EGU21-15731
https://doi.org/10.5194/egusphere-egu21-15731
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Mapping present-day mountain treeline pattern based on high-resolution remote sensing images

Xinyue He1,2, Zhenzhong Zeng2, Dominick Spracklen1, Joseph Holden3, and Alan D. Ziegler4
Xinyue He et al.
  • 1School of Earth and Environment, University of Leeds, Leeds, UK (eexhe@leeds.ac.uk)
  • 2School of Environment Science and Engineering, Southern University of Science and Technology, Shenzhen, China
  • 3School of Geography, University of Leeds, Leeds, UK
  • 4Faculty of Fisheries and Aquatic Resources, Mae Jo University, Chiang Mai, Thailand

Mountain forests, widely distributed around the world, are hotspots of biodiversity and provide important environmental services by conserving water and soil, regulating river flow and storing carbon. The upper altitudinal limits of trees is defined as the treeline. Some field investigations indicate that treelines around the world are moving upward as a response to global climate change. However, to date, a high-resolution spatial map of global mountain treeline position is still lacking. In this study, we develop an algorithm to detect the present-day tree line positions in mountain regions globally, via integrating a high-resolution tree distribution dataset with a high-resolution digital elevation model. The results are validated with even finer resolution remote sensing images in Google Earth. We analyse a range of climate datasets to understand important climate drivers of the present-day tree line position. Further, we explore the change in Normalized Difference Vegetation Index (NDVI) within the buffer zone of the treeline to determine how the treeline position has shifted in the last three decades. By providing the first global mountain treeline distribution, our analysis will help to reveal how mountain forests are responding to climate change globally, and to detect how the responses vary regionally.

How to cite: He, X., Zeng, Z., Spracklen, D., Holden, J., and Ziegler, A. D.: Mapping present-day mountain treeline pattern based on high-resolution remote sensing images, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15731, https://doi.org/10.5194/egusphere-egu21-15731, 2021.

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