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Forest canopy productivity index

机译:林冠生产力指数

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SIR—Increased carbon dioxide concentrations can stimulate the productivity of terrestrial vegetation and thereby alter the relationships between anthropogenic carbon emissions, atmospheric CO_2 concentrations and climate change, This must therefore be taken into account when policy options for climate control are being assessed. The representation of increased CO_2 on a global scale should come from models, but the growth and carbon storage of different vegetation types in controlled, CO_2-enrichedatmospheres must be determined experimentally in order to test assumptions made in such models. Critical mechanistic model components (for example, photosynthesis and transpiration) can be compared with experimental data, but we do not have enough experimental data on the growth of trees to evaluate models of forest responses to rising CO_2. Results of the few field experiments that have investigated tree responses beyond the seedling stage are difficult to generalize and extrapolate. I suggest that some of this difficulty derives from the use of plant dry mass as the primaty indicator of response. A more robust and conceptually more useful measure of response is the annual production of wood per unit of leaf area, which I refer to. here as canopy productivity index (CPI; formerly called growth efficiency).
机译:SIR-增加的二氧化碳浓度可以刺激陆地植被的生产力,从而改变人为碳排放量,大气中CO_2浓度与气候变化之间的关系。因此,在评估气候控制的政策选择时必须考虑这一点。在全球范围内增加的CO_2的表示应来自模型,但是必须通过实验确定在受控的富含CO_2的大气中不同植被类型的生长和碳储量,以便检验在此类模型中做出的假设。可以将关键的机械模型组成部分(例如,光合作用和蒸腾作用)与实验数据进行比较,但是我们没有足够的树木生长实验数据来评估森林对CO_2上升响应的模型。很少有田间试验的结果调查过苗期后的树木响应,很难一概而论。我建议,这种困难的一部分源于使用植物干重作为响应的主要指标。一种更有效且在概念上更有用的响应度量是我所指的每单位叶面积的木材年产量。这里是冠层生产力指数(CPI;以前称为增长效率)。

著录项

  • 来源
    《Nature》 |1996年第6583期|p.564|共1页
  • 作者

    R. J Norby;

  • 作者单位

    Envlronmental Sciences Division, Oak Ridge National Laboratory, oak Ridge, Tennessee 37831-6422, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);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 eng
  • 中图分类 自然科学总论;
  • 关键词

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