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题名: Mechanism of biocrusts boosting and utilizing non-rainfall water in Hobq Desert of China
作者: Ouyang, Hailong1, 2; Lan, Shubin1; Yang, Haijian1; Hu, Chunxiang1
关键词: Non-rainfall water ; Accumulation patterns ; Sources ; Influencing factors ; Photosynthetic activities ; CO2 exchange
刊名: APPLIED SOIL ECOLOGY
发表日期: 2017-11-01
DOI: 10.1016/j.apsoil.2017.07.024
卷: 120, 页:70-80
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Soil Science
研究领域[WOS]: Agriculture
英文摘要: Non-rainfall water (NRW), as the most frequent water source of drylands, is significantly boosted by biocrusts. However, the mechanism of biocrustal promotion and utilization of NRW have been little studied. In this paper, the NRW accumulation patterns, photosynthetic activities and CO2 exchange of different biocrusts (2 cyanobacteria crusts-ACs, 1 cyanolichen crust-LC1, 1 green algae lichen crust-LC2, and 1 moss crust-MC) under NRW were studied through in situ mesocosm experiments in the Hobq Desert of China during the autumns of 2014 and 2015. Structural equation models showed that crustal properties feedback affected the degree of meteorological parameters on NRW accumulation, in which the effect of surface temperature gradually decreased with the development of biocrusts while that of subsoil temperature and light intensity increased. As for the sources, ca. 50% of NRW in ACs derived from subsoil but more than 78% from atmosphere in LCs and MC, and this pattern was obviously influenced by the recovery degree of photosynthetic activity. But the diel maximum NRW (NRWmax) were mainly determined by crust thickness, photoautotroph biomass and other properties. During NRW accumulation, the recovery of photosynthetic activity in ACs was the earliest, followed by that of LC2 and MC, LC1 never recovered. Whereas, the initial CO2 exchange of ACs and MC were often earlier than that of LC2, and the minimum diel NRWmax required by ACs, LC2, and MC to maintain carbon balance were ca. 0.08, 0.17, and 0.20 mm, respectively. Thus we proposed the application boundary of inoculation-based technology in drylands is the areas where the diel NRWmax exceed or equal 0.08 mm and carbon input under NRW last more than 2 h during NRW-abundant seasons.
关键词[WOS]: BIOLOGICAL SOIL CRUSTS ; WESTERN NEGEV DESERT ; ARID DRAINAGE-BASIN ; DEW FORMATION ; CO2 EXCHANGE ; ALGAL CRUSTS ; SAND DUNES ; ENVIRONMENTAL-FACTORS ; SUCCESSIONAL STAGES ; MICROBIOTIC CRUSTS
语种: 英语
项目资助者: National Natural Science Foundation of China(41573111 ; 31670456 ; 31300322)
WOS记录号: WOS:000411866600009
ISSN号: 0929-1393
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/35177
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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