abandoned land

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Soil Heavy Metal Pollution and Health Risk Assessment of Abandoned Land in Coal Mining Areas in Xingren County

Meteorological and Environmental Research

The exploitation of mineral resources has become an im-portant source of soil pollution from heavy metals[1-2],and theexploitation and processing of mineral resources have made avariety of associated heavy metal elements being released tothe surface environment,thereby damaging soil ecosystem andhuman health seriously in the mining areas[3-4].In XingrenCounty,Guizhou Province,a typical coal-burning type of arse-nic p... (本文共7页) 阅读全文>>

Effect of Hillslope Gradient on Vegetation Recovery on Abandoned Land of Shifting Cultivation in Hainan Island,South China

Journal of Integrative Plant Biology

Shifting eultivation or slash一and一burn agrieulture 15 a wide- sPread form of land use that exists in almost all troPieal regions (Brady 1996;HauserandNorgorver2001).ltisoneofthemain eauses of annual troPieal deforestation(Riehards 1996)and aeeounts for 35%in all New World，70%in Afriea and 49%in Asia(Whitmore 1998).IntheProeessofshiftingeultivation，all vegetation 15 slashed and almost no remnant trees are left，exeePt ... (本文共12页) 阅读全文>>

基于决策树与时序NDVI变化检测的耕地撂荒遥感监测——以四川省凉山州普格县为例

山地学报

撂荒地是土地覆盖/土地覆盖变化研究的重要方向之一[1-2]。我国撂荒地最早出现于20世纪80年代中后期；90年代以后，耕地撂荒问题日趋严重[3]。农村人口不断流失是造成撂荒地的主要原因，耕地被污染和破坏、耕地贫瘠、自然灾害导致耕地无法再利用等也容易形成耕地撂荒。研究表明[4]:撂荒现象在川西、贵州毕节、宁夏南部、重庆等山区较为突出，部分地区季节性撂荒甚至高达80%。近10年来，我国耕地撂荒面积呈增加趋势，已上升至总耕地面积的15%～30%[5],严重威胁到国家18亿亩的耕地红线和粮食安全[6-8],同时也会对生物多样性、土壤质量和生态环境等产生不同程度的影响[9-12]。因此，监测撂荒地空间变化及其分布特征，对实施乡村振兴战略、遏制区域耕地撂荒、改善地区生态环境具有科技支撑作用。实地调查是撂荒地提取的传统方法，但该方法费时费力，难以在大尺度上推广，不利于长期监测。近年来，遥感技术用于土地资源动态监测，已经成为撂荒地提取的重要方法... (本文共10页) 阅读全文>>