Spatial and seasonal variations in soil respiration in a subtropical forest in Okinawa, Japan
Spatial and seasonal variations in soil respiration in a subtropical forest in Okinawa, Japan
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DOI：
10.1111/1440-1703.12386
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发表时间：
2023-02
影响因子：
2
通讯作者：
Kazuho Matsumoto;K. Terasawa;S. Taniguchi;M. Ohashi;Ayumi Katayama;T. Kume;Atsushi Takashima
中科院分区：
文献类型：
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作者：
Kazuho Matsumoto;K. Terasawa;S. Taniguchi;M. Ohashi;Ayumi Katayama;T. Kume;Atsushi Takashima
为阐明日本冲绳县羊原亚热带万年青阔叶天然林土壤呼吸（土壤CO2流出，Rs）特征，研究了Rs的时空变化及其影响因素。然后，我们将yearlyRs与其他森林中的值进行了比较。RS的空间变异（变异系数CV = 38.9%）与温度和土壤含水量的相关性不显著，而与地表枯落物覆盖度的相关性显著。7-10其季节变化与土壤温度呈指数关系（Q10= 2.16）。作为土壤温度的函数，我们估计2014年的年平均林分尺度Rs为5.17 μmol m−2s−1，土壤总碳流出量为1959 g C m−2year− 1。尽管表现出类似的季节性模式的时间森林，在这个生态系统中的R是非常高的全年，和年值是更高的天然成熟的森林。质量平衡方法表明，大量的地下碳分配的植物贡献的高CO2排放量的土壤。
To clarify soil respiration (soil CO2efflux,Rs) characteristics in a subtropical evergreen broad‐leaved natural forest in Yambaru, Okinawa, Japan, we examined spatiotemporal variation inRsand its determining factors. We then compared yearlyRswith the value in other forests. The spatial variation inRs(coefficient of variation [CV] = 38.9%) was not significantly related to temperature or soil water content but was evidently dependent on ground surface litter coverage.Rswas greater in summer (ca. 7–10 μmol m−2s−1), and its seasonal variation was exponentially related to soil temperature (Q10= 2.16). As a function of soil temperature, we estimated a yearly mean stand‐scaleRsof 5.17 μmol m−2s−1, and a total carbon efflux from the soil of 1959 g C m−2year−1for 2014. Despite showing similar seasonal patterns as those in temporal forests, theRsin this ecosystem is very high throughout the year, and the yearly value is much higher for natural mature forests. A mass balance approach suggests that the large amount of belowground carbon allocation of plants contributed to the high CO2emissions from the soils.