Preprints
https://doi.org/10.5194/bg-2022-50
https://doi.org/10.5194/bg-2022-50
 
15 Mar 2022
15 Mar 2022
Status: this preprint is currently under review for the journal BG.

Excess radiation exacerbates drought stress impacts on stomatal conductance along aridity gradients

Jing Wang1 and Xuefa Wen1,2,3 Jing Wang and Xuefa Wen
  • 1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
  • 2College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, China
  • 3Beijing Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing, 101408, China

Abstract. Stomatal conductance (gs) of all co-existing species regulates transpiration in arid and semi-arid grasslands prone to droughts. However, the effect of drought stress on gs is debated, and the interaction effects of abiotic and biotic constraints on canopy gs remain poorly understood. Here, we used Abstract. Stomatal conductance (gs) of all co-existing species regulates transpiration in arid and semi-arid grasslands prone 18O enrichment of leaf organic matter above source water (△18O) as proxy for gs per leaf area to increase understanding of these effects. Three grassland transects were established along aridity gradients in Loess Plateau (LP), Inner Mongolian Plateau (MP), and Tibetan Plateau (TP) which differ in radiation and temperature conditions. Results showed that canopy gs consistently decreased with increasing aridity within transects. The order of gs at a given aridity index was LP>MP>TP, due to suppressed effects of excess radiation and low temperatures among transects. Primary determinant of drought stress on gs was soil moisture (SM) in LP and MP, and vapor pressure deficit (VPD) in TP. Radiation exhibited consistently negative effect on gs via drought stress within transects, while temperature had positive effects on gs in LP, no effects in MP, and negative effects in TP. Adding the interaction of leaf area and abiotic factors increases the percent of explained variability in gs by 17 and 36 % in LP and MP, respectively, but not in TP due to an overwhelming effect of climate. The results highlighted the need to integrate multiple stressors and plant properties to determine spatial variability in gs.

Jing Wang and Xuefa Wen

Status: open (until 22 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on bg-2022-50', Yakun Tang, 29 Apr 2022 reply
  • CC2: 'Comment on bg-2022-50', Zhaoguo Wang, 29 Apr 2022 reply
  • RC1: 'Comment on bg-2022-50', Anonymous Referee #1, 01 May 2022 reply

Jing Wang and Xuefa Wen

Jing Wang and Xuefa Wen

Viewed

Total article views: 295 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
245 38 12 295 54 5 4
  • HTML: 245
  • PDF: 38
  • XML: 12
  • Total: 295
  • Supplement: 54
  • BibTeX: 5
  • EndNote: 4
Views and downloads (calculated since 15 Mar 2022)
Cumulative views and downloads (calculated since 15 Mar 2022)

Viewed (geographical distribution)

Total article views: 266 (including HTML, PDF, and XML) Thereof 266 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Discussed

Latest update: 26 May 2022
Download
Short summary
Excess radiation and low temperature exacerbate drought impacts on stomatal conductance (gs) among transects. Primary determinant of drought on gs was soil moisture in Loess Plateau (LP) and Mongolian Plateau (MP), and vapor pressure deficit in Tibetan Plateau (TP). Radiation exhibited negative effect on gs via drought within transects, while temperature had positive effects on gs in LP, no effects in MP, and negative effects in TP.
Altmetrics