Annual basal area increment and growth duration of Pinus taeda in response to eight years of free‐air carbon dioxide enrichment
Annual basal area increment and growth duration of Pinus taeda in response to eight years of free‐air carbon dioxide enrichment
复制标题
火炬松年断面积增量和生长持续时间对八年自然二氧化碳富集的响应
DOI：
10.1111/j.1365-2486.2006.01189.x
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发表时间：
2006
影响因子：
11.6
通讯作者：
E. DE LUCIA
中科院分区：
文献类型：
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作者：
D. Moore;S. Aref;RINGO M. Ho;J. Pippen;J. Hamilton;E. DE LUCIA
据预测，二氧化碳的增加将提高森林生产力，尽管人们对这种反应的持续时间以及这种反应如何因降雨量、温度和其他环境变量的变化而改变还没有很好的了解。我们测量了暴露于自由空气CO2富集8年的快速生长的火炬松树木的断面积，并使用这些测量值来估计每月和每年的生长。我们在统计模型中使用这些测量来估计每年增长的开始和结束。CO2浓度升高使树木断面积增加13- 27%。在大多数年份中，暴露于升高的CO2增加了生长速率，但没有增加活跃生长期的持续时间。除极端干旱和严重冰暴后的1年外，BAI与活跃生长期的降雨量呈正相关。CO2浓度升高引起的BAI相对增强的年际变化与温度和降雨量密切相关，在水汽压亏缺高的年份最大。在本实验的前8年中，没有证据表明生长刺激的系统性减少，这表明氮可用性引起的CO2响应的假设限制尚未发生。
Rising CO2 is predicted to increase forest productivity, although the duration of the response and how it might be altered by variation in rainfall, temperature and other environmental variables are not well understood. We measured the basal area of rapidly growing Pinus taeda trees exposed to free‐air CO2 enrichment for 8 years and used these measurements to estimate monthly and annual growth. We used these measurements in a statistical model to estimate the start and end of growth in each year. Elevated CO2 increased the basal area increment (BAI) of trees by 13–27%. In most years, exposure to elevated CO2 increased the growth rate but not the duration of the active growth period. With the exception of 1 year following an extreme drought and a severe ice storm, BAI was positively correlated with the amount of rainfall during the active growth period. The interannual variation in the relative enhancement of BAI caused by elevated CO2 was strongly related to temperature and rainfall, and was greatest in years with high vapor pressure deficit. There was no evidence of a systematic reduction in the stimulation of growth during the first 8 years of this experiment, suggesting that the hypothesized limitation of the CO2 response caused by nitrogen availability has yet to occur.
Imaizumi, N.：“水稻小穗光合碳代谢的特征。”
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