Threshold effects of photosynthetic and physiological parameters in Prunus sibirica to soil moisture and light intensity

doi:10.3724/SP.J.1258.2011.00322

Abstract

Abstract:

Aims Our objective was to investigate the threshold effects of photosynthetically active radiation (PAR) and soil mass water content (W_m) on photosynthetic and physiological parameters of Prunus sibirica, and understand the adaptability of P. sibirica to light and soil moisture conditions. We determined optimal W_m and PAR for P. sibirica to maintain higher net photosynthetic rate (P_n) and water use efficiency (WUE).
Methods Using CIRAS-2 portable photosynthesis system, we measured P_n, transpiration rate (T_r), WUE and other photosynthetic and physiological parameters of three-year-old P. sibirica under different soil moisture conditions.
Important findings P_n, T_r and WUE of P. sibirica had the critical response to soil moisture content and PAR. With increases in W_m (6.5%-18.6%), the light compensation point decreased and light saturation point, apparent quantum yield and maximum P_n increased. When W_m was about 18.6%, the low and high light use efficiency of P. sibirica was maximal. The index of P_n, T_r obviously increased with increasing W_m (9.2% to 18.6%), but P_n, T_rdecreased when W_m was too high or low. When PAR ranged from 800 to 1 200 µmol∙m^-2∙s^-1, P_n and WUE were higher and the light saturation points of P_n and WUE were from 983 to 1 365 µmol∙m ^-2∙s^-1. These indicated that P. sibirica possessed higher adaptability to light conditions. Based on photosynthetic and physiological parameters, the soil water availability and productivity of P. sibirica were classified and evaluated. For P. sibirica woodland, < 9.2% or >22.3% were low productivity and middle WUE, 20.5%-22.3% was middle productivity and low WUE, 9.2%-12.9% of W_m was middle productivity and middle WUE and 12.9%-20.5% of W_mwas high productivity and high WUE. The optimum high productivity and high WUE of W_m were about 18.6%, and the corresponding optimum PAR was about 1 365 µmol∙m ^-2∙s^-1.

Key words: net photosynthetic rate, Prunus sibirica, soil water availability, threshold effect, water use efficiency

XIA Jiang-Bao, ZHANG Guang-Can, SUN Jing-Kuan, LIU Xia. Threshold effects of photosynthetic and physiological parameters in Prunus sibirica to soil moisture and light intensity[J]. Chin J Plant Ecol, 2011, 35(3): 322-329.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2011.00322

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Figures/Tables 6

References 30

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土壤质量含水量(相对含水量) W_m (W_r)	表观量子效率 AQY (μmol?mol^-1)	暗呼吸速率 R_d(μmol?m^-2?s^-1)	光补偿点 LCP (μmol?m^-2?s^-1)	光饱和点 LSP (μmol?m^-2?s^-1)	最大净光合速率 P_nmax(μmol?m^-2?s^-1)
22.3% (81.8%)	0.022 ± 0.005^bc	-1.07 ± 0.14^d	61 ± 10^b	1 023 ± 20^d	6.46 ± 0.28^d
20.5% (74.5%)	0.033 ± 0.002^b	-1.24 ± 0.26^c	46 ± 8^c	1 110 ± 23^c	8.47 ± 0.56^c
18.6% (67.6%)	0.083 ± 0.003^a	-1.64 ± 0.15^b	22 ± 4^d	1 365 ± 32^a	13.30 ± 0.45^a
16.9% (61.5%)	0.043 ± 0.005^b	-1.85 ± 0.32^a	47 ± 6^c	1 268 ± 14^b	12.66 ± 0.40^ab
14.8% (53.8%)	0.033 ± 0.012^b	-1.92 ± 0.35^a	64 ± 10^ab	1 212 ± 28^b	11.62 ± 0.21^b
12.9% (46.9%)	0.033 ± 0.008^b	-1.64 ± 0.21^b	70 ± 11^a	1 025 ± 16^d	9.70 ± 0.38^c
9.2% (33.5%)	0.033 ± 0.007^b	-1.06 ± 0.19^d	41 ± 6^c	997 ± 21^d	5.72 ± 0.15^de
6.5% (23.6%)	0.015 ± 0.006^cd	-0.67 ± 0.05^e	47 ± 5^c	983 ± 20^d	4.14 ± 0.12^e

土壤质量含水量(相对含水量) W_m (W_r)	表观量子效率 AQY (μmol?mol^-1)	暗呼吸速率 R_d(μmol?m^-2?s^-1)	光补偿点 LCP (μmol?m^-2?s^-1)	光饱和点 LSP (μmol?m^-2?s^-1)	最大净光合速率 P_nmax(μmol?m^-2?s^-1)
22.3% (81.8%)	0.022 ± 0.005^bc	-1.07 ± 0.14^d	61 ± 10^b	1 023 ± 20^d	6.46 ± 0.28^d
20.5% (74.5%)	0.033 ± 0.002^b	-1.24 ± 0.26^c	46 ± 8^c	1 110 ± 23^c	8.47 ± 0.56^c
18.6% (67.6%)	0.083 ± 0.003^a	-1.64 ± 0.15^b	22 ± 4^d	1 365 ± 32^a	13.30 ± 0.45^a
16.9% (61.5%)	0.043 ± 0.005^b	-1.85 ± 0.32^a	47 ± 6^c	1 268 ± 14^b	12.66 ± 0.40^ab
14.8% (53.8%)	0.033 ± 0.012^b	-1.92 ± 0.35^a	64 ± 10^ab	1 212 ± 28^b	11.62 ± 0.21^b
12.9% (46.9%)	0.033 ± 0.008^b	-1.64 ± 0.21^b	70 ± 11^a	1 025 ± 16^d	9.70 ± 0.38^c
9.2% (33.5%)	0.033 ± 0.007^b	-1.06 ± 0.19^d	41 ± 6^c	997 ± 21^d	5.72 ± 0.15^de
6.5% (23.6%)	0.015 ± 0.006^cd	-0.67 ± 0.05^e	47 ± 5^c	983 ± 20^d	4.14 ± 0.12^e

类群 Cluster	土壤质量含水量 Soil mass water content (W_m)	土壤水分生产力分级 Grading of soil moisture productivity	土壤质量含水量预测阈值 The W_m threshold value of predication	光合生理参数(平均值±标准误差) Photosynthetic and physiological parameters (mean ± SE)
类群 Cluster	土壤质量含水量 Soil mass water content (W_m)	土壤水分生产力分级 Grading of soil moisture productivity	土壤质量含水量预测阈值 The W_m threshold value of predication	净光合速率 P_n(μmol?m^-2?s^-1)	蒸腾速率 T_r(mmol?m^-2?s^-1)	水分利用效率 WUE (mmol?mol^-1)
A	22.3%, 9.2%, 6.5%	低产中效水 Low productivity and middle WUE	>22.3% or <9.2%	4.30 ± 0.89^c	1.29 ± 0.29^b	2.93 ± 0.34^b
B	20.5%, 12.9%	中产低效水 Middle productivity and low WUE	20.5%-22.3%	6.92 ± 0.43^b	2.48 ± 0.88^a	2.66 ± 0.95^c
B	20.5%, 12.9%	中产中效水 Middle productivity and middle WUE	9.2%-12.9%	6.92 ± 0.43^b	2.48 ± 0.88^a	2.66 ± 0.95^c
C	18.6%, 16.9%, 14.8%	高产高效水 High productivity and high WUE	12.9%-20.5%	10.09 ± 1.35^a	2.53 ± 0.28^a	3.82 ± 0.35^a

类群 Cluster	土壤质量含水量 Soil mass water content (W_m)	土壤水分生产力分级 Grading of soil moisture productivity	土壤质量含水量预测阈值 The W_m threshold value of predication	光合生理参数(平均值±标准误差) Photosynthetic and physiological parameters (mean ± SE)
类群 Cluster	土壤质量含水量 Soil mass water content (W_m)	土壤水分生产力分级 Grading of soil moisture productivity	土壤质量含水量预测阈值 The W_m threshold value of predication	净光合速率 P_n(μmol?m^-2?s^-1)	蒸腾速率 T_r(mmol?m^-2?s^-1)	水分利用效率 WUE (mmol?mol^-1)
A	22.3%, 9.2%, 6.5%	低产中效水 Low productivity and middle WUE	>22.3% or <9.2%	4.30 ± 0.89^c	1.29 ± 0.29^b	2.93 ± 0.34^b
B	20.5%, 12.9%	中产低效水 Middle productivity and low WUE	20.5%-22.3%	6.92 ± 0.43^b	2.48 ± 0.88^a	2.66 ± 0.95^c
B	20.5%, 12.9%	中产中效水 Middle productivity and middle WUE	9.2%-12.9%	6.92 ± 0.43^b	2.48 ± 0.88^a	2.66 ± 0.95^c
C	18.6%, 16.9%, 14.8%	高产高效水 High productivity and high WUE	12.9%-20.5%	10.09 ± 1.35^a	2.53 ± 0.28^a	3.82 ± 0.35^a