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Article
Global gross primary productivity and water use efficiency changes under drought stress
Environmental Research Letters
  • Zhen Yu, Iowa State University
  • Jingxin Wang, West Virginia University
  • Shirong Liu, Chinese Academy of Forestry
  • James S. Rentch, West Virginia University
  • Pengsen Sun, Chinese Academy of Forestry
  • Chaoqun (Crystal) Lu, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
1-17-2017
DOI
10.1088/1748-9326/aa5258
Abstract

Drought can affect the structure, composition and function of terrestrial ecosystems, yet drought impacts and post-drought recovery potentials of different land cover types have not been extensively studied at a global scale. We evaluated drought impacts on gross primary productivity (GPP), evapotranspiration (ET), and water use efficiency (WUE) of different global terrestrial ecosystems, as well as the drought-resilience of each ecosystem type during the period of 2000 to 2011. Using GPP as biome vitality indicator against drought stress, we developed a model to examine ecosystem resilience represented by the length of recovery days (LRD). LRD presented an evident gradient of high (>60 days) in mid-latitude region and low (<60 days) in low (tropical area) and high (boreal area) latitude regions. As average GPP increased, the LRD showed a significantly decreasing trend, indicating readiness to recover after drought, across various land cover types (R 2 = 0.68, p < 0.0001). Moreover, zonal analysis revealed that the most dramatic reduction of the drought-induced GPP was found in the mid-latitude region of the Northern Hemisphere (48% reduction), followed by the low-latitude region of the Southern Hemisphere (13% reduction). In contrast, a slightly enhanced GPP (10%) was evident in the tropical region under drought impact. Additionally, the highest drought-induced reduction of ET was found in the Mediterranean area, followed by Africa. Water use efficiency, however, showed a pattern of decreasing in the Northern Hemisphere and increasing in the Southern Hemisphere. Drought induced reductions of WUE ranged from 0.96% to 27.67% in most of the land cover types, while the increases of WUE found in Evergreen Broadleaf Forest and savanna were about 7.09% and 9.88%, respectively. These increases of GPP and WUE detected during drought periods could either be due to water-stress induced responses or data uncertainties, which require further investigation.

Comments

This article is published as Yu, Z.*, J. Wang, S. Liu, J.S. Rentch, P. Sun, and C. Lu. 2017. Global gross primary productivity and water use efficiency changes under drought stress. Environmental Research Letters, 12(1), p.014016. Doi: 10.1088/1748-9326/aa5258.

Creative Commons License
Creative Commons Attribution 3.0
Copyright Owner
IOP Publishing
Language
en
File Format
application/pdf
Citation Information
Zhen Yu, Jingxin Wang, Shirong Liu, James S. Rentch, et al.. "Global gross primary productivity and water use efficiency changes under drought stress" Environmental Research Letters Vol. 12 Iss. 1 (2017) p. 014016
Available at: http://0-works.bepress.com.library.simmons.edu/chaoqun_lu/43/