Effects of Biological Carbon and Water Regulation on Photosynthetic Characteristics of Flue-cured Tobacco

doi:10.11923/j.issn.2095-4050.cjas2020-0122

Abstract

Abstract:

To explore the effects of different water regulation measures on photosynthetic characteristics of flue-cured tobacco after the application of biochar, field experiments were conducted to study the changes of photosynthetic characteristics of flue-cured tobacco at different growth stages and their correlation, relative chlorophyll content (SPAD) and economic traits. The results showed that after the application of biochar, different water regulation treatments increased the net photosynthetic rate (Pn) of flue-cured tobacco at different growth stages, with the strongest in the vigorous growing stage, followed by the spherical plant stage, and the mature period was relatively weak. Pn was significantly related to physiological and ecological factors. After applying biochar, the Pn of water regulation treatment was mainly affected by stomatal conductance, and the Pn of non-biochar and non-irrigated water treatment (CK) was mainly affected by transpiration. The SPAD value, yield and output value of flue-cured tobacco showed significant differences, and those of the irrigation water of 300 mL/plant every 5 days after the application of biochar were the highest and of CK were the lowest, reaching a significant difference (P<0.05). Therefore, the photosynthetic capacity of tobacco leaves could be promoted by water regulation after biochar application, and the photosynthetic capacity of tobacco leaves is the strongest under irrigation of 300 mL/plant every 5 days after biochar application.

Key words: Biochar, Water Regulation, Flue-cured Tobacco, Photosynthetic Characteristics, Path Analysis

CLC Number:

S572

Fu Changwu, Wang Zufu, Song Jiaqing, Hou Xiangwen, Qin Xiao, Dai Xi, Yuan Mouzhi, Yao Wang. Effects of Biological Carbon and Water Regulation on Photosynthetic Characteristics of Flue-cured Tobacco[J]. Journal of Agriculture, 2021, 11(10): 69-74.

Figures/Tables 7

References 29

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时期	处理	Pn/[μmol CO₂/(m²·s)]	Gs/[mol H₂O/(m²·s)]	Ci/(μmol CO₂/mol)	Tr/[mmol H₂O/(m²·s)]	VpdL/kPa	WUE	Tl/℃
团棵期	CK	14.07±0.41c	0.52±0.05c	326.58±1.45a	3.35±0.14b	0.67±0.02c	4.20±0.04c	24.30±0.05b
	T1	14.90±0.72c	0.55±0.04c	317.10±0.91b	3.45±0.15b	0.73±0.02b	4.32±0.05b	26.43±0.05a
	T2	16.59±0.17b	0.64±0.07b	321.55±1.78b	3.71±0.24a	0.77±0.07b	4.47±0.13a	27.77±0.86a
	T3	17.48±0.41a	0.73±0.00a	319.02±1.13b	3.91±0.02a	0.87±0.00a	4.47±0.12a	28.42±0.03a
旺长期	CK	15.55±0.14c	0.53±0.03b	330.09±2.31a	4.62±0.33c	0.92±0.08b	3.37±0.14a	31.76±0.20b
	T1	16.57±1.764b	0.61±0.03ab	325.98±2.20b	4.82±0.18b	0.99±0.02ab	3.34±0.37a	31.19±0.46b
	T2	17.43±0.80a	0.65±0.13a	323.33±2.16b	5.24±0.38a	1.01±0.10a	3.33±0.16a	32.15±0.21a
	T3	18.42±0.30a	0.65±0.03a	322.80±1.10b	5.32±0.08a	1.17±0.06a	3.46±0.19a	32.08±0.23a
成熟期	CK	5.79±0.34d	0.09±0.00a	272.87±9.58a	2.35±0.12a	2.42±0.02ab	2.46±0.20b	33.63±0.08b
	T1	6.17±0.20c	0.09±0.03a	241.72±7.91b	2.24±0.75a	2.37±0.11ab	2.75±0.19a	33.90±0.29ab
	T2	6.69±0.19b	0.09±0.01a	248.40±2.74b	2.13±0.23a	2.19±0.10b	3.14±0.29a	35.04±0.77a
	T3	7.11±0.28a	0.09±0.02a	224.69±7.13c	2.20±0.47a	2.60±0.10a	3.23±0.19a	36.66±0.38a

时期	处理	Pn/[μmol CO₂/(m²·s)]	Gs/[mol H₂O/(m²·s)]	Ci/(μmol CO₂/mol)	Tr/[mmol H₂O/(m²·s)]	VpdL/kPa	WUE	Tl/℃
团棵期	CK	14.07±0.41c	0.52±0.05c	326.58±1.45a	3.35±0.14b	0.67±0.02c	4.20±0.04c	24.30±0.05b
	T1	14.90±0.72c	0.55±0.04c	317.10±0.91b	3.45±0.15b	0.73±0.02b	4.32±0.05b	26.43±0.05a
	T2	16.59±0.17b	0.64±0.07b	321.55±1.78b	3.71±0.24a	0.77±0.07b	4.47±0.13a	27.77±0.86a
	T3	17.48±0.41a	0.73±0.00a	319.02±1.13b	3.91±0.02a	0.87±0.00a	4.47±0.12a	28.42±0.03a
旺长期	CK	15.55±0.14c	0.53±0.03b	330.09±2.31a	4.62±0.33c	0.92±0.08b	3.37±0.14a	31.76±0.20b
	T1	16.57±1.764b	0.61±0.03ab	325.98±2.20b	4.82±0.18b	0.99±0.02ab	3.34±0.37a	31.19±0.46b
	T2	17.43±0.80a	0.65±0.13a	323.33±2.16b	5.24±0.38a	1.01±0.10a	3.33±0.16a	32.15±0.21a
	T3	18.42±0.30a	0.65±0.03a	322.80±1.10b	5.32±0.08a	1.17±0.06a	3.46±0.19a	32.08±0.23a
成熟期	CK	5.79±0.34d	0.09±0.00a	272.87±9.58a	2.35±0.12a	2.42±0.02ab	2.46±0.20b	33.63±0.08b
	T1	6.17±0.20c	0.09±0.03a	241.72±7.91b	2.24±0.75a	2.37±0.11ab	2.75±0.19a	33.90±0.29ab
	T2	6.69±0.19b	0.09±0.01a	248.40±2.74b	2.13±0.23a	2.19±0.10b	3.14±0.29a	35.04±0.77a
	T3	7.11±0.28a	0.09±0.02a	224.69±7.13c	2.20±0.47a	2.60±0.10a	3.23±0.19a	36.66±0.38a

时期	处理	Ta/℃	Ca/(μmol CO₂/mol)	RH/%	PAR/[μmol/(m²·s)]
团棵期	CK	26.67±0.08c	376.08±0.87a	75.65±0.45b	116.95±6.60d
	T1	26.82±0.06c	372.30±0.59a	78.04±0.19a	194.56±5.46c
	T2	28.41±0.13b	377.37±0.12a	78.55±0.46a	204.55±5.01b
	T3	29.91±0.01a	379.51±0.03a	79.80±0.16a	227.60±4.55a
旺长期	CK	30.10±0.11c	367.23±1.54c	74.07±0.09b	844.46±29.72d
	T1	31.99±0.02b	370.24±2.03b	75.41±0.39ab	961.55±29.50c
	T2	33.00±0.01a	374.40±0.15b	76.34±0.34a	1025.24±36.57b
	T3	33.27±0.06a	386.26±1.39a	77.54±0.09a	1238.58±36.43a
成熟期	CK	32.33±0.07d	392.39±0.23a	56.40±0.28b	482.46±16.12d
	T1	35.42±0.18c	391.31±1.62a	58.35±0.18ab	529.73±22.15c
	T2	36.10±0.22b	392.20±1.48a	59.22±0.21a	678.28±17.15b
	T3	37.19±0.33a	391.67±0.71a	61.36±0.22a	723.11±19.98a

时期	处理	Ta/℃	Ca/(μmol CO₂/mol)	RH/%	PAR/[μmol/(m²·s)]
团棵期	CK	26.67±0.08c	376.08±0.87a	75.65±0.45b	116.95±6.60d
	T1	26.82±0.06c	372.30±0.59a	78.04±0.19a	194.56±5.46c
	T2	28.41±0.13b	377.37±0.12a	78.55±0.46a	204.55±5.01b
	T3	29.91±0.01a	379.51±0.03a	79.80±0.16a	227.60±4.55a
旺长期	CK	30.10±0.11c	367.23±1.54c	74.07±0.09b	844.46±29.72d
	T1	31.99±0.02b	370.24±2.03b	75.41±0.39ab	961.55±29.50c
	T2	33.00±0.01a	374.40±0.15b	76.34±0.34a	1025.24±36.57b
	T3	33.27±0.06a	386.26±1.39a	77.54±0.09a	1238.58±36.43a
成熟期	CK	32.33±0.07d	392.39±0.23a	56.40±0.28b	482.46±16.12d
	T1	35.42±0.18c	391.31±1.62a	58.35±0.18ab	529.73±22.15c
	T2	36.10±0.22b	392.20±1.48a	59.22±0.21a	678.28±17.15b
	T3	37.19±0.33a	391.67±0.71a	61.36±0.22a	723.11±19.98a

处理	Gs	Ci	Tr	VpdL	WUE	Tl	Ta	Ca	RH	PAR
CK	0.8960^**	0.7512^*	0.9247^**	-0.8643^**	0.7601^*	-0.5048	-0.4359	-0.9325^**	0.8478^**	0.5629
T1	0.9269^**	0.8016^**	0.8038^**	-0.8580^**	0.3065	-0.6714^*	-0.6442^*	-0.9181^**	0.8988^**	0.3072
T2	0.9367^**	0.8666^**	0.9110^**	-0.9001^**	0.0549	-0.7117^*	-0.6885^*	-0.8686^**	0.8825^**	0.7641^*
T3	0.9929^**	0.6295^*	0.8214^**	-0.9867^**	0.2610	-0.8855^**	-0.8519^**	-0.9692^**	0.9813^**	0.5659