Photosynthesis and fluorescence characteristics of mangrove Kandelia candel leaves in southern Zhejiang Province

doi:10.3969/j.issn.1000-5641.2022.03.010

Abstract

Abstract:

In this paper, we explore the dynamic changes in photosynthesis and chlorophyll fluorescence in Kandelia candel leaves from restored mangroves in southern Zhejiang Province to provide a scientific basis for the ecological restoration and northward migration of Kandelia candel. Using a LI-6800F portable, automatic photosynthesis-fluorescence measurement system, the diurnal variation of photosynthesis and chlorophyll fluorescence of Kandelia candel were measured for one day each month in 2019; the data was then used to analyze the relationship between the two parameters. The results showed that, except for water use efficiency (W_UE) and non-photochemical quenching (N_PQ), the diurnal variation curves of the parameters were generally u-shaped or inverted u-shaped; examples of these parameters included transpiration rate (E), stomatal conductance (G_sw), electron transfer rate (E_TR), and maximum photochemical reaction quantum efficiency ( $F_{\rm {v}}' $ / $F_{\rm {m}}'$ ). Some parameters, such as net photosynthetic rate (A), E, G_sw, and E_TR, were found to be significantly higher in July and August than in November and December. In addition, except for W_UE, the correlation between photosynthetic factors and fluorescence factors was significant on a daily basis, and the correlation between A, E, G_sw, W_UE, and E_TR was significant on a monthly basis. The results also demonstrated that the photosynthetic capacity of Kandelia candel leaves was the strongest around noon on any given day; at the monthly level, the strongest capacity was observed in the summer, followed by spring and autumn, and lastly winter. The correlation between photosynthesis and chlorophyll fluorescence of Kandelia candel leaves on individual days was higher than that at the monthly level.

Key words: mangrove Kandelia candel, dynamic variation, photosynthesis, chlorophyll fluorescence, correlation

CLC Number:

Cheng ZHOU, Ying HUANG, Hualei YANG, Minghui DU, Ying ZHANG, Jianwu TANG. Photosynthesis and fluorescence characteristics of mangrove Kandelia candel leaves in southern Zhejiang Province[J]. Journal of East China Normal University(Natural Science), 2022, 2022(3): 90-100.

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因子	净光合速率	蒸腾速率	气孔导度	胞间CO₂ 浓度	水利用效率	实际光化学量子效率	电子传递速率	光适应下最大光化学量子效率	非光化学淬灭系数	光化学淬灭系数
净光合速率	1	0.956^**	0.985^**	–0.962^**	0.759^*	–0.979^**	0.985^**	–0.989^**	0.881^**	–0.980^**
蒸腾速率		1	0.989^**	–0.915^**	0.572	–0.966^**	0.950^**	–0.966^**	0.864^**	–0.978^**
气孔导度			1	–0.929^**	0.657	–0.973^**	0.971^**	–0.979^**	0.858^**	–0.982^**
胞间CO₂浓度				1	–0.779^*	0.978^**	–0.963^**	0.982^**	–0.949^**	0.968^**
水利用效率					1	–0.687	0.774^*	–0.717^*	0.619	–0.669
实际光化学量子效率						1	–0.960^**	0.996^**	–0.944^**	0.998^**
电子传递速率							1	–0.977^**	0.863^*	–0.961^**
光适应下最大光化学量子效率								1	–0.936^**	0.994^**
非光化学淬灭系数									1	–0.925^**
光化学淬灭系数										1

因子	净光合速率	蒸腾速率	气孔导度	胞间CO₂ 浓度	水利用效率	实际光化学量子效率	电子传递速率	光适应下最大光化学量子效率	非光化学淬灭系数	光化学淬灭系数
净光合速率	1	0.981^**	0.932^**	0.033	–0.894^**	0.538	0.950^**	0.177	–0.058	0.128
蒸腾速率		1	0.957^**	0.117	–0.901^**	0.583	0.951^**	0.140	–0.067	0.238
气孔导度			1	0.224	–0.776^*	0.574	0.834^*	0.300	–0.061	0.081
胞间CO₂浓度				1	0.136	0.330	–0.065	0.507	–0.684	–0.211
水利用效率					1	–0.277	–0.941^**	0.266	–0.154	–0.305
实际光化学量子效率						1	0.566	0.618	–0.363	0.470
电子传递速率							1	0.003	0.042	0.389
光适应下最大光化学量子效率								1	–0.465	–0.328
非光化学淬灭系数									1	0.176
光化学淬灭系数										1

因子	净光合速率	蒸腾速率	气孔导度	胞间CO₂浓度	水利用效率
光照	0.958^**	0.952^**	0.866^**	–0.115	–0.939^**
气温	0.963^**	0.977^**	0.917^**	0.068	–0.926^**
空气湿度	–0.563	–0.530	–0.386	0.081	0.677

地区	树龄/a	类型	净光合速率/ (μmol·m^–2·s^–1)	气孔导度/ ( mol·m^–2·s^–1)	蒸腾速率/ (mmol·m^–2·s^–1)	水利用效率/ (μmol·mmol^–1)	最大净光合速率/ (μmol·m^–2·s^–1)	光饱和点/ (μmol·m^–2·s^–1)	参考文献
浙江鳌江口	4	人工	10.5	0.147	2.06	6.39	13.2	1514	本文
福建漳江口	30	天然	8.5	0.098	2.70	3.65	9.6	1520	文献[11]
福建漳江口	50	天然	9.3	0.164	5.39	1.74			文献[25]
福建泉州湾河口		人工	8.0	0.178	6.62	1.24	9.8	930	文献[24]
福建九龙江口		温室	19.1	0.359	5.40	3.58			文献[23]

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