Carbon cycling and budget in a forested basin of southwestern Hokkaido, northern Japan
Carbon cycling and budget in a forested basin of southwestern Hokkaido, northern Japan
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DOI：
10.1007/s11284-005-0048-7
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发表时间：
2005-03
影响因子：
2
通讯作者：
H. Shibata;T. Hiura;Y. Tanaka;K. Takagi;T. Koike
中科院分区：
文献类型：
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作者：
H. Shibata;T. Hiura;Y. Tanaka;K. Takagi;T. Koike
为了评估森林生态系统抵御全球气候变化的功能以及生态系统对这些变化的响应，年度固碳量的量化非常重要。研究了日本北方Tomakomai实验林Horonai河流域冷温带落叶林生态系统碳的年循环和收支。作为IGBP-TEMA项目的一部分，在1999-2001年对该流域的净生态系统交换、土壤呼吸、生物量增加、凋落物、土壤溶液化学和河流输出进行了观测。我们发现，258 g C m− 2 year − 1每年被隔离为森林流域的净生态系统交换（NEE）。向河流中排放的碳为4 g C m− 2 year −1（约占NEE的2%），主要由溶解无机碳（DIC）组成。43%的净生态系统生产力（NEP）保留在植被中，而57%的NEP被固定在土壤中，表明固定碳从地上向地下的转移是土壤净碳积累的重要过程。从地上植被迁移到土壤中的有机碳主要积累在土壤的固相中，结果是溶解有机碳的输出量小于溶解无机碳。研究结果表明，在日本北方北海道西南部的冷温性落叶林生态系统中，地上和地下碳通量的相互作用是决定碳固定速率和碳固定时间的重要过程。
Quantification of annual carbon sequestration is very important in order to assess the function of forest ecosystems in combatting global climate change and the ecosystem responses to those changes. Annual cycling and budget of carbon in a forested basin was investigated to quantify the carbon sequestration of a cool-temperate deciduous forest ecosystem in the Horonai stream basin, Tomakomai Experimental Forest, northern Japan. Net ecosystem exchange, soil respiration, biomass increment, litterfall, soil-solution chemistry, and stream export were observed in the basin from 1999–2001 as a part of IGBP-TEMA project. We found that 258 g C m−2year−1was sequestered annually as net ecosystem exchange (NEE) in the forested basin. Discharge of carbon to the stream was 4 g C m−2year−1(about 2% of NEE) and consisted mainly of dissolved inorganic carbon (DIC). About 43% of net ecosystem productivity (NEP) was retained in the vegetation, while about 57% of NEP was sequestered in soil, suggesting that the movement of sequestered carbon from aboveground to belowground vegetation was an important process for net carbon accumulation in soil. The derived organic carbon from aboveground vegetation that moved to the soil mainly accumulated in the solid phase of the soil, with the result that the export of dissolved organic carbon to the stream was smaller than that of dissolved inorganic carbon. Our results indicated that the aboveground and belowground interaction of carbon fluxes was an important process for determining the rate and retention time of the carbon sequestration in a cool-temperate deciduous forest ecosystem in the southwestern part of Hokkaido, northern Japan.