream of the Yarlung Zangbo River and its two tributaries valley(YRTT). For other periods of the 20 th century, stability was the main trend.(2) For 1950 1980, sediment export increased rapidly in the Minhe autonomous county of the YHRV, and in the Nianchu River and Lhasa River basins of the YRTT, which means that sediment retention clearly decreased in these regions over this period. The results of this assessment provide scientific support for conservation planning, development planning, or restoration activities.
[Abstract]:Geographically explicit historical land use and land cover datasets are increasingly required in studies of climatic and ecological effects of human activities. In this study, using historical population data as a proxy, the provincial cropland areas of Qinghai province and the Tibet Autonomous region for 1900, 1930, and 1950 were estimated. The cropland areas of Qinghai and the TAR for 1980 and 2000 were obtained from published statistical data with revisions. Using a land suitability for cultivation model, the provincial cropland areas for the 20 th century were converted into crop cover datasets with a resolution of 1 脳 1 km. Finally, changes of sediment retention due to crop cover change were assessed using the sediment delivery ratio module of the Integrated valuation of ecosystem Services and Trade-offs model(version 3.1. There are were two main results. 1) for 1980 the fractional cropland area increased from 1980 the fractional cropland area increased from 0.32% to 0.48% and land use clearly intensified in the Tibetan PlateauTPN, especially in the Yellow River Huangshui River ValleyYHRV. and the midstream of the Yarlung Zangbo River and its two tributaries valley. For other periods of the 20 th century, stability was the main trend.for 1950, sediment export increased rapidly in the minor autonomous county of the YHRV, and in the Nianchu River and Lhasa River basins of the YRTT, which means that sediment retention clearly decreased in these regions over this period. The results of this assessment provide scientific support for conservation planning, development planning, or restoration activities.
【作者單位】： Key
【基金】：Strategic Priority Research Program of the Chinese Academy of Sciences,No.XDB03030500 National Natural Science Foundation of China,No.41371120 The Key Foundation Project of Basic Work of the Ministry of Science and Technology of China,No.2012FY111400
【分類號(hào)】：S15;F323.211

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本文編號(hào)：2021027