Carbon allocation in forest ecosystems

作者：Creighton M. Litton, James W. Raich, Michael G. Ryan · 发表于：Global Change Biology · 年份：2007 · DOI：10.1111/j.1365-2486.2007.01420.x · 被引用次数：1089 · 研究领域：Plant Water Relations and Carbon Dynamics、Forest ecology and management、Forest Management and Policy

Abstract Carbon allocation plays a critical role in forest ecosystem carbon cycling. We reviewed existing literature and compiled annual carbon budgets for forest ecosystems to test a series of hypotheses addressing the patterns, plasticity, and limits of three components of allocation: biomass , the amount of material present; flux , the flow of carbon to a component per unit time; and partitioning , the fraction of gross primary productivity (GPP) used by a component. Can annual carbon flux and partitioning be inferred from biomass ? Our survey revealed that biomass was poorly related to carbon flux and to partitioning of photosynthetically derived carbon, and should not be used to infer either. Are component fluxes correlated ? Carbon fluxes to foliage, wood, and belowground production and respiration all increased linearly with increasing GPP (a rising tide lifts all boats). Autotrophic respiration was strongly linked to production for foliage, wood and roots, and aboveground net primary productivity and total belowground carbon flux (TBCF) were positively correlated across a broad productivity gradient. How does carbon partitioning respond to variability in resources and environment ? Within sites, partitioning to aboveground wood production and TBCF responded to changes in stand age and resource availability, but not to competition (tree density). Increasing resource supply and stand age, with one exception, resulted in increased partitioning to aboveground wood product...