Effects of simulated warming and precipitation enhancement on photosynthesis of Stipa krylovii

doi:10.11686/cyxb2015163

Abstract

Abstract: This study was conducted to examine the interactive effects of climate warming and changing precipitation on photosynthetic parameters of Stipa krylovii to evaluate the effects of future climate change on a typical steppe environment. Open top chambers (OTCs) were used to simulate warming +2℃, based on the local temperature increase from 1961 to 2010 (IPCC, 2007) and precipitation enhancement of +20%, based on the local average monthly precipitation from 1961-2010. The photosynthetic parameters were measured by a portable gas exchange system (LI-6400) in the growing season of 2012. Warming significantly reduced the photosynthetic rate (P_n) and stomatal conductance (G_s) of S. krylovii, and there was a clear seasonal trend. Warming reduced P_n 17% and 27% and reduced G_s by 24% and 32% in July and September, respectively. Warming also reduced the transpiration rate (T_r), chlorophyll content, the maximum ribulose 1,5-bisphosphate (RuBP) carboxylation rate (V_c_max), RuBP regeneration capacity (J_max), apparent quantum efficiency (AQE) and the maximum photosynthetic rate (P_n_max) of S. krylovii. Conversely, water use efficiency (WUE) increased by 16.5%. Precipitation enhancement produced compensatory effects on photosynthesis responses to warming. Precipitation enhancement promote P_n, G_s, T_r, chlorophyll content, V_c_max, J_max, AQE and the P_n_max of S. krylovii but had did not affect WUE. The effects of temperature and precipitation on photosynthesis and WUE of S. krylovii was caused by stomatal and non-stomatal factors. Under warm conditions and precipitation enhancement, G_s influenced both P_n and T_r. No interactive effects were observed.

YAN Yu-Long, ZHANG Li-Xin, WAN Zhi-Qiang, GU Rui, SU Li-De, YANG Jie, GAO Qing-Zhu. Effects of simulated warming and precipitation enhancement on photosynthesis of Stipa krylovii[J]. Acta Prataculturae Sinica, 2016, 25(2): 240-250.

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