Tropical rain forest tree growth and atmospheric carbon dynamics linked to interannual temperature variation during 1984-2000
Tropical rain forest tree growth and atmospheric carbon dynamics linked to interannual temperature variation during 1984-2000
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DOI：
10.1073/pnas.0935903100
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发表时间：
2003-05-13
影响因子：
11.1
通讯作者：
Clark, DB
中科院分区：
文献类型：
--
作者：
Clark, DA;Piper, SC;Clark, DB
在1984-2000年期间，哥斯达黎加的热带雨林中的古老的热带雨林的冠层树木的生长，年间变化> 2倍。在这16年期间，树木的年直径增量与年平均日最低温度呈负相关。树木的生长变化也负协变的陆地热带地区作为一个整体的净碳交换，推断从近极点到极点的测量大气中的二氧化碳（CO2）解释的逆示踪剂运输模型。在1997-1998年创纪录的高温厄尔尼诺（n）期间，树木生长量大幅减少，并推断热带地区向大气中释放了大量二氧化碳。这些和最近的其他研究结果与过去二十年中较温暖的年份热带森林净初级生产量减少的情况相一致。正如最近的过程模型研究所预测的那样，热带森林生产力对持续气候变化的敏感性将加速大气二氧化碳积累的速度。
During 1984-2000, canopy tree growth in old-growth tropical rain forest at La Selva, Costa Rica, varied > 2-fold among years. The trees' annual diameter increments in this 16-yr period were negatively correlated with annual means of daily minimum temperatures. The tree growth variations also negatively covaried with the net carbon exchange of the terrestrial tropics as a whole, as inferred from nearly pole-to-pole measurements of atmospheric carbon dioxide (CO2) interpreted by an inverse tracer-transport model. Strong reductions in tree growth and large inferred tropical releases of CO2 to the atmosphere occurred during the record-hot 1997-1998 El Ni (n) over tildeo. These and other recent findings are consistent with decreased net primary production in tropical forests in the warmer years of the last two decades. As has been projected by recent process model studies, such a sensitivity of tropical forest productivity to on-going climate change would accelerate the rate of atmospheric CO2 accumulation.