globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.12054
论文题名:
Cloud shading and fog drip influence the metabolism of a coastal pine ecosystem
作者: Carbone M.S.; Park Williams A.; Ambrose A.R.; Boot C.M.; Bradley E.S.; Dawson T.E.; Schaeffer S.M.; Schimel J.P.; Still C.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期:2
起始页码: 484
结束页码: 497
语种: 英语
英文关键词: 13C ; Bishop pine ; Cloud shading ; Decomposition ; Fog drip ; Santa Cruz Island ; Soil respiration ; Stratus clouds
Scopus关键词: carbon ; air temperature ; cloud cover ; coastal zone ; decomposition ; evaporation ; fog ; forest ecosystem ; metabolism ; microbial activity ; soil respiration ; stratus ; article ; ecosystem ; metabolism ; pine ; United States ; weather ; California ; Carbon ; Ecosystem ; Pinus ; Weather ; California ; Channel Islands [California] ; Santa Cruz Island ; United States ; Pinus muricata
英文摘要: Assessing the ecological importance of clouds has substantial implications for our basic understanding of ecosystems and for predicting how they will respond to a changing climate. This study was conducted in a coastal Bishop pine forest ecosystem that experiences regular cycles of stratus cloud cover and inundation in summer. Our objective was to understand how these clouds impact ecosystem metabolism by contrasting two sites along a gradient of summer stratus cover. The site that was under cloud cover ~15% more of the summer daytime hours had lower air temperatures and evaporation rates, higher soil moisture content, and received more frequent fog drip inputs than the site with less cloud cover. These cloud-driven differences in environmental conditions translated into large differences in plant and microbial activity. Pine trees at the site with greater cloud cover exhibited less water stress in summer, larger basal area growth, and greater rates of sap velocity. The difference in basal area growth between the two sites was largely due to summer growth. Microbial metabolism was highly responsive to fog drip, illustrated by an observed ~3-fold increase in microbial biomass C with increasing summer fog drip. In addition, the site with more cloud cover had greater total soil respiration and a larger fractional contribution from heterotrophic sources. We conclude that clouds are important to the ecological functioning of these coastal forests, providing summer shading and cooling that relieve pine and microbial drought stress as well as regular moisture inputs that elevate plant and microbial metabolism. These findings are important for understanding how these and other seasonally dry coastal ecosystems will respond to predicted changes in stratus cover, rainfall, and temperature.© 2012 Blackwell Publishing Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62550
Appears in Collections:影响、适应和脆弱性

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作者单位: National Center for Ecological Analysis and Synthesis, Santa Barbara, CA 93101, United States; Department of Geography, University of California, Santa Barbara, CA, 93106, United States; Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, United States; Department of Integrative Biology, University of California, Berkeley, CA, 94720, United States; Natural Resource Ecology Lab, Colorado State University, Fort Collins, CO, 80523, United States; Biosystems Engineering and Soil Science Department, University of Tennessee, Knoxville, TN, 37996, United States; Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, 93106, United States; Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, 97331, United States

Recommended Citation:
Carbone M.S.,Park Williams A.,Ambrose A.R.,et al. Cloud shading and fog drip influence the metabolism of a coastal pine ecosystem[J]. Global Change Biology,2013-01-01,19(2)
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