DOI: 10.1002/jgrd.50300
论文题名: Soil respiration in an old-growth subtropical forest: Patterns, components, and controls
作者: Tan Z.-H. ; Zhang Y.-P. ; Liang N. ; Song Q.-H. ; Liu Y.-H. ; You G.-Y. ; Li L.-H. ; Yu L. ; Wu C.-S. ; Lu Z.-Y. ; Wen H.-D. ; Zhao J.-F. ; Gao F. ; Yang L.-Y. ; Song L. ; Zhang Y.-J. ; Munemasa T. ; Sha L.-Q.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 2981
结束页码: 2990
语种: 英语
Scopus关键词: Biogeochemistry
; Biological materials
; Carbon
; Climate change
; Organic compounds
; Soil moisture
; Temperature
; Coefficient of variation
; Gross primary production
; Relative contribution
; Soil organic matters
; Spatial variations
; Subtropical forests
; Temperature sensitivity
; Thermal acclimation
; Forestry
; biogeochemistry
; carbon budget
; climate change
; litterfall
; moisture content
; net primary production
; old-growth forest
; seasonality
; soil organic matter
; soil respiration
; spatial variation
; subtropical region
; China
英文摘要: The patterns, components, and controls of soil respiration in an old-growth subtropical forest were investigated using an automatic chamber system. We measured soil respiration in three treatments (control, trenching, litter removal) over 15 months. The annual total soil respiration (1248 gC m -2 yr-1) showed considerable spatial variation (coefficient of variation = 27.8%) within the forest. Thirty samples were required to obtain results within 10% of the mean value at a 95% confidential level. A distinctive cosine-like diel pattern of soil respiration was observed; the time lag between gross primary production and soil respiration at this scale was calculated to be 4-5 h. Seasonality of soil respiration was strong (∼1 μmol m-2 s-1 near the end of winter; ∼6 μmol m-2 s-1 in midsummer). No time lag was discerned between gross primary production and soil respiration at the seasonal scale. Soil temperature at 5 cm below surface can explain most (>91%) of the observed annual variation in soil respiration. The apparent respiration temperature sensitivity index (Q10 ) was 3.05. The lowest Q10 value was observed in winter, when soil moisture was low. Soil respiration was overestimated by a Q10 function during both dry and wet periods. The relative contributions of soil organic matter (RSOM ), litterfall decomposition (RL ), and root respiration (RR ) to total soil respiration are 65.25%, 18.73%, and 16.01%, respectively; the temperature sensitivity of these components differ: RL (Q10 = 7.22)>RSOM (2.73)>RR (1.65). This relationship between Q10 values for litter respiration, soil organic matter decomposition, and root respiration still holds after minimizing the confounding effect of moisture. A relatively constant substrate supply and/or thermal acclimation could account for the observed low-temperature sensitivity in root respiration. Given the high carbon stocks and fluxes, the old-growth subtropical forests of China seem important in the global carbon budget and climate change. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: 31200347
; 40571163
; 41071071
; 41271056
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63826
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, 650223 Kunming, China; Global Carbon Cycle Research Section, Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, 305-8506, Japan; Global Change Research Group, Key Laboratory of Tropical Forest Ecology, Chinese Academy of Sciences, 650223 Kunming, China; Ailaoshan Station for Subtropical Forest Studies, 676200, Jingdong, China; University of Chinese Academy of Sciences, Beijing 100094, China; Lijiang Ecological Station, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China; Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, United States
Recommended Citation:
Tan Z.-H.,Zhang Y.-P.,Liang N.,et al. Soil respiration in an old-growth subtropical forest: Patterns, components, and controls[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)