The expansion of tree-based boom crops in mainland Southeast Asia: 2001 to 2014
The expansion of tree-based boom crops in mainland Southeast Asia: 2001 to 2014
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DOI：
10.1080/1747423x.2018.1499830
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发表时间：
2018-01-01
影响因子：
3.2
通讯作者：
Fox, Jefferson
中科院分区：
文献类型：
--
作者：
Hurni, Kaspar;Fox, Jefferson
在过去的半个世纪里，东南亚大陆(MSEA)的国家--柬埔寨、老挝、缅甸、泰国和越南--见证了商业化农业的增长，蓬勃发展的农作物种植园迅速扩张。我们使用2001-2014年的MODIS EVI和SWIR时间序列对MSEA的树木覆盖变化进行分类，并通过从现有的陆地卫星分类中提取样本，使用提升尺度方法执行监督变化检测。我们使用随机森林分类器对24个类别(16个代表繁荣作物)进行了分类，准确率为82.2%。欣欣向荣的作物占据了约18%的土地(其中8%是橡胶)。自2003年以来，种植了74,960公里(2)橡胶；70%的橡胶种植在以前的林地上，30%种植在低植被地区(主要是以前的农田)。然而，时间、变化模式和森林砍伐率在MSEA国家之间有所不同，我们分类的高度空间和时间细节使我们能够量化动态并讨论变化的政治和社会经济驱动因素。
Over the past half century, countries of Mainland Southeast Asia (MSEA) Cambodia, Laos, Myanmar, Thailand, and Vietnam - have witnessed increases in commercialized agriculture with rapid expansions of boom crop plantations. We used MODIS EVI and SWIR time-series from 2001-2014 to classify tree cover changes across MSEA and performed a supervised change detection using an upscaling approach by deriving samples from existing Landsat classifications. We used the random forest classifier and distinguished 24 classes (16 representlng boom-crops) with an accuracy of 82.2%. Boom-crops occupy about 18% of the landscape (8% of which is rubber). Since 2003 74,960 km(2) of rubber have been planted; 70% of rubber is planted on former forest land, and 30% on low vegetation area (mainly former croplands). Timing, patterns of change, and deforestation rates, however, differ among the MSEA countries and the high spatial and temporal detail of our classification allowed us to quantify dynamics and discuss political and socio-economic drivers of change.