干旱区生态环境知识资源中心(Arid): 毛乌素沙地油蒿光系统II多时间尺度的环境响应特征

Arid

	毛乌素沙地油蒿光系统II多时间尺度的环境响应特征
其他题名	Multi-time scale property of environmental responses to photosystem II of Artemisia ordosica in Mu Us desert
	靳川; 蒋燕; 李鑫豪; 徐铭泽; 高圣杰; 魏宁宁; 贾昕; 田赟; 查天山
来源期刊	农业工程学报
ISSN	1002-6819
出版年	2021
卷号	37 期号:2 页码:152-160
中文摘要	中国西北荒漠地区极端天气事件频发,探究荒漠植物适应环境波动的调节过程和机制,可帮助预测未来气候变化背景下荒漠生态系统群落的演替和发展。该研究选取宁夏盐池毛乌素沙地优势物种油蒿(Artemisia ordosica)为研究对象,进行叶绿素荧光的长期原位连续观测。运用小波分析方法探究油蒿光系统II(Photosystem II,PSII)能量分配参数与光合有效辐射(Photosynthetically Active Radiation,PAR)、空气温度、饱和水汽压差(Vapor Pressure Difference,VPD)和土壤含水率(Soil Water Content,SWC)在多时间尺度上的动态格局。结果表明:日尺度下,PSII能量分配参数滞后PAR 43 min,分别滞后空气温度、VPD和SWC 3.3、4.6和10.72 h(P<0.05),油蒿可能通过叶黄素循环等热耗散机制和改变气孔导度等途径调节PSII能量分配。在季节尺度下,PSII能量分配参数分别滞后于空气温度、VPD和PAR 7.2、 8.8和14.7 d,滞后于SWC长达21.6 d(P<0.05),油蒿可能通过提高PSII修复能力、增加特定蛋白数量和叶绿素浓度等方式调节PSII能量分配。油蒿PSII能量分配参数和最大光化学效率的波动符合其物候期规律,最大光化学效率和实际光化学效率在7和8月降低,调节性热耗散和非调节性热耗散增高。5和9月,非调节性热耗散增高且伴随最大光化学效率低值出现。研究认为,不同时间尺度PSII能量分配调控机制存在差异,油蒿通过修复损伤最大光化学效率维持在0.78附近使PSII生理状态恢复正常生理水平,对水分亏缺、极端温度和高辐射有一定适应能力。该研究可为农作物生长实时监测与保护农业生态平衡提供科学参考。
英文摘要	Extreme weather events occur frequently in the desert region of northwest China,such as drought,high temperature,and strong radiation.Desert vegetation is often exposed to multiple environmental stresses.Plants in deserts are at risk of rapid degradation,particularly that those are sensitive to climate change.Therefore,it is necessary to explore the response of vegetation to environmental fluctuations in this region,aiming to clarify the regulatory mechanisms of desert plants to the environments,and thereby predict the succession and development of desert ecosystem communities under future climate change.Chlorophyll fluorescence technology can rapidly collect detailed information of photosystem II(PSII)energy distribution without damage,which is widely used for in situ monitoring environmental stress in plants.However,there are some lags of covariance between chlorophyll fluorescence parameters and related environmental factors by just visually examining their time series,particularly on timescales.Wavelet analysis can be selected to analyze transient dynamics between two-time series,providing valuable insights into the temporal dynamics of ecological time series and their environmental controls.Unfortunately,few studies were applied wavelet techniques to chlorophyll fluorescence measurements in desert ecosystems.In this study,an in-situ field measurement of chlorophyll fluorescence was conducted for Artemisia ordosica in the Mu Us desert,and then the Continuous Wavelet Transform(CWT)and Wavelet Coherence(WTC)analysis were selected to investigate how the Photosynthetically Active Radiation(PAR),air temperature,Vapor Pressure difference(VPD),and Soil Water Content(SWC)modulated the variability of PSII energy partitioning in the time-frequency domain.The results showed that:The CWT revealed that there were clear daily periodicities on the PSII energy partitioning parameters,such as the photochemical efficiency,regulated heat dissipation,and non-regulated heat dissipation,indicating a strong oscillation at intermediate scales(days to weeks).On the diurnal scale,the continuous areas of significant WTC were observed between PSII energy partitioning parameters and environmental factors during growing seasons,43 min,3.3,4.6 and 10.72 h lagged behind PAR,air temperature,VPD and SWC,respectively(P<0.05).This can imply that the heat dissipation in the lutein cycle and the change of stomatal conductance can be the underlying mechanisms regulating the energy partitioning of PSII on a short timescale.On the seasonal scale,non-continuous areas of significant WTC were observed between PSII energy partitioning parameters and environmental factors,7.2,8.8,14.7,and 21.6 days lagged behind air temperature,VPD,PAR,and SWC,respectively(P<0.05).It infers that the repairing capacity of PSII,the amount of specific protein,and chlorophyll concentration can be the underlying mechanisms regulating the energy partitioning of PSII on a long timescale.The fluctuations of the maximal quantum yield of PSII photochemistry and PSII energy partitioning parameters of Artemisia ordosica were basically consistent with the vegetation phenological period.In July and August,maximal quantum yield of PSII photochemistry and PhiPSII decreased,whereas,regulated heat dissipation and non-regulated heat dissipation increased.In May and September,non-regulated heat dissipation increased,while maximal quantum yield of PSII photochemistry decreased.
中文关键词	干旱区 ; 小波分析 ; 荧光监测 ; 季节变化
英文关键词	arid regions wavelet analysis fluorescence monitoring seasonal fluctuations
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Plant Sciences
CSCD记录号	CSCD:6934815
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/354365
作者单位	靳川, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 蒋燕, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 李鑫豪, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 徐铭泽, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 高圣杰, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 魏宁宁, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 贾昕, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 田赟, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国. 查天山, 北京林业大学水土保持学院;;北京林业大学, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, ;;, 北京;;北京 100083;;100083, 中国.
推荐引用方式 GB/T 7714	靳川,蒋燕,李鑫豪,等. 毛乌素沙地油蒿光系统II多时间尺度的环境响应特征[J]. 北京林业大学,2021,37(2):152-160.
APA	靳川.,蒋燕.,李鑫豪.,徐铭泽.,高圣杰.,...&查天山.(2021).毛乌素沙地油蒿光系统II多时间尺度的环境响应特征.农业工程学报,37(2),152-160.
MLA	靳川,et al."毛乌素沙地油蒿光系统II多时间尺度的环境响应特征".农业工程学报 37.2(2021):152-160.