Change in CO2 balance under a series of forestry activities in a cool-temperate mixed forest with dense undergrowth
Change in CO2 balance under a series of forestry activities in a cool-temperate mixed forest with dense undergrowth
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DOI：
10.1111/j.1365-2486.2008.01795.x
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发表时间：
2009-05-01
影响因子：
11.6
通讯作者：
Fujinuma, Yasumi
中科院分区：
文献类型：
--
作者：
Takagi, Kentaro;Fukuzawa, Karibu;Fujinuma, Yasumi
为了评价采伐混交林和人工林对CO2交换的影响，在日本北海道的针阔混交林中进行了连续4.5年的CO2通量涡度相关测量和土壤呼吸测量。混交林是一个弱的碳汇（净生态系统交换量为-44gCm（-2）yr（-1）），在皆伐后成为一个大的碳源（569 gCm（-2）yr（-1））。但随着初级生产力（GPP）的增加，收获年的大排放量在随后的2年中迅速下降（分别为495和153 g Cm（-2）yr（-1）），而生态系统总呼吸（RE）保持相对稳定。GPP的快速增加归因于林下种矮生竹生物量和光合活性的增加。皆伐后3年土壤呼吸增加，第1年主要是由于林隙差距比的变化，第2年主要是由于竹林根系呼吸增加。土壤呼吸的比例增加到RE从森林的44%，近100%皆伐后，和地上部分的植被贡献很小，虽然呼吸室测量结果表明，均伐后的异质性土壤条件。
To evaluate the effects on CO2 exchange of clearcutting a mixed forest and replacing it with a plantation, 4.5 years of continuous eddy covariance measurements of CO2 fluxes and soil respiration measurements were conducted in a conifer-broadleaf mixed forest in Hokkaido, Japan. The mixed forest was a weak carbon sink (net ecosystem exchange, -44 g C m(-2) yr(-1)), and it became a large carbon source (569 g C m(-2) yr(-1)) after clearcutting. However, the large emission in the harvest year rapidly decreased in the following 2 years (495 and 153 g C m(-2) yr(-1), respectively) as the gross primary production (GPP) increased, while the total ecosystem respiration (RE) remained relatively stable. The rapid increase in GPP was attributed to an increase in biomass and photosynthetic activity of Sasa dwarf bamboo, an understory species. Soil respiration increased in the 3 years following clearcutting, in the first year mainly owing to the change in the gap ratio of the forest, and in the following years because of increased root respiration by the bamboo. The ratio of soil respiration to RE increased from 44% in the forest to nearly 100% after clearcutting, and aboveground parts of the vegetation contributed little to the RE although the respiration chamber measurements showed heterogeneous soil condition after clearcutting.