globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2013.10.032
Scopus记录号: 2-s2.0-84891746251
论文题名:
Long-term variability and environmental control of the carbon cycle in an oak-dominated temperate forest
作者: Xie J.; Chen J.; Sun G.; Chu H.; Noormets A.; Ouyang Z.; John R.; Wan S.; Guan W.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2014
卷: 313
起始页码: 319
结束页码: 328
语种: 英语
英文关键词: Ecosystem respiration ; Eddy-covariance ; Gross ecosystem productivity ; Net ecosystem exchange of carbon ; Seasonal and interannual variability ; Temperate deciduous forest
Scopus关键词: Ecosystem respiration ; Eddy-covariance ; Gross ecosystem productivities ; Net ecosystem exchange ; Seasonal and interannual variability ; Temperate deciduous forest ; Carbon ; Climate change ; Ecosystems ; Environmental engineering ; Environmental management ; Productivity ; Forestry ; annual variation ; autumn ; carbon cycle ; deciduous forest ; ecosystem ; forest inventory ; leaf area index ; net ecosystem exchange ; photosynthetically active radiation ; soil temperature ; summer ; temperate forest ; warming ; winter ; woodland ; Carbon ; Ecosystems ; Forestry ; Productivity ; Seasonal Variation ; Ohio ; United States
英文摘要: Our understanding of the long-term carbon (C) cycle of temperate deciduous forests and its sensitivity to climate variability is limited due to the large temporal dynamics of C fluxes. The goal of the study was to quantify the effects of environmental variables on the C balance in a 70-year-old mixed-oak woodland forest over a 7-year period in northwest Ohio, USA. The net ecosystem exchanges (NEE) of C were measured using the eddy-covariance technique. Long-term mean NEE, ecosystem respiration (ER), and gross ecosystem productivity (GEP) were -339±34, 1213±84, and 1552±82gCm-2year-1, respectively. Warming increased ER more than GEP when the available water was not limited, but decreased GEP more than ER when the available water was limited, resulting in decreasing net C fluxes under both conditions. The decreasing net C sink in summer was associated with increasing air temperature (Ta) in spring. The leaf area index (LAI), photosynthetically-active radiation (PAR), and Ta were the most important determinants of NEE for spring, summer, and winter, respectively; however, these variables failed to explain NEE for autumn. The most important determinants of ER and GEP were soil temperature (Ts) in spring, Ta and PAR in summer, and Ta in autumn. Ta was the only control of ER in winter. The annual variation in NEE was larger than that of GEP or ER. The controls of GEP on NEE were more pronounced seasonally and annually than those of ER. The annual GEP was consistently more variable than the annual ER. GEP was also seasonally and annually correlated with ER. Practical models derived from different combinations of independent variables effectively predicted 87%, 80%, and 93% of the monthly variability in NEE, ER, and GEP, respectively. We concluded that the variability in C fluxes was more responsive to increasing Ta and Ts than to variations in seasonal and annual precipitation. The study implies that a warmer climate is likely to reduce the forest productivity and C-sink capacity of oak ecosystems in the future, especially in instances when water inputs become limiting. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66160
Appears in Collections:影响、适应和脆弱性

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作者单位: College of Soil and Water Conservation, Beijing Forestry University, 35 East Qinghua Road, Haidian District, Beijing 100083, China; Department of Environmental Sciences, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606, United States; International Center for Ecology, Meteorology and Environment (IceMe), School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China; Eastern Forest Environmental Threat Assessment Center, Southern Research Station, USDA Forest Service, 920 Main Campus Dr., Suite 300, Venture II, Raleigh, NC 27606, United States; Department of Forestry and Environmental Resources, North Carolina State University, Campus Box 7260, 920 Main Campus Dr., Raleigh, NC 27606, United States; Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng, Henan 475004, China; College of Nature Conservation, Beijing Forestry University, Beijing 100083, China

Recommended Citation:
Xie J.,Chen J.,Sun G.,et al. Long-term variability and environmental control of the carbon cycle in an oak-dominated temperate forest[J]. Forest Ecology and Management,2014-01-01,313
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