Respiration as the main determinant of carbon balance in European forests
Respiration as the main determinant of carbon balance in European forests
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DOI：
10.1038/35009084
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发表时间：
2000-04-20
期刊：
影响因子：
64.8
通讯作者：
Jarvis, PG
中科院分区：
文献类型：
--
作者：
Valentini, R;Matteucci, G;Jarvis, PG
陆地生物圈与大气之间的碳交换是需要在《京都议定书》范围内评估的关键过程之一(1)。一些研究表明，陆地生物圈正在获得碳(2-8)，但这些估计主要是通过间接方法获得的，控制陆地碳交换的因素、其规模和主要位置仍在争论中。在这里，我们提供了1996年至1998年从15个欧洲森林收集的净生态系统碳交换数据，这些数据证实了许多欧洲森林生态系统作为碳汇的作用。年碳平衡的范围从每年每公顷每年6.6吨碳的吸收到近1吨碳公顷(-1)年的释放，不同森林之间的差异很大。数据表明，碳吸收随着纬度的降低而显著增加，而总初级生产力似乎在很大程度上与纬度无关。我们的观察表明，总的来说，生态系统的呼吸决定了生态系统的净碳交换。此外，要准确评估特定森林生态系统的碳平衡，对归一化差异植被指数的遥感或基于森林清单的估计可能是不够的。
Carbon exchange between the terrestrial biosphere and the atmosphere is one of the key processes that need to be assessed in the context of the Kyoto Protocol(1). Several studies suggest that the terrestrial biosphere is gaining carbon(2-8), but these estimates are obtained primarily by indirect methods, and the factors that control terrestrial carbon exchange, its magnitude and primary locations, are under debate. Here we present data of net ecosystem carbon exchange, collected between 1996 and 1998 from 15 European forests, which confirm that many European forest ecosystems act as carbon sinks. The annual carbon balances range from an uptake of 6.6 tonnes of carbon per hectare per year to a release of nearly 1 t C ha(-1) yr(-1), with a large variability between forests. The data show a significant increase of carbon uptake with decreasing latitude, whereas the gross primary production seems to be largely independent of latitude. Our observations indicate that, in general, ecosystem respiration determines net ecosystem carbon exchange. Also, for an accurate assessment of the carbon balance in a particular forest ecosystem, remote sensing of the normalized difference vegetation index or estimates based on forest inventories may not be sufficient.