毛乌素沙地沙柳光系统Ⅱ光保护机制和能量分配动态及其影响因子

doi:10.11707/j.1001-7488.20201004

Abstract

Abstract:

With the technique of in situ continuous monitoring of chlorophyll fluorescence, the energy distribution of photosystem Ⅱ in Salix psammophila and its response to environmental factors were explored in the semi-arid area of Mu Us sandy land. The dynamic effects of environmental factors on energy distribution of the photosystem Ⅱ and their photosynthetic physiological adaptation strategies were revealed in the daily and seasonal scales, in order to provide theoretical guidance for vegetation restoration management and species selection in the study area.Method: Chlorophyll fluorescence was continuously measured in situ and fluorescence parameters were calculated using Kramer methods of light energy allocation. Result: At the diurnal scale, photochemical efficiency φ_PSⅡ) and regulated heat dissipation φ_NPQ) were directly related to photosynthetically active radiation (PAR), and also influenced by air temperature (T_a), relative humidity (RH) and vapor pressure deficit (VPD).The non-regulate heat dissipation φ_NO) was relatively stable. At the seasonal scale, at the early stage of the growing season (May-June), φ_PSⅡ and φ_NPQ partitioning is relatively uniform, φ_NO was higher and remained stable. Maximum quantum yield of PSⅡ photochemistry (F_v/F_m) declined. In the mid-growing season (July - September), August φ_PSⅡ significantly decreased and φ_NPQ rose. At the end of the growing season (October), φ_PSⅡ was lowest, φ_NPQ was highest, and φ_NO value was higher and more stable. F_v/F_m declined. Conclusion: On the daily scale, the energy partitioning of photosystem Ⅱ is mainly affected by PAR and T_a, while it is less regulated by RH and VPD. At the seasonal scale, energy partitioning is mainly regulated by the phenological period. F_v/F_m is significantly correlated with PAR_max (R² = 0.13, P < 0.01), T_a variation (R² = 0.16, P < 0.01) and soil moisture content (SWC) (R² = 0.19, P < 0.01), indicating that high radiation, extreme temperature and drought are the main environmental stress factors limiting the photosynthetic physiological state of Salix psammophila. Energy partitioning is likely to be caused by the difference between the short-term regulation mechanism such as photosystem Ⅱ lutein cycle and the long-term regulation mechanism such as chlorophyll. The results enrich the physiological plasticity theory of desert plants in response to environmental fluctuations and provide a scientific basis for vegetation restoration in semi-arid regions.

Key words: semi-arid, Salix psammophila, chlorophyll fluorescence, photosystem Ⅱ energy partitioning, non-photochemical quenching

CLC Number:

S718.51

Chuan Jin,Tianshan Zha,Xin Jia,Yun Tian,Wenjun Zhou,Tengzhou Wei. Light Energy Partitioning, Photoprotection and Influencing Factors of PhotosystemⅡ in an Exotic Species (Salix psammophila) in Mu Us Sandy Land[J]. Scientia Silvae Sinicae, 2020, 56(10): 34-44.

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References 0

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叶绿素荧光参数 Chlorophyll fluorescence parameters	环境因子 Environmental factors	拟合方程 Fitting equation	决定系数R² Coefficient of determination R²	显著水平P Significant level P
实际光化学效率 Photochemical efficiency	最大光合有效辐射 Maximal daily photosynthetic active radiation	y = 0.80-1.13×10^-4x	0.26	< 0.05
	相对湿度 Relative humidity	y = 0.51-1.88×10^-3x	0.14	< 0.01
	饱和水汽压差 Vapor pressure deficit	y = 0.67-5.04×10^-2x	0.11	< 0.01
非光化学淬灭 Non-photochemical quenching	土壤含水量 Soil water content	y = 2.06-1.50×10 x	0.12	< 0.01
最大光化学效率 Maximum quantum yield of PSⅡ photochemistry	最大光合有效辐射 Maximal daily photosynthetic active radiation	y = 0.85-9.49×10^-6x	0.13	< 0.01
	空气温度变化幅度 Range of air temperature	y = 0.84-6.97×10^-2x	0.16	< 0.01
	土壤含水量 Soil water content	y = 0.76-1.21×10^-1x	0.19	< 0.01

叶绿素荧光参数 Chlorophyll fluorescence parameters	环境因子 Environmental factors	拟合方程 Fitting equation	决定系数 Coefficient of determination(R²)	显著水平 Significant level(P)
实际光化学效率 Photochemical efficiency	光合有效辐射 Photosynthetic active radiation	y = 0.73-4.93×10^-4x+1.67×10^-7x²	0.98	< 0.01
	空气温度 Air temperature	y = 0.63+1.24×10^-2x-6.91×10^-4x²	0.82	< 0.01
	相对湿度 Relative humidity	y = 0.42+3.43×10^-3x	0.96	< 0.01
	饱和水汽压差 Vapor pressure deficit	y = 0.72-9.85×10^-2x	0.87	< 0.01
非光化学淬灭 Non-photochemical quenching	光合有效辐射 Photosynthetic active radiation	y = 0.52+1.11×10^-3x	0.93	< 0.01
	空气温度 Air temperature	y = 0.25+4.06×10^-3x+1.79×10^-3x²	0.71	< 0.01
	相对湿度 Relative humidity	y = 1.87-1.71×10^-2x	0.69	< 0.01
	饱和水汽压差 Vapor pressure deficit	y = 0.44+4.09×10^-1x	0.83	< 0.01

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Light Energy Partitioning, Photoprotection and Influencing Factors of PhotosystemⅡ in an Exotic Species (Salix psammophila) in Mu Us Sandy Land

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