Seasonal changes of photosynthetic characteristics of Alpinia oxyphylla growing under Hevea brasiliensis

doi:10.17521/cjpe.2018.0016

Abstract

Abstract:

Aims The development of ecological agriculture by agroforestry models could improve resource utilization. The Hevea brasiliensis-Alpinia oxyphylla agroforestry system is among the largest agroforestry models in rubber plantation. In this study, we aimed to investigate the physiological strategies that allow Alpinia oxyphylla, a perennial herb widespread under-growing the Hevea brasiliensis, to cope successfully with the environmental factors with the seasonal changes of the tropical monsoon climate.

Methods Gas exchange and light response curve measurements as well as pigment content determinations were performed periodically throughout different seasons on A. oxyphylla growing in the rubber plantation by a portable leaf gas exchange system (LI-6400).

Important findings (1) The diurnal change of the net photosynthetic rate had a V-shaped pattern in March, which decreased to be the lowest at 14:00. The diurnal changes of the P_n in June, September, and December increased to the peak at 10:00 and then began to decline slowly. The daily average and maximum of the net photosynthetic rate during the monsoon season (June and September) were much higher than those in the dry season (March and December), which suggested that A. oxyphylla had the physiological strategy to environmental changes in different seasons. The severe soil moisture deficit inhibits photosynthetic CO₂ assimilation due to the decline of stomatal conductance in March. (2) The light compensation point and dark respiration rate of March generally were higher than those of other seasons (June, September and December), but the maximum net photosynthetic rate and light saturation point were on the contrary. The discrepancies that may be related to the photosynthetic enzymatic activity were restrained by the dry conditions, which caused the occurrence of photoinhibition, the increased respiration, and decreased photosynthetic capacity. (3) The net photosynthetic rate in March was negatively correlated with air temperature, but positively correlated with air humidity. Air temperature and air humidity in combination inhibited photosynthesis of A. oxyphylla in March. However, photosynthetic active radiation was a pivotal factor to photosynthesis of A. oxyphylla in September and December.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201805007

Key words: photosynthetic characteristics, environmental factor, Alpinia oxyphylla, seasonal change, diurnal change of photosynthesis

CHENG Han-Ting, LI Qin-Fen, LIU Jing-Kun, YAN Ting-Liang, ZHANG Qiao-Yan, WANG Jin-Chuang. Seasonal changes of photosynthetic characteristics of Alpinia oxyphylla growing under Hevea brasiliensis[J]. Chin J Plant Ecol, 2018, 42(5): 585-594.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2018.0016

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Figures/Tables 7

References 34

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	叶绿素a Chl a (mg·cm^-2)	叶绿素b Chl b (mg·cm^-2)	类胡萝卜素 Car (mg·cm^-2)	总叶绿素 Chl (mg·cm^-2)	叶绿素a/b Chl a/b	比叶质量 LMA (g·m^-2)	叶片含水量 Leaf water content (%)
3月 Mar.	2.60^a	1.64^a	3.15^a	7.39^a	1.59^a	51.26^a	65.17^c
6月 June	2.60^a	1.28^b	2.67^c	6.55^b	2.02^b	43.06^c	74.31^a
9月 Sept.	2.62^a	1.33^b	2.60^c	6.55^b	1.97^b	48.82^ab	75.95^a
12月 Dec.	2.52^a	1.31^b	2.76^b	6.48^b	1.93^b	45.25^bc	68.64^b

	叶绿素a Chl a (mg·cm^-2)	叶绿素b Chl b (mg·cm^-2)	类胡萝卜素 Car (mg·cm^-2)	总叶绿素 Chl (mg·cm^-2)	叶绿素a/b Chl a/b	比叶质量 LMA (g·m^-2)	叶片含水量 Leaf water content (%)
3月 Mar.	2.60^a	1.64^a	3.15^a	7.39^a	1.59^a	51.26^a	65.17^c
6月 June	2.60^a	1.28^b	2.67^c	6.55^b	2.02^b	43.06^c	74.31^a
9月 Sept.	2.62^a	1.33^b	2.60^c	6.55^b	1.97^b	48.82^ab	75.95^a
12月 Dec.	2.52^a	1.31^b	2.76^b	6.48^b	1.93^b	45.25^bc	68.64^b

月份 Month	表观量子效率 AQE	光补偿点 I_c(μmol·m^-2·s^-1)	暗呼吸速率 R_d(μmol·mol^-1)	最大净光合速率 P_nmax(μmol·m^-2·s^-1)	光饱和点 I_s(μmol·m^-2·s^-1)
3月 Mar.	0.068^c	16.144^a	0.865^a	3.213^d	522.968^b
6月 June	0.100^a	5.813^b	0.550^b	8.006^c	1010.264^a
9月 Sept.	0.095^a	3.514^c	0.324^c	10.648^a	1021.726^a
12月 Dec.	0.086^b	3.906^c	0.326^c	8.783^b	964.900^a

月份 Month	表观量子效率 AQE	光补偿点 I_c(μmol·m^-2·s^-1)	暗呼吸速率 R_d(μmol·mol^-1)	最大净光合速率 P_nmax(μmol·m^-2·s^-1)	光饱和点 I_s(μmol·m^-2·s^-1)
3月 Mar.	0.068^c	16.144^a	0.865^a	3.213^d	522.968^b
6月 June	0.100^a	5.813^b	0.550^b	8.006^c	1010.264^a
9月 Sept.	0.095^a	3.514^c	0.324^c	10.648^a	1021.726^a
12月 Dec.	0.086^b	3.906^c	0.326^c	8.783^b	964.900^a

月份 Month	生理生态因子 Physio-ecological factors	P_n	C_a	PAR	T_a	RH	G_s	C_i
3月 Mar.	P_n	1.000
	C_a	0.883^*	1.000
	PAR	-0.678	-0.664	1.000
	T_a	-0.947^**	-0.889^*	0.735	1.000
	RH	0.985^**	0.847^*	-0.669	-0.902^*	1.000
	G_s	0.891^*	0.946^**	-0.539	-0.852^*	0.898^*	1.000
	C_i	-0.464	-0.234	0.554	0.488	-0.372	-0.044	1.000
6月 June	P_n	1.000
	C_a	0.692	1.000
	PAR	-0.349	-0.868^*	1.000
	T_a	-0.265	-0.793	0.937^**	1.000
	RH	0.449	0.909^*	-0.904^*	-0.950^**	1.000
	G_s	0.921^**	0.507	-0.108	-0.099	0.279	1.000
	C_i	0.283	0.576	-0.494	-0.702	0.729	0.403	1.000
9月 Sept.	P_n	1.000
	C_a	-0.416	1.000
	PAR	0.908^*	-0.472	1.000
	T_a	0.821^*	-0.665	0.733	1.000
	RH	-0.716	0.837^*	-0.678	-0.960^**	1.000
	G_s	0.940^**	-0.310	0.941^**	0.665	-0.549	1.000
	C_i	-0.009	-0.037	-0.055	-0.067	0.112	0.174	1.000
12月 Dec.	P_n	1.000
	C_a	-0.536	1.000
	PAR	0.969^**	-0.470	1.000
	T_a	0.579	-0.878^*	0.507	1.000
	RH	-0.561	0.928^**	-0.483	-0.989^**	1.000
	G_s	0.908^*	-0.737	0.902^*	0.706	-0.693	1.000
	C_i	-0.232	0.350	-0.133	-0.389	0.459	-0.022	1.000