期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 149, 期 9, 页码 1531-1540出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2009.04.006
关键词
Labile carbon; Non-structural carbohydrates; Net primary production (NPP); Net ecosystem production (NEP); Respiration; Ecosystem; Carbon cycle; Photosynthesis
资金
- U.S. Department of Energy's Office of Science (BER) [DE-FC03-90ER610100]
- Midwestern Regional Center of the National Institute for Climatic Change Research at Michigan Technological University [DE-FC02-06ER64158]
- USDA Forest Service [06-JV-11242300-145]
Labile carbon (C), which is principally comprised of non-structural carbohydrates, is an essential intermediary between C assimilation and structural growth in deciduous forests. We developed a new approach that combined meteorological and biometric C cycling data for a mixed deciduous forest in Michigan, USA, to provide novel estimates of whole-ecosystem labile C production and reallocation to structural net primary production (NPP). We substantiated inferred seasonal patterns of labile C production and reallocation to structural NPP with measurements of Populus grandidentata and Quercus rubra wood non-structural carbohydrate concentration and mass over two years. Our analysis showed that 55% of annual net canopy C assimilate (A(c)) was first allocated to labile C production rather than to immediate structural NPP. Labile C produced during the latter half of summer later supported dormant-season structural growth and respiration, with 34% of structural NPP in a given year requiring labile C stored during previous years. Seasonal changes in wood non-structural carbohydrate concentration and mass generally corroborated inferred temporal patterns of whole-ecosystem labile C production and reallocation to structural NPP. Our findings confirm that disparities can arise between same-year meteorological and biometric net ecosystem production when meteorologically measured C assimilation and biometrically measured growth are asynchronous because of temporary photosynthate allocation to labile C storage. We conclude that a broader understanding of labile C production and reallocation at the ecosystem scale is important to interpreting lagged canopy C cycling and structural growth processes. (C) 2009 Elsevier B.V. All rights reserved.
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