Journal Title
Title of Journal: Plant Ecol
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Abbravation: Plant Ecology
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Publisher
Springer Netherlands
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Authors: Guangshui Chen Yusheng Yang Jianfen Guo Jinsheng Xie Zhijie Yang
Publish Date: 2010/07/28
Volume: 212, Issue: 2, Pages: 195-206
Abstract
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 oldgrowth 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 008 to 064 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 Sitespecific belowground carbon use efficiency BCUE root production per unit carbon used by roots and microbial associations varied from 010 to 087 contrasting with the common assumption of a constant BCUE Sitespecific FR/FS ranged from 009 to 071 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 r 2 = 0270 of this relationship resulted from deviations from assumptions of constant BCUE and a near steadystate belowground pools
Keywords:
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