Interactive effects of changing precipitation and elevated CO2 concentration on photosynthetic parameters of Stipa breviflora

doi:10.3724/SP.J.1258.2012.00597

Abstract

Abstract:

Aims Stipa breviflora, which is a dominant species of desert steppe in the arid region of China, would be seriously affected by changes of precipitation and atmospheric CO₂ concentration. Our objective is to determine the interactive effects of changing precipitation and elevated CO₂ concentration on photosynthetic parameters of S. breviflora, in order to evaluate the effects of future climate change on the desert steppe.

Methods Open top chambers (OTCs) were used to simulate the elevated CO₂ concentration (control, 450, and 550 µmol·mol^-1) and changing precipitation (-30%, -15%, 0, +15% and +30%, based on the average monthly precipitation during 1978-2007). The photosynthetic parameters of S. breviflora were measured by a LI-6400 portable photosynthesis system.

Important findings The responses of photosynthetic parameters of S. breviflora to changes of CO₂ concentration and precipitation were significant, and interactive effects were observed. With increased CO₂, leaf net photosynthetic rate (P_n) of S. breviflora increased, and photosynthetic acclimation occurred during August. Stomatal conductance (G_s) and transpiration rate (T_r) decreased, and the increase of P_n was more than T_r. As a result, its water use efficiency (WUE) increased. With increased precipitation, P_n, G_s and T_r increased, and the increase of P_n was less than T_r, resulting in a decrease in WUE. Under higher CO₂ and 15% increase in precipitation, P_n, G_s and T_r of S. breviflora increased greatly, the increase of P_n was close to T_r, and consequently WUE did not change significantly.

Key words: changing precipitation, climatic change, desert steppe, elevated CO₂ concentration, photosynthetic parameter, Stipa breviflora

WANG Hui, ZHOU Guang-Sheng, JIANG Yan-Ling, SHI Yao-Hui, XU Zhen-Zhu. Interactive effects of changing precipitation and elevated CO₂ concentration on photosynthetic parameters of Stipa breviflora[J]. Chin J Plant Ecol, 2012, 36(7): 597-606.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2012.00597

https://www.plant-ecology.com/EN/Y2012/V36/I7/597

Figures/Tables 7

Table 1 Average monthly precipitation during 1978-2007 (30 years) and the irrigation amount every time

月份 Month	降水量 Precipitation (mm)	灌水量 Irrigation amount (mL)
月份 Month	降水量 Precipitation (mm)	-30%	-15%	对照 Control	+15%	+30%
6月 June	55.50	36	44	52	60	67
7月 July	92.73	55	67	79	90	102
8月 August	67.58	44	54	63	72	82

Fig. 1 Changes in leaf net photosynthetic rate (Pn) of Stipa breviflora under interactive CO2 concentration and precipitation (mean ± SE, n = 3). Different lowercases indicate significant difference between different precipitation treatments within the same CO2 concentration compared with control (p < 0.05); * indicates significant difference between higher CO2 concentration and ambient CO2 level within the same precipitation (p < 0.05).

Table 2 Variance analysis of photosynthetic parameters of Stipa breviflora between different CO2 concentration and precipitation treatment in June, 2011

变量 Variable	CO₂浓度 CO₂ concentration			降水量 Precipitation			交互作用 Interaction
变量 Variable	df	F	p	df	F	p	df	F	p
P_n	2	132.930	0.000	4	839.619	0.000	8	12.612	0.000
G_s	2	317.042	0.000	4	1 019.000	0.000	8	21.581	0.000
T_r	2	114.211	0.000	4	2 197.000	0.000	8	10.999	0.000
WUE	2	287.879	0.000	4	45.431	0.000	8	5.361	0.000

Table 3 Variance analysis of photosynthetic parameters of Stipa breviflora between different CO2 concentration and precipitation treatment in August, 2011

变量 Variable	CO₂浓度 CO₂ concentration			降水量 Precipitation			交互作用 Interaction
变量 Variable	df	F	p	df	F	p	df	F	p
P_n	2	129.269	0.000	4	1 004.000	0.000	8	23.829	0.000
G_s	2	123.647	0.000	4	692.882	0.000	8	10.718	0.000
T_r	2	24.938	0.000	4	219.511	0.000	8	2.495	0.033
WUE	2	6.809	0.004	4	39.515	0.000	8	8.595	0.000

Fig. 2 Changes in leaf stomatal conductance (Gs) of Stipa breviflora under interactive atmospheric CO2 concentration and precipitation (mean ± SE, n = 3). Notes see Fig. 1.

Fig. 3 Changes in leaf transpiration rate (Tr) of Stipa breviflora under interactive atmospheric CO2 concentration and precipitation (mean ± SE, n = 3). Notes see Fig. 1.

Fig. 4 Change in leaf water use efficiency (WUE) of Stipa breviflora under interactive atmospheric CO2 concentration and precipitation (mean ± SE, n = 3). +, increase; -, decrease. Notes see Fig.1.

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Interactive effects of changing precipitation and elevated CO₂ concentration on photosynthetic parameters of Stipa breviflora

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