干旱区生态环境知识资源中心(Arid): 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

Arid

	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
其他题名	Light Energy Partitioning,Photoprotection and Influencing Factors of PhotosystemⅡ in an Exotic Species (Salix psammophila) in Mu Us Sandy Land
	靳川; 查天山; 贾昕; 田赟; 周文君; 卫腾宙
来源期刊	林业科学
ISSN	1001-7488
出版年	2020
卷号	56 期号:10 页码:34-44
中文摘要	【目的】通过叶绿素荧光原位连续监测技术,探究毛乌素沙地半干旱区典型固沙造林物种沙柳光系统 Ⅱ能量分配及其对环境因子的响应,在日和季节尺度下揭示环境因子对沙柳光系统Ⅱ能量分配的动态影响及其光合生理适应策略特征,以期为研究地区的植被恢复管理和物种选择提供理论指导。【方法】在宁夏盐池毛乌素沙地,对固沙物种沙柳进行整个生长季(510月)的叶绿素荧光原位连续监测。采用Kramer光能分配方法计算相关荧光参数,采用分段平均方法对数据进行分组平均,利用线性回归在日和季节尺度分析荧光参数与环境因子关系。【结果】在日尺度,实际光化学效率(Phi_(PSⅡ))和调节性热耗散(Phi_(NPQ))与光合有效辐射(PAR)直接相关,受空气温度(Ta) 、相对湿度(RH)和饱和水汽压差(VPD)的影响,非调节性热耗散(Phi_(NO))相对稳定。在季节尺度,生长季前期(56月) Phi_(PSⅡ)和Phi_(NPQ)分配相对均匀,Phi_(NO)较高且在1天内稳定,最大光化学效率(F_v/F_m)有低值出现。在生长季中期 (79月),8月Phi_(PSⅡ)降低且伴随Phi_(NPQ)升高,89月Phi_(NO)在1天内波动较大。在生长季末期(10月),Phi_(P SⅡ)最低且Phi_(NPQ)达到最高,Phi_(NO)较高且在1天内稳定,F_v/F_m持续降低。【结论】在日尺度,沙柳光系统Ⅱ能量分配主要由 PAR和Ta决定,同时受RH和VPD调控。在季节尺度,沙柳光系统Ⅱ能量分配随物候期而变。沙柳F_v/F_m与日最大光合有效辐射(PAR_(max ))(R~2 = 0.13,P < 0.01) 、Ta变化幅度(R~2 = 0.16,P < 0.01)和土壤含水量(SWC)显著相关(R~2 = 0.19,P < 0.01),说明高辐射、极端气温和干旱是限制沙柳光系统Ⅱ光合生理状态的主要环境胁迫因子。沙柳光系统Ⅱ能量分配在日与季节尺度的差异,很可能是由于光系统Ⅱ叶黄素循环等短期光保护机制与叶绿素浓度、比值分配等长期调控机制的差异造成。
英文摘要	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 Phi_(PSⅡ)) and regulated heat dissipation Phi_(NPQ)) were directly related to photosynthetically active radiation (PAR),and also influenced by air temperature (Ta),relative humidity (RH) and vapor pressure deficit (VPD).The non-regulate heat dissipation Phi_(NO)) was relatively stable. At the seasonal scale,at the early stage of the growing season (May-June),Phi_(PSⅡ) and Phi_(NPQ) partitioning is relatively uniform, Phi_(NO) was higher and remained stable. Maximum quantum yield of PSⅡ photochemistry (F_v/F_m) declined. In the midgrowing season (July - September),August Phi_(PSⅡ) significantly decreased and Phi_(NPQ) rose. At the end of the growing season (October),Phi_(PSⅡ) was lowest,Phi_(NPQ) was highest,and Phi_(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 Ta,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) (R~2 = 0.13,P < 0.01),Ta variation (R~2 = 0.16,P < 0.01) and soil moisture content (SWC) (R~2 = 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.
中文关键词	半干旱区 ; 沙柳 ; 叶绿素荧光 ; 光系统Ⅱ能量分配 ; 非光化学淬灭
英文关键词	semi-arid Salix psammophila chlorophyll fluorescence photosystem Ⅱ energy partitioning nonphotochemical quenching
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Forestry
CSCD记录号	CSCD:6869016
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353651
作者单位	靳川, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, 北京 100083, 中国. 查天山, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, 北京 100083, 中国. 贾昕, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, 北京 100083, 中国. 田赟, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, 北京 100083, 中国. 周文君, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, 北京 100083, 中国. 卫腾宙, 北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业和草原局重点实验室, 北京 100083, 中国.
推荐引用方式 GB/T 7714	靳川,查天山,贾昕,等. 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[J],2020,56(10):34-44.
APA	靳川,查天山,贾昕,田赟,周文君,&卫腾宙.(2020).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.林业科学,56(10),34-44.
MLA	靳川,et al."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".林业科学 56.10(2020):34-44.