Effects of Different Nitrogen Supply on Photosynthetic Characteristics and Growth of Calamagrostis angustifolia Under Elevated CO2 Concentration

doi:10.11924/j.issn.1000-6850.casb2021-1196

Abstract

Abstract:

In order to reveal the effects of elevated CO₂ concentration and different nitrogen supply on the photosynthetic characteristics and growth of wetland plants, the marsh predominated with Calamagrostis angustifolia in Sanjiang Plain was studied. A manipulative in situ experiment was performed. Open top chambers (OTCs) were used for the CO₂ concentration treatment in order to model the effects of elevated CO₂ concentration in the atmospheric environment. Three levels of CO₂ concentration, i.e., E₀ (380±20 μmol/mol), E₁ (550±20 μmol/mol) and E₂ (700±20 μmol/mol), and three levels of nitrogen fertilization, i.e., N₀ (0 g N/m² ), N₁ (4 g N/m² ) and N₂(8 g N/m²), were applied in the study. Under treatment N₀, after a long period of elevated CO₂ concentration treatment (72 days), the net photosynthetic rate of C. angustifolia under E₁ and E₂ was reduced by 11% and 12% (P<0.05) respectively compared with that under E₀, and the leaf soluble protein content, nitrogen content (72 days by CO₂ fumigation) and the plant height (86 days by CO₂ fumigation) were all significantly lower than those under E₀ (P<0.05). Under treatment N₁, the net photosynthetic rate of C. angustifolia under E₁and E₂ (72 days) decreased by 5% (P>0.05) and 10% (P<0.05) compared with that under E₀, respectively, and the leaf nitrogen content (P<0.05) and plant height were lower than those under E₀. Under treatment N₂, the net photosynthetic rate of C. angutifolia under E₁and E₂ (72 days) had a slight increase trend (P>0.05), the leaf soluble protein content was significantly enhanced (P<0.05), and the leaf nitrogen content and plant height had no significant change (P>0.05). The elevated CO₂ concentration significantly increased the soluble sugar content in the leaves of C. angustifolia under treatment N₀, N₁ and N₂. Our results indicate that the long-term increase of CO₂ concentration may decrease the net photosynthetic rate of C. angustifolia leaves by reducing the activity of photosynthesis enzyme, and the high-rate application of nitrogen fertilizer can alleviate the negative effects of long-term high CO₂ concentration on photosynthesis and growth of wetland plants.

Key words: Calamagrostis angustifolia, elevated CO₂ concentration, nitrogen, photosynthesis

CLC Number:

S181

WANG Jianbo, WANG Jifeng, FU Xiaoling, ZHONG Haixiu, LIU Yingnan, NI Hongwei. Effects of Different Nitrogen Supply on Photosynthetic Characteristics and Growth of Calamagrostis angustifolia Under Elevated CO₂ Concentration[J]. Chinese Agricultural Science Bulletin, 2022, 38(17): 44-50.

Figures/Tables 4

References 33

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处理		净光合速率 P_n/[µmol/(m²·s)]	气孔导度 G_s/[mol/(m²·s)]	胞间CO₂浓度 C_i/[µmol/(m²·s)]	蒸腾速率 T_r/[(mmol/(m²·s)]
E0	N0	13.91±0.57b	0.20±0.01bc	268.98±8.15a	5.08±0.51b
	N1	14.46±0.88bc	0.22±0.02c	269.98±7.42a	5.19±0.76bc
	N2	14.67±0.71c	0.23±0.01c	273.65±9.29b	5.27±0.35c
E1	N0	12.44±0.21a	0.17±0.01a	270.27±10.93a	4.76±0.25a
	N1	13.72±0.52ab	0.18±0.02a	272.53±11.95ab	4.91±0.34ab
	N2	14.79±0.24c	0.22±0.01c	288.20±7.71c	5.21±0.89bc
E2	N0	12.27±0.61a	0.17±0.01a	279.98±6.05b	4.42±0.97a
	N1	13.03±0.16a	0.19±0.02ab	288.08±6.48c	4.53±0.76a
	N2	14.87±0.67c	0.21±0.02bc	286.38±11.19c	5.25±0.52c

处理		净光合速率 P_n/[µmol/(m²·s)]	气孔导度 G_s/[mol/(m²·s)]	胞间CO₂浓度 C_i/[µmol/(m²·s)]	蒸腾速率 T_r/[(mmol/(m²·s)]
E0	N0	13.91±0.57b	0.20±0.01bc	268.98±8.15a	5.08±0.51b
	N1	14.46±0.88bc	0.22±0.02c	269.98±7.42a	5.19±0.76bc
	N2	14.67±0.71c	0.23±0.01c	273.65±9.29b	5.27±0.35c
E1	N0	12.44±0.21a	0.17±0.01a	270.27±10.93a	4.76±0.25a
	N1	13.72±0.52ab	0.18±0.02a	272.53±11.95ab	4.91±0.34ab
	N2	14.79±0.24c	0.22±0.01c	288.20±7.71c	5.21±0.89bc
E2	N0	12.27±0.61a	0.17±0.01a	279.98±6.05b	4.42±0.97a
	N1	13.03±0.16a	0.19±0.02ab	288.08±6.48c	4.53±0.76a
	N2	14.87±0.67c	0.21±0.02bc	286.38±11.19c	5.25±0.52c

Effects of Different Nitrogen Supply on Photosynthetic Characteristics and Growth of Calamagrostis angustifolia Under Elevated CO₂ Concentration

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