Recovery of chlorophyll fluorescence and CO2 exchange in lichen soil crusts after rehydration

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	Recovery of chlorophyll fluorescence and CO2 exchange in lichen soil crusts after rehydration
	Wu, Li 1; Lan, Shubin 1; Zhang, Delu 2; Hu, Chunxiang 1
刊名	EUROPEAN JOURNAL OF SOIL BIOLOGY
	2013-03-01
卷号	55 页码:77-82
关键词	Lichen soil crusts Chlorophyll fluorescence Photosynthetic activity CO2 exchange rate
ISSN号	1164-5563
通讯作者	Hu, CX (reprint author), Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China.
中文摘要	Lichen soil crusts (LSCs) are an important stage during the development of biological soil crusts (BSCs). The photosynthetic characteristics of this stage are determined by both of the symbiotic and free-living cyanobacteria and algae in the crusts. In this study, the recovery rate, extent, pattern of chlorophyll fluorescence and CO2 exchange in LSCs were detected after rehydration under different water contents (5%, 20% and 40%). The results showed that original fluorescence (Fo) of each group increased dramatically after rehydration and then reached a plateau to steady state; however both maximum quantum efficiency of PS II photochemistry (Fv/Fm) and the ratio of variable fluorescence at different recovery time to the maximal value during the recovery period (Fv/Fv(max)) showed a similar and corresponding "three steps" recovery pattern. At the end of experiment, Fv/Fm of 20% water content group recovered to the highest level (0.45), although no obvious difference in the Fv/Fm was found among the three water content groups within the first 4 h. Additionally, after the rehydration CO2 release from LSCs (under the light) gradually decreased, and the organic carbon accumulation first occurred in 40% water content group, in which a higher CO2 assimilation rate was also observed. The obvious inconsistency between chlorophyll fluorescence detection and CO2 exchange analysis is considered to be the result of the special structure and photosynthetic characteristics of LSCs. (C) 2012 Elsevier Masson SAS. All rights reserved.
英文摘要	Lichen soil crusts (LSCs) are an important stage during the development of biological soil crusts (BSCs). The photosynthetic characteristics of this stage are determined by both of the symbiotic and free-living cyanobacteria and algae in the crusts. In this study, the recovery rate, extent, pattern of chlorophyll fluorescence and CO2 exchange in LSCs were detected after rehydration under different water contents (5%, 20% and 40%). The results showed that original fluorescence (Fo) of each group increased dramatically after rehydration and then reached a plateau to steady state; however both maximum quantum efficiency of PS II photochemistry (Fv/Fm) and the ratio of variable fluorescence at different recovery time to the maximal value during the recovery period (Fv/Fv(max)) showed a similar and corresponding "three steps" recovery pattern. At the end of experiment, Fv/Fm of 20% water content group recovered to the highest level (0.45), although no obvious difference in the Fv/Fm was found among the three water content groups within the first 4 h. Additionally, after the rehydration CO2 release from LSCs (under the light) gradually decreased, and the organic carbon accumulation first occurred in 40% water content group, in which a higher CO2 assimilation rate was also observed. The obvious inconsistency between chlorophyll fluorescence detection and CO2 exchange analysis is considered to be the result of the special structure and photosynthetic characteristics of LSCs. (C) 2012 Elsevier Masson SAS. All rights reserved.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Ecology ; Soil Science
研究领域[WOS]	Environmental Sciences & Ecology ; Agriculture
关键词[WOS]	NAMIB FOG DESERT ; COLORADO PLATEAU ; WATER RELATIONS ; CYANOBACTERIAL CRUSTS ; SUCCESSIONAL STAGES ; ENERGY-DISSIPATION ; EPIPHYTIC LICHENS ; NITROGEN-FIXATION ; ALGAL CRUSTS ; CARBON
收录类别	SCI
资助信息	National Natural Science Foundation of China [30870470, 31170464]
语种	英语
WOS记录号	WOS:000316506800012
公开日期	2013-10-31
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/19354]
专题	水生生物研究所_藻类生物学及应用研究中心_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China 2.Wuhan Univ Technol, Dept Biol Sci & Biotechnol, Wuhan 430070, Peoples R China
推荐引用方式 GB/T 7714	Wu, Li,Lan, Shubin,Zhang, Delu,et al. Recovery of chlorophyll fluorescence and CO2 exchange in lichen soil crusts after rehydration[J]. EUROPEAN JOURNAL OF SOIL BIOLOGY,2013,55:77-82.
APA	Wu, Li,Lan, Shubin,Zhang, Delu,&Hu, Chunxiang.(2013).Recovery of chlorophyll fluorescence and CO2 exchange in lichen soil crusts after rehydration.EUROPEAN JOURNAL OF SOIL BIOLOGY,55,77-82.
MLA	Wu, Li,et al."Recovery of chlorophyll fluorescence and CO2 exchange in lichen soil crusts after rehydration".EUROPEAN JOURNAL OF SOIL BIOLOGY 55(2013):77-82.