EGU21-5111, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-5111
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Estimation of aboveground plant water storage using Sentinel-2 images in a semi-arid area

Liang Liu1, Shaoda Li1, Xinrui Luo1, Wunian Yang1,2, Yuhang Zhang1, Junjie Lei1, Guo Chen2, and Xiaolu Tang2
Liang Liu et al.
  • 1College of Earth Science, Chengdu University of Technology, Chengdu , China (liuliang_cdut@163.com)
  • 2College of Ecological and Environment, Chengdu University of Technology, Chengdu , China (lxtt2010@163.com)

Aboveground plant water storage (APWS), the total of water storing in aboveground parts of plant, has the function of sustaining the balance between water loss by transpiration and water gain of root uptake. APWS is also essential for plants and hydrological cycle, particularly for semi-arid areas, where water availability is limited. However, APWS varies spatially due to the heterogeneity of natural areas that are composed of a large variety of vegetation types, and studies on the spatial variability of APWS are quite limited in semi-arid areas. To fill this knowledge gap, we established 55 inventory plots with 36 plots in forests and 19 plots in shrubs to detect the spatial variability of APWS using a Random Forest (RF) algorithm and Sentinel-2 images in Mao County, China. Field observations indicated that APWS varied significantly with ecosystems, with the highest APWS in forests. Regardless of ecosystem type, mean APWS in Mao Country was 117.63 Mg ha-1. 10-fold cross-validation suggested that the RF model could reasonably predict APWS (model efficiency = 0.68, root mean square error = 54 Mg ha-1), enabling to capture the spatial variability of APWS. A robust spatial variability of APWS was observed with the highest APWS in forests located high altitude areas, while the lowest APWS was found in shrubs located in low altitude areas. Total APWS was 3.39×107 Mg across the whole study area, which could be used as a valuable natural resource for the semi-arid area. Our study successfully explored the spatial variability of APWS, suggesting the capability of detecting APWS using Sentinel-2 and providing essential data evidence for environmental protection for semi-arid areas.

How to cite: Liu, L., Li, S., Luo, X., Yang, W., Zhang, Y., Lei, J., Chen, G., and Tang, X.: Estimation of aboveground plant water storage using Sentinel-2 images in a semi-arid area, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5111, https://doi.org/10.5194/egusphere-egu21-5111, 2021.

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