过去百年青藏高原耕地时空变化及其对土壤保持功能的影响（英文）

编号 zgly0001584089

文献类型 期刊论文

文献题名 过去百年青藏高原耕地时空变化及其对土壤保持功能的影响（英文）

作者 李士成  王兆锋  张镱锂 

作者单位 KeyLaboratoryofLandSurfacePatternandSimulation  InstituteofGeographicSciencesandNaturalResourcesResearch(IGSNRR)  CAS  UniversityofChineseAcademyofSciences  SchoolofPublicAdministration  ChinaUniversityofGeosciences  CASCenterf 

母体文献 Journal of Geographical Sciences 

年卷期 2017年07期

年份 2017 

分类号 S15  F323.211 

关键词 croplandreconstruction  ecosystemservices  InVESTmodel  the20thcentury  Qinghaiprovince  theTibetAutonomousRegion 

文摘内容 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.