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Influence of dew on biomass and photosystem II activity of cyanobacterial crusts in the Hopq Desert, northwest China
Rao, Benqiang1,2,3; Liu, Yongding1; Wang, Weibo1,3; Hu, Chunxiang1; Dunhai, Li1; Lan, Shubin1,3; Liu, YD, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, 7 DongHu S Rd, Wuhan 430072, Hubei, Peoples R China
2009-12-01
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY
ISSN0038-0717
Volume41Issue:12Pages:2387-2393
AbstractDew 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.; 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.
SubtypeArticle
KeywordBiological Soil Crust Dew Cyanobacteria Biomass Photosynthetic Activity Rainfall Desertification Hopq Desert
Department[Rao, Benqiang; Liu, Yongding; Wang, Weibo; Hu, Chunxiang; Dunhai, Li; Lan, Shubin] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China; [Rao, Benqiang] Xinyang Normal Univ, Coll Life Sci, Xinyang 464000, Peoples R China; [Rao, Benqiang; Wang, Weibo; Lan, Shubin] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Subject AreaSoil Science
DOI10.1016/j.soilbio.2009.06.005
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Funding OrganizationState Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences [2008FBZ21]; Planning Committee of Inner Mongolia Autonomous Region ; Chinese Engineering ; 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 ; 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 ; 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
Indexed BySCI
Language英语
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000272062100003
WOS KeywordBIOLOGICAL SOIL CRUSTS ; NEGEV DESERT ; ALGAL CRUSTS ; CRYPTOGAMIC CRUSTS ; ISRAEL ; SUCCESSION ; DEPOSITION ; PATTERNS
Funding OrganizationState Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences [2008FBZ21]; Planning Committee of Inner Mongolia Autonomous Region ; Chinese Engineering ; 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 ; 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 ; 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
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/7466
Collection期刊论文
Corresponding AuthorLiu, YD, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, 7 DongHu S Rd, Wuhan 430072, Hubei, Peoples R China
Affiliation1.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
Recommended Citation
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.,...&Liu, YD, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, 7 DongHu S Rd, Wuhan 430072, Hubei, Peoples R China.(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.
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