Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth

Jianwu Tang; Sebastiaan Luyssaert; Andrew D. RichardsonWerner KutschIvan A. Janssens

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Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth

机译：Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth

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The traditional view of forest dynamics originated by Kira and Shidei Kira T, Shidei T (1967) Jap J Ecol 17:70–87 and Odum Odum EP (1969) Science 164(3877):262–270 suggests a decline in net primary productivity (NPP) in aging forests due to stabilized gross primary productivity (GPP) and continuously increased autotrophic respiration (Ra). The validity of these trends in GPP and Ra is, however, very difficult to test because of the lack of long-term ecosystem-scale field observations of both GPP and Ra. Ryan and colleagues Ryan MG, Binkley D, Fownes JH (1997) Ad Ecol Res 27:213–262 have proposed an alternative hypothesis drawn from site-specific results that aboveground respiration and belowground allocation decreased in aging forests. Here, we analyzed data from a recently assembled global database of carbon fluxes and show that the classical view of the mechanisms underlying the age-driven decline in forest NPP is incorrect and thus support Ryan's alternative hypothesis. Our results substantiate the agedriven decline in NPP, but in contrast to the traditional view, both GPP and Ra decline in aging boreal and temperate forests. We find that the decline in NPP in aging forests is primarily driven by GPP, which decreases more rapidly with increasing age than Ra does, but the ratio of NPP/GPP remains approximately constant within a biome. Our analytical models describing forest succession suggest that dynamic forest ecosystem models that follow the traditional paradigm need to be revisited.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第24期|8856-8860|共5页
作者
Jianwu Tang; Sebastiaan Luyssaert; Andrew D. RichardsonWerner KutschIvan A. Janssens;
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作者单位

Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138;

Thünen Institute of Climate-Smart Agriculture, Federal Research Institute for Rural Areas, Forestry and Fisheries, 38116 Braunschweig, Germany;

Department of Biology, University of Antwerp, B-2610 Wilrijk, BelgiumThe Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
chronosequence; plant respiration; carbon use efficiency; ecosystem development; eddy covariance;

Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth

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