Massive forest lands, up to 61%, were converted to agricultural land in particular in the last decade. The conversion was mostly done by smallholders and by hand for annual upland crops farming which was quantified up to 80% of total converted land. The lost of forest is confirmed by the negative value NDVI all over the studied area from 2000-2010.
Maimaitijiang, M., et al. (2015). "Drivers of land cover and land use changes in St. Louis metropolitan area over the past 40 years characterized by remote sensing and census population data." International Journal of Applied Earth Observation and Geoinformation 35, Part B: 161-174.
Nalin S., Keo M., Lal S., and Manzul K. H. (2010). Land use/land cover change detection of Tonle sap watershed, Cambodia. In “31st Asian Conference on Remote Sensing 2010” conference proceeding page 852-857. Hanoi, 1-5 November 2010. The Asian Association on Remote Sensing, Tokyo.