CO2 and water vapor exchange of a larch forest in northern Japan-猫眼课题宝

DOI：

10.3402/tellusb.v55i2.16753

发表时间：

2003-01

期刊：

Tellus B: Chemical and Physical Meteorology

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

T. Hirano;R. Hirata;Y. Fujinuma;N. Saigusa;S. Yamamoto;Y. Harazono;Masayuk Takada;K. Inukai;G. Inoue

东亚北部以落叶松为主的森林分布广泛，可能在全球碳循环中发挥重要作用。然而，在东亚，基于长期通量测量的关于落叶松森林二氧化碳平衡的知识非常有限。因此，2000年在日本北海道一个平坦地形上的落叶松人工林开始了一项长期通量测量，以获得更多关于落叶松森林二氧化碳和能量平衡的信息。2000年9月~ 2001年8月，生态系统净CO2交换（NEE）随物候和气候的年周期变化。生长季节5 - 9月的6个月NEE为负；这一时期落叶松生态系统为碳汇，峰值强度为-0.38 mol m−2 d−1。在11 ~ 4月的无叶季节，森林生态系统的碳源强度为0 ~ 0.05 mol m−2 d−1。从2000年9月到2001年8月，NEE为−24.4 ~−32.4 mol m−2 yr−1(=−293 ~−389 gC m−2 yr−1)；该值与其他温带森林报告的值一致。同期的年蒸散量为367 mm，仅为年降水量的29%。

In the northern part of East Asia, forests dominated by larch are extensively distributed and probably play an important role in the global carbon cycle. However, a knowledge of the CO2 balance of larch forests based on long-term flux measurements is very restricted in East Asia. Thus, a long-term flux measurement has been started in 2000 at a larch plantation on a flat terrain in Hokkaido, Japan to obtain more information on the CO2 and energy balances of larch forests. From September 2000 to August 2001 the net ecosystem CO2 exchange (NEE) changed seasonally in accordance with the annual cycles of phenology and climate. NEE was negative for six months of the growing season, May—September; the larch ecosystem was a carbon sink with a peak intensity of –0.38 mol m−2 d−1 for this period. In the leafless season from November to April the forest ecosystem was a carbon source with an intensity ranging between 0 and 0.05 mol m−2 d−1. Annual NEE from September 2000 to August 2001 was −24.4 to −32.4 mol m−2 yr−1 (=−293 to −389 gC m−2 yr−1); this value is compatible with those reported from other temperate forests. Annual evapotranspiration for the same period was 367 mm, which was only 29% of annual precipitation.

CO2 and water vapor exchange of a larch forest in northern Japan

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