Influence of dew on biomass and photosystem II activity of cyanobacterial crusts in the Hopq Desert, northwest China

CORC > 水生生物研究所 > 中科院水生所知识产出（2009年前） > 期刊论文

	Influence of dew on biomass and photosystem II activity of cyanobacterial crusts in the Hopq Desert, northwest China
	Rao, Benqiang 1,2,3; Liu, Yongding 1; Wang, Weibo 1,3; Hu, Chunxiang 1; Dunhai, Li 1; Lan, Shubin 1,3
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2009-12-01
卷号	41 期号:12 页码:2387-2393
关键词	Biological soil crust Dew Cyanobacteria Biomass Photosynthetic activity Rainfall Desertification Hopq Desert
ISSN号	0038-0717
通讯作者	Liu, YD, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, 7 DongHu S Rd, Wuhan 430072, Hubei, Peoples R China
中文摘要	Dew is an important water source for desert organisms in semiarid and arid regions. Both field and laboratory experiments were conducted to investigate the possible roles of dew in growth of biomass and photosynthetic activity within cyanobacterial crust. The cyanobacteria, Microcoleus vaginatus Gom. and Scytonema javanicum (Kutz.) Born et Flah., were begun with stock cultures and sequential mass cultivations, and then the field experiment was performed by inoculating the inocula onto shifting sand for forming cyanobacterial crust during late summer and autumn of 2007 in Hopq Desert, northwest China. Measurements of dew amount and Chlorophyll a content were carried out in order to evaluate the changes in crust biomass following dew. Also, we determined the activity of photosystem II(PSII) within the crust in the laboratory by simulating the desiccation/rehydration process due to dew. Results showed that the average daily dew amount as measured by the cloth-plate method (CPM) was 0.154 mm during fifty-three days and that the crust biomass fluctuated from initial inoculation of 4.3 mu g Chlorophyll a cm(-2) sand to 5.8-7.3 mu g Chlorophyll a cm(-2) crust when dew acted as the sole water source, and reached a peak value of approximately 8.2 mu g Chlorophyll a cm(-2) crust owing to rainfalls. It indicated that there was a highly significant correlation between dew amounts and crust moistures (r = 0.897 or r = 0.882, all P < 0.0001), but not a significant correlation between dew and the biomass (r = 0.246 or r = 0.257, all P > 0.05), and thus concluded that dew might only play a relatively limited role in regulating the crust biomass. Correspondingly, we found that rains significantly facilitated biomass increase of the cyanobacterial crust. Results from the simulative experiment upon rehydration showed that approximately 80% of PSII activity could be achieved within about 50 min after rehydration in the dark and at 5 degrees C, and only about 20% of the activity was light-temperature dependent. This might mean that dew was crucial for cyanobacterial crust to rapidly activate photosynthetic activity during desiccation and rehydration despite low temperatures and weak light before dawn. It also showed in this study that the cyanobacterial crusts could receive and retain more dew than sand, which depended on microclimatic characteristics and soil properties of the crusts. It may be necessary for us to fully understanding the influence of dew on regulating the growth and activity of cyanobacterial crust, and to soundly evaluate the crust's potential application in fighting desertification because of the available water due to dew. (C) 2009 Published by Elsevier Ltd.
英文摘要	Dew is an important water source for desert organisms in semiarid and arid regions. Both field and laboratory experiments were conducted to investigate the possible roles of dew in growth of biomass and photosynthetic activity within cyanobacterial crust. The cyanobacteria, Microcoleus vaginatus Gom. and Scytonema javanicum (Kutz.) Born et Flah., were begun with stock cultures and sequential mass cultivations, and then the field experiment was performed by inoculating the inocula onto shifting sand for forming cyanobacterial crust during late summer and autumn of 2007 in Hopq Desert, northwest China. Measurements of dew amount and Chlorophyll a content were carried out in order to evaluate the changes in crust biomass following dew. Also, we determined the activity of photosystem II(PSII) within the crust in the laboratory by simulating the desiccation/rehydration process due to dew. Results showed that the average daily dew amount as measured by the cloth-plate method (CPM) was 0.154 mm during fifty-three days and that the crust biomass fluctuated from initial inoculation of 4.3 mu g Chlorophyll a cm(-2) sand to 5.8-7.3 mu g Chlorophyll a cm(-2) crust when dew acted as the sole water source, and reached a peak value of approximately 8.2 mu g Chlorophyll a cm(-2) crust owing to rainfalls. It indicated that there was a highly significant correlation between dew amounts and crust moistures (r = 0.897 or r = 0.882, all P < 0.0001), but not a significant correlation between dew and the biomass (r = 0.246 or r = 0.257, all P > 0.05), and thus concluded that dew might only play a relatively limited role in regulating the crust biomass. Correspondingly, we found that rains significantly facilitated biomass increase of the cyanobacterial crust. Results from the simulative experiment upon rehydration showed that approximately 80% of PSII activity could be achieved within about 50 min after rehydration in the dark and at 5 degrees C, and only about 20% of the activity was light-temperature dependent. This might mean that dew was crucial for cyanobacterial crust to rapidly activate photosynthetic activity during desiccation and rehydration despite low temperatures and weak light before dawn. It also showed in this study that the cyanobacterial crusts could receive and retain more dew than sand, which depended on microclimatic characteristics and soil properties of the crusts. It may be necessary for us to fully understanding the influence of dew on regulating the growth and activity of cyanobacterial crust, and to soundly evaluate the crust's potential application in fighting desertification because of the available water due to dew. (C) 2009 Published by Elsevier Ltd.
学科主题	Soil Science
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
类目[WOS]	Soil Science
研究领域[WOS]	Agriculture
关键词[WOS]	BIOLOGICAL SOIL CRUSTS ; NEGEV DESERT ; ALGAL CRUSTS ; CRYPTOGAMIC CRUSTS ; ISRAEL ; SUCCESSION ; DEPOSITION ; PATTERNS
收录类别	SCI
资助信息	State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences [2008FBZ21]; Planning Committee of Inner Mongolia Autonomous Region ; Chinese Engineering
语种	英语
WOS记录号	WOS:000272062100003
公开日期	2010-10-13
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/152342/7466]
专题	水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China 2.Xinyang Normal Univ, Coll Life Sci, Xinyang 464000, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Rao, Benqiang,Liu, Yongding,Wang, Weibo,et al. Influence of dew on biomass and photosystem II activity of cyanobacterial crusts in the Hopq Desert, northwest China[J]. SOIL BIOLOGY & BIOCHEMISTRY,2009,41(12):2387-2393.
APA	Rao, Benqiang,Liu, Yongding,Wang, Weibo,Hu, Chunxiang,Dunhai, Li,&Lan, Shubin.(2009).Influence of dew on biomass and photosystem II activity of cyanobacterial crusts in the Hopq Desert, northwest China.SOIL BIOLOGY & BIOCHEMISTRY,41(12),2387-2393.
MLA	Rao, Benqiang,et al."Influence of dew on biomass and photosystem II activity of cyanobacterial crusts in the Hopq Desert, northwest China".SOIL BIOLOGY & BIOCHEMISTRY 41.12(2009):2387-2393.