Relationships between carbon allocation and partitioning of soil respiration across world mature forests

被引:1
作者
Guang-shui Chen
Yu-sheng Yang
Jian-fen Guo
Jin-sheng Xie
Zhi-jie Yang
机构
[1] Fujian Normal University,School of Geographical Sciences
来源
Plant Ecology | 2011年 / 212卷
关键词
Soil CO; efflux; Root respiration; Litterfall; Belowground carbon use efficiency;
D O I
暂无
中图分类号
学科分类号
摘要
Partitioning of soil CO2 flux (FS) into autotrophic and heterotrophic components depends on how the plant carbon is allocated above- vs. belowground and how the belowground carbon is allocated for respiration and production of roots and their microbial associations. Data of litterfall (FA), root respiration (FR), and FS of world old-growth or mature forests (≥45 ages) were compiled, and the relationship between carbon allocation above- vs. belowground (indexed as the FA/FS ratio) and FS partitioning (indexed as the FR/FS ratio) was examined. The FA/FS ratio ranged from 0.08 to 0.64 and was positively correlated with mean annual air temperature and mean annual precipitation. The ratio increased from boreal to temperate to tropical forests, and was higher in broadleaved forests than in coniferous forests. Site-specific belowground carbon use efficiency (BCUE, root production per unit carbon used by roots and microbial associations) varied from 0.10 to 0.87, contrasting with the common assumption of a constant BCUE. Site-specific FR/FS ranged from 0.09 to 0.71 and increased with FS due to a decrease in BCUE. Deciduousness had a significant effect on the FR/FS ratios, with FR/FS ratios greater in deciduous forests than in evergreen forests. Methods of separating root respiration from soil heterotrophic respiration had a significant effect on estimated FR/FS. The estimated FR/FS ratio was negatively related to the FA/FS ratio, indicating that factors favouring carbon allocation belowground over aboveground will increase the autotrophic contribution to total soil respiration. The relatively low explaining power (r2 = 0.270) of this relationship resulted from deviations from assumptions of constant BCUE and a near steady-state belowground pools.
引用
收藏
页码:195 / 206
页数:11
相关论文
共 288 条
[1]  
Bolstad PV(2004)Component and whole-system respiration fluxes in northern deciduous forests Tree Physiol 24 493-504
[2]  
Davis KJ(2004)A global relationship between the hetero-trophic and autotrophic components of soil respiration? Glob Chang Biol 10 1756-1766
[3]  
Martin J(2004)Contribution of root respiration to soil surface CO Tree Physiol 24 1387-1395
[4]  
Cook BD(2004) flux in a boreal black spruce chronosequence Glob Chang Biol 10 473-487
[5]  
Wang W(1999)Net primary production and net ecosystem production of a boreal black spruce wildfire chronosequence Soil Sci Soc Am J 63 1848-1855
[6]  
Bond-Lamberty B(1993)A climate change scenario for carbon dioxide and dissolved organic carbon fluxes from a temperate forest soil. Drought and rewetting effects Can J For Res 23 1402-1407
[7]  
Wang CK(2000)Contributions of aboveground litter, belowground litter, and root respiration to total soil respiration in a temperate mixed hardwood forest Soil Biol Biochem 32 1625-1635
[8]  
Gower ST(2004)Biotic and abiotic factors controlling soil respiration rates in Ecol Appl 14 72-88
[9]  
Bond-Lamberty B(2005) stand Acta Ecologica Sinica 25 2824-2829
[10]  
Wang CK(2008)Respiration from a tropical forest ecosystem: partitioning of sources and low carbon use efficiency J Plant Ecol 32 1285-1293