Land use and land cover change in Inner Mongolia - understanding the effects of China's re-vegetation programs

文献类型： 外文期刊

第一作者： Yin, He

作者： Yin, He;Pflugmacher, Dirk;Hostert, Patrick;Li, Ang;Li, Zhengguo;Hostert, Patrick

作者机构：

关键词： Land use and land cover change;Deforestation;Afforestation;Cropland retirement;MODIS time series;Trajectory-based approach;Inner Mongolia;Machine learning;Random forest;Probability scores

期刊名称：REMOTE SENSING OF ENVIRONMENT （ 影响因子：10.164； 五年影响因子：11.057 ）

ISSN： 0034-4257

年卷期： 2018 年 204 卷

页码：

收录情况： SCI

摘要： During the past decades, overuse of land resources has increasingly contributed to environmental crises in China. To mitigate wide-spread land degradation, actions have been taken to maintain and restore ecologically valuable landscapes such as natural forests. However, the effects of the various vegetation protection policies that have been implemented in China since the late 1990's still remain largely unknown. In this paper, we therefore focus on mapping land use and land cover change (LULCC) in Inner Mongolia, one of the key regions targeted by Chinese ecological restoration programs. We used 250-m MODIS time series and a random forest classification approach to generate annual probabilities for each land cover class between 2000 and 2014. We then applied a trajectory-based change detection approach based on a modified version of the Landsat-based detection of trends in disturbance and recovery (LandTrendr) algorithm to the probability time series and mapped land cover change trajectories. We found that our trajectory-based approach achieved high accuracies (overall accuracy 0.95 +/- 0.02). It provides spatial-temporal land change maps that allow a land-use related interpretation of change patterns. Our change maps show that i) forest loss decreased rapidly after 2000 (from 15,717 1770 ha in 2001 to 1313 165 ha in 2014) and forth gain (190,645 28,352 ha during 2001-2014) occurred in the ecological program zones, leading to a net forest increase in Inner Mongolia, and ii) cropland retirement (212,979 54,939 ha during 2001-2014) mostly occurred at the early stage of ecological programs and mainly concentrated in drier environments and steep terrain. Overall, land cover mapping and trajectory-based land use analyses allowed a consistent characterization of LULCC over large areas, which is crucial for gaining a better understanding of environmental changes in the light of rapidly changing environmental policies and governance regimes in China.

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