DOI: 10.1016/j.foreco.2014.11.009
Scopus记录号: 2-s2.0-84912144436
论文题名: Autotrophic and heterotrophic respiration of a poplar plantation chronosequence in northwest China
作者: Yan M. ; Guo N. ; Ren H. ; Zhang X. ; Zhou G.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 337 起始页码: 119
结束页码: 125
语种: 英语
英文关键词: Forest ecosystem
; Poplar plantation
; Soil CO2 emission
; Stand age
Scopus关键词: Biomass
; Budget control
; Carbon dioxide
; Ecosystems
; Rhodium
; Soils
; Temperature
; Autotrophic and heterotrophic respirations
; Autotrophic respiration
; Forest ecosystem
; Heterotrophic respiration
; Poplar plantation
; Seasonal variation
; Soil CO
; Stand age
; Forestry
; autotrophy
; biological production
; carbon budget
; chronosequence
; deciduous forest
; forest floor
; heterotrophy
; plantation
; respiration
; stand structure
; trench
; Carbon Dioxide
; Ecosystems
; Emission
; Forests
; Populus
; Soil
; China
英文摘要: The partitioning of soil respiration is helpful for understanding the mechanism of soil CO2 production and for estimating net forest C budget. We investigated heterotrophic (Rh) and autotrophic (Ra) components of soil CO2 efflux (Rs) in a poplar chronosequence (3-, 8-, and 15-yr-old) using a trenching method in 2007 and 2008. Our results showed that Rh and Ra varied with stand age. Mean Rh increased from 1.85μmolm-2s-1 in the 3-yr-old stand to 2.59μmolm-2s-1 in the 15-yr-old stand, while Ra decreased from 3.41μmolm-2s-1 in the 3-yr-old stand to 1.89μmolm-2s-1 in the 15-yr-old stand. There was a significant stand-age effect on Ra. Autotrophic respiration in the three stands all peaked in June, while the maximum Rh and soil temperature occurred in July. The seasonal variations of Ra and Rh could be well explained by soil temperature (P<0.01). The contribution of Ra to Rs during the growing season was 57.1% averaged over the three stands. We found that Rh was positively correlated with dead fine root biomass (P<0.01) and with forest floor litter mass (P<0.05), and that Ra was significantly correlated with live fine root biomass. The root respiration significantly decreased with stand age, which was explained by a decrease in live fine root biomass over the age sequence, whereas the increase of heterotrophic respiration could be attributed predominantly to an increase in the labile C input with stand age. Our results highlight the importance of stand-age effects on different components of soil respiration and its significance to the estimation of forest C sink potential over a rotation. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65609
Appears in Collections: 影响、适应和脆弱性
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作者单位: College of Environmental Science and Engineering, Taiyuan University of Technology, 79 Yingzexi Street, Taiyuan, China; State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun Xiangshan, Haidian District, Beijing, China
Recommended Citation:
Yan M.,Guo N.,Ren H.,et al. Autotrophic and heterotrophic respiration of a poplar plantation chronosequence in northwest China[J]. Forest Ecology and Management,2015-01-01,337