Preprints
https://doi.org/10.5194/hess-2020-242
https://doi.org/10.5194/hess-2020-242

  29 Jun 2020

29 Jun 2020

Review status: a revised version of this preprint is currently under review for the journal HESS.

Assessing the large-scale plant-water relations using remote sensing products in the humid subtropical Pearl River Basin in south China

Hailong Wang1,2,3, Kai Duan1,2,3, Bingjun Liu1,2,3, and Xiaohong Chen1,2,3 Hailong Wang et al.
  • 1School of Civil Engineering, Sun Yat-sen University, Guangzhou, Guangdong, China, 510275
  • 2Guangdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China, Sun Yat-sen University, Guangzhou, China, 510275
  • 3Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, Guangdong, China, 519082

Abstract. Vegetation interact closely with water resources. Conventional studies of plant-water relations at the field scale are fundamental for understanding the mechanisms of how plants alter and adapt to environmental changes, while large-scale studies can be more practical for regional land use and water management towards mitigating climate change impacts. In this study, we investigated the changes in total water storage (TWS), aridity index (AI) and vegetation greenness, productivity and their interactions in the Pearl River Basin since 2002. Results show overall increase of TWS especially in the middle reaches where vegetation greenness and productivity also increased. This region dominated by croplands was identified as the hotspot for changes and interactions between water and vegetation in the basin. Vegetation was more strongly affected by TWS than precipitation (P) at both the annual and monthly scales. Further examination showed that the influence of P on vegetation in wet years was stronger than dry years, while the TWS impact was stronger in dry years than wet years; moreover, greenness responded faster and productivity slower to dryness changes in dry years than wet years. The lag effects resulted in nonlinearity between water and vegetation. This study implies that vegetation in the basin uses rainwater prior to water storage until it gets dry, and the degree of water restriction on vegetation was higher than that of water consumption by vegetation even in this rain-abundant region.

Hailong Wang et al.

 
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Hailong Wang et al.

Hailong Wang et al.

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