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升高的大气二氧化碳可以提高森林的第一生产力

已有 2245 次阅读 2011-7-17 16:46 |个人分类:生活点滴1|系统分类:科研笔记|关键词:二氧化碳浓度升高| 二氧化碳浓度升高

二氧化碳浓度升高对植物体生长的影响到底是怎样的一直是个争论不休的话题。近日,美国科学家发现升高的二氧化碳可以提高森林的第一生产力,增大碳汇(C sink),但对土壤的碳汇增加影响不大,他们12年的试验成果发表在Ecology Letters (IF=15.253)上.
 
Ecol Lett. 2011 Apr;14(4):349-57. doi: 10.1111/j.1461-0248.2011.01593.x. Epub 2011 Feb 9.
   
Increases in the flux of carbon belowground stimulate nitrogen uptake and sustain the long-term enhancement of forest productivity under elevated CO₂.
  
Source

Program of Ecology, Evolution, and Conservation Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61802, USA.

Abstract

The earth's future climate state is highly dependent upon changes in terrestrial C storage in response to rising concentrations of atmospheric CO₂. Here we show that consistently enhanced rates of net primary production (NPP) are sustained by a C-cascade through the root-microbe-soil system; increases in the flux of C belowground under elevated CO₂ stimulated microbial activity, accelerated the rate of soil organic matter decomposition and stimulated tree uptake of N bound to this SOM. This process set into motion a positive feedback maintaining greater C gain under elevated CO₂ as a result of increases in canopy N content and higher photosynthetic N-use efficiency. The ecosystem-level consequence of the enhanced requirement for N and the exchange of plant C for N belowground is the dominance of C storage in tree biomass but the preclusion of a large C sink in the soil.

© 2011 Blackwell Publishing Ltd/CNRS.

  

全文链接:    

http://onlinelibrary.wiley.com/doi/10.1111/j.1461-0248.2011.01593.x/abstract

 



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