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Highland cropland expansion and forest loss in Southeast Asia in the twenty-first century


Southeast Asia is a hotspot of tropical deforestation for agriculture. Most of the deforestation is thought to occur in lowland forests, whereas the region’s mountainous highlands undergo very limited deforestation. However, regional reports of cropland expansion in some highland areas suggest that this assumption is inaccurate. Here we investigate patterns of forest change and cropland expansion in the region for the twenty-first century, based on multiple streams of state-of-the-art satellite imagery. We find large increases in cultivated areas that have not been documented or projected. Many of these cultivated areas have evolved from forests that vary in health and status, including primary and protected forests, or from recovering lands that were on a trajectory to become secondary forests. These areas all have different biophysical features than croplands. We estimate that an area of 82 billion m2 has been developed into croplands in the Southeast Asian highlands. Some portion of this land-use change is probably attributable to agricultural intensification on formerly swidden agriculture lands; however, a substantial proportion is from new forest loss. Our findings are in marked contrast with projections of land-cover trends that currently inform the prediction of future climate change, terrestrial carbon storage, biomass, biodiversity, and land degradation.

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Fig. 1: Cropland expansion along topographical frontiers in the twenty-first century in Nan province, Thailand.
Fig. 2: Spatial pattern and magnitude of net forest loss in SEA during the early twenty-first century.
Fig. 3: Spatial pattern of cropland expansion in SEA during the early twenty-first century.
Fig. 4: Evaluation on the spatial pattern of cropland expansion and forest change in SEA during the early twenty-first century for various products.

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This study was supported by Lamsam-Thailand Sustain Development (B0891). We thank Della Research Computing in Princeton University for providing computing resources. We thank CMIP for providing the IPCC global land-cover change forcing; J. Chen, D.-H. Kim and Hansen/UMD/Google/USGS/NASA for providing the moderate- and high-resolution satellite land-use/cover products; the Planet Lab and Google Earth for providing high-resolution satellite imagery; and the KASIKORN Foundation for data collection in the Nan province, Thailand. We also thank M. Pan and D. Gower for useful comments.

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Z.Z. and E.F.W. designed the research. Z.Z. performed analysis. Z.Z., L.E. and A.D.Z. wrote the draft, and all authors contributed to the interpretation of the results and writing of the paper.

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Correspondence to Zhenzhong Zeng.

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Zeng, Z., Estes, L., Ziegler, A.D. et al. Highland cropland expansion and forest loss in Southeast Asia in the twenty-first century. Nature Geosci 11, 556–562 (2018).

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