Effects of different CO2 concentration and nitrogen rates on photosynthesis and growth of winter wheat

doi:10.3969/j.issn.1004-1524.2022.12.02

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (12): 2594-2602.DOI: 10.3969/j.issn.1004-1524.2022.12.02

• Crop Science • Previous Articles Next Articles

Effects of different CO₂ concentration and nitrogen rates on photosynthesis and growth of winter wheat

WU Hao(), ZHANG Xuesong(), WANG Dan

School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210000, China

Received:2021-09-26 Online:2022-12-25 Published:2022-12-26
Contact: ZHANG Xuesong

Abstract

Abstract:

In order to elucidate the interactive effects of different nitrogen rates on photosynthesis, biomass accumulation and yield of winter wheat under the elevated CO₂ concentration, the winter wheat variety Ningmai 13 was selected as the test material, and an experiment with different CO₂ concentrations (C, ambient CO₂ concentration; T, higher CO₂ concentration, ambient CO₂ concentration+200 μmol·mol^-1) and different N levels (LN, low nitrogen, 90 kg·hm^-2; HN, high nitrogen, 240 kg·hm^-2) was conducted, and the photosynthetic characteristics, carbon and nitrogen content in leaves, biomass and yield of winter wheat at different growth stages under different treatments were measured. It was shown that the higher CO₂ concentration increased the net photosynthetic rate of winter wheat by 78.4% under the low nitrogen level and 77.2% under the high nitrogen level. At the flowering stage and the filling stage, high nitrogen level increased the above-ground biomass accumulation of winter wheat. Among all the treatments, the yield of C-LN was the smallest, yet the yield of T-HN was the highest, and the difference between them was significant (P<0.05). Therefore, it was inferred that under the elevated CO₂ concentration in the future, the biomass accumulation and yield of winter wheat could be increased by increasing the application rate of nitrogen fertilizer.

Key words: winter wheat, high CO₂ concentration, nitrogen application level, photosynthetic physiology, biomass, yield

CLC Number:

S512.1

WU Hao, ZHANG Xuesong, WANG Dan. Effects of different CO₂ concentration and nitrogen rates on photosynthesis and growth of winter wheat[J]. Acta Agriculturae Zhejiangensis, 2022, 34(12): 2594-2602.

Figures/Tables 5

References 28

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盆型 Pot type	氮水平 N level	不同时期的施用量 Application rate at different growth stages
盆型 Pot type	氮水平 N level	播种期 Sowing stage	返青期 Regreening stage	拔节期 Jointing stage
小号盆栽	LN	0.393	0.112	0.056
Small pot	HN	1.050	0.300	0.150
中号盆栽	LN	0.890	0.254	0.127
Medium pot	HN	2.360	0.674	0.337
大号盆栽	LN	1.280	0.366	0.183
Large pot	HN	3.210	0.917	0.450

盆型 Pot type	氮水平 N level	不同时期的施用量 Application rate at different growth stages
盆型 Pot type	氮水平 N level	播种期 Sowing stage	返青期 Regreening stage	拔节期 Jointing stage
小号盆栽	LN	0.393	0.112	0.056
Small pot	HN	1.050	0.300	0.150
中号盆栽	LN	0.890	0.254	0.127
Medium pot	HN	2.360	0.674	0.337
大号盆栽	LN	1.280	0.366	0.183
Large pot	HN	3.210	0.917	0.450

年份 Year	生育期 Growth stage	处理 Treatment	碳含量 Carbon content/(mg·g^-1)	氮含量 Nitrogen content/(mg·g^-1)	C/N
2019	拔节期Jointing stage	C-LN	37.81±0.32 a	5.00±0.19 b	7.61±0.35 a
		C-HN	36.75±0.19 a	5.57±0.01 a	6.60±0.04 b
		T-LN	37.11±0.28 a	5.17±0.20 ab	7.21±0.27 ab
		T-HN	36.85±0.56 a	4.99±0.10 b	7.40±0.24 a
	孕穗—抽穗期	C-LN	37.58±0.45 b	4.76±0.19 ab	7.93±0.24 a
	Booting-heading stage	C-HN	37.40±0.17 b	4.61±0.19 ab	8.16±0.38 a
		T-LN	39.36±0.29 a	5.10±0.18 a	7.75±0.34 a
		T-HN	36.58±0.57 b	4.17±0.21 b	8.86±0.52 a
	开花期Flowering stage	C-LN	39.06±0.07 b	3.97±0.10 a	9.87±0.25 a
		C-HN	39.17±0.26 b	4.03±0.29 a	9.88±0.76 a
		T-LN	41.29±0.41 a	3.91±0.27 a	9.76±0.58 a
		T-HN	40.3±0.81 ab	4.10±0.07 a	9.84±0.22 a
	灌浆期Filling stage	C-LN	38.69±0.44 a	1.20±0.10 a	29.80±0.49 a
		C-HN	36.40±0.49 b	1.42±0.06 a	24.88±0.25 b
		T-LN	39.31±0.07 a	1.22±0.04 a	31.61±1.14 a
		T-HN	38.09±0.67 a	1.43±0.19 a	24.07±0.74 b
2020	开花期Flowering stage	C-LN	41.75±0.56 a	2.75±0.17 c	15.44±0.78 a
		C-HN	42.35±0.21 a	4.39±0.07 a	10.64±0.55 b
		T-LN	41.92±0.07 a	3.48±0.23 b	12.34±0.82 b
		T-HN	42.35±0.34 a	3.62±0.18 b	11.84±0.50 b
	灌浆期Filling stage	C-LN	38.73±0.33 c	1.67±0.01 b	23.27±0.40 a
		C-HN	40.90±0.14 a	2.92±0.12 a	14.11±0.51 b
		T-LN	39.88±0.09 b	1.68±0.14 b	24.76±2.12 a
		T-HN	40.33±0.004 ab	2.84±0.23 a	14.77±1.24 b

年份 Year	生育期 Growth stage	处理 Treatment	碳含量 Carbon content/(mg·g^-1)	氮含量 Nitrogen content/(mg·g^-1)	C/N
2019	拔节期Jointing stage	C-LN	37.81±0.32 a	5.00±0.19 b	7.61±0.35 a
		C-HN	36.75±0.19 a	5.57±0.01 a	6.60±0.04 b
		T-LN	37.11±0.28 a	5.17±0.20 ab	7.21±0.27 ab
		T-HN	36.85±0.56 a	4.99±0.10 b	7.40±0.24 a
	孕穗—抽穗期	C-LN	37.58±0.45 b	4.76±0.19 ab	7.93±0.24 a
	Booting-heading stage	C-HN	37.40±0.17 b	4.61±0.19 ab	8.16±0.38 a
		T-LN	39.36±0.29 a	5.10±0.18 a	7.75±0.34 a
		T-HN	36.58±0.57 b	4.17±0.21 b	8.86±0.52 a
	开花期Flowering stage	C-LN	39.06±0.07 b	3.97±0.10 a	9.87±0.25 a
		C-HN	39.17±0.26 b	4.03±0.29 a	9.88±0.76 a
		T-LN	41.29±0.41 a	3.91±0.27 a	9.76±0.58 a
		T-HN	40.3±0.81 ab	4.10±0.07 a	9.84±0.22 a
	灌浆期Filling stage	C-LN	38.69±0.44 a	1.20±0.10 a	29.80±0.49 a
		C-HN	36.40±0.49 b	1.42±0.06 a	24.88±0.25 b
		T-LN	39.31±0.07 a	1.22±0.04 a	31.61±1.14 a
		T-HN	38.09±0.67 a	1.43±0.19 a	24.07±0.74 b
2020	开花期Flowering stage	C-LN	41.75±0.56 a	2.75±0.17 c	15.44±0.78 a
		C-HN	42.35±0.21 a	4.39±0.07 a	10.64±0.55 b
		T-LN	41.92±0.07 a	3.48±0.23 b	12.34±0.82 b
		T-HN	42.35±0.34 a	3.62±0.18 b	11.84±0.50 b
	灌浆期Filling stage	C-LN	38.73±0.33 c	1.67±0.01 b	23.27±0.40 a
		C-HN	40.90±0.14 a	2.92±0.12 a	14.11±0.51 b
		T-LN	39.88±0.09 b	1.68±0.14 b	24.76±2.12 a
		T-HN	40.33±0.004 ab	2.84±0.23 a	14.77±1.24 b

年份 Year	处理 Treatment	分蘖数 Tiller number/m^-2	籽粒数 Grain number/m^-2	产量 Yield/(g·m^-2)
2019	C-LN	280.50±17.82 a	7 750±732 a	199.38±16.79 b
	C-HN	305.25±8.25 a	7 308±251 a	221.39±17.11 ab
	T-LN	305.25±49.27 a	7 600±754 a	220.58±15.93 ab
	T-HN	330.00±43.13 a	8 229±638 a	248.67±11.15 a
2020	C-LN	243.38±27.26 a	2 597±530 b	38.81±8.47 c
	C-HN	251.63±52.77 a	4 277±605 b	97.92±11.51 b
	T-LN	247.50±26.09 a	3 741±395 b	69.18±3.74 bc
	T-HN	341.00±34.38 a	6 375±1 102 a	139.63±25.33 a

Effects of different CO₂ concentration and nitrogen rates on photosynthesis and growth of winter wheat

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