Inter-annual variation of soil respiration and its spatial heterogeneity in a cool-temperate young larch plantation in northern Japan
Inter-annual variation of soil respiration and its spatial heterogeneity in a cool-temperate young larch plantation in northern Japan
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DOI：
10.2480/agrmet.d-19-00026
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发表时间：
2020
影响因子：
1.3
通讯作者：
Lifei Sun;K. Takagi;Munemasa Teramoto;Shintaro Hayakashi;N. Liang
中科院分区：
文献类型：
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作者：
Lifei Sun;K. Takagi;Munemasa Teramoto;Shintaro Hayakashi;N. Liang
为了解成熟林皆伐后幼林土壤呼吸的时间变化及其空间异质性，以及非生物和生物因子对幼林土壤呼吸变化的影响，分析了8 a的土壤呼吸、小气候、在日本北方，在雪季，2004年至2014年免费。通过多通道自动化室系统测量Rs，并将其分解为两个分量，呼吸的温度敏感性Q10和10°C下的温度标准化基础呼吸R10。体积土壤含水量通过抑制R10影响Rs的季节和年际变化，而土壤温度仅影响其季节变化。植被恢复对RS的时间变化和空间异质性都有显著影响，但乔木和林下灌木莎莎对这些变化的贡献不同。增加林下莎莎派（植物面积指数）恢复皆伐后增加Rs通过增加Q10，而空间异质性Rs增加树派通过增加R10。这些结果表明，尽管RS与Ts的季节变化呈指数关系，但土壤水分和植被对恢复性种植园RS的年际变化及其空间异质性有很强的影响。虽然我们的结果是在季节平均Ts年际变化的有限范围内（< 2°C）获得的，但这可能不是我们研究地点的唯一情况，并在未来更温暖的环境中预测Rs时给予我们警告。
To understand the magnitudes of temporal variation in soil respiration (Rs) and its spatial heterogeneity, and the effect of abiotic and biotic factors to cause the variation in a young plantation recovering after the clear-cutting of a mature forest, we analyzed 8 year Rs, microclimate, and vegetation data obtained in a young hybrid larch plantation with dense undergrowth of dwarf bamboo Sasa in northern Japan during snow-free periods from 2004 to 2014. Rs was measured by a multichannel automated chamber system and was resolved into two components, temperature sensitivity of respiration, Q10, and temperature-normalized basal respiration at 10°C, R10. Volumetric soil water content affects both seasonal and inter-annual variation of Rs by suppressing R10, whereas soil temperature affects only its seasonal variation. Vegetation recovery had significant effect on both temporal variation and spatial heterogeneity in Rs, although the tree and undergrowth Sasa had different contribution to these variations. Increase in the undergrowth Sasa PAI (plant area index) recovering after clear-cutting increased the Rs through the increase in Q10, whereas the spatial heterogeneity in Rs was increased by the increase in the tree PAI through the increase in R10. These results reveal that the soil water and vegetation has strong effect on the inter-annual variation of Rs and its spatial heterogeneity in the recovering young plantation, in spite of the strong exponential relationship of Rs with Ts in their seasonal variation. Although our results were obtained under the limited range in the inter-annual variation in seasonal mean Ts (< 2°C), this may not be the unique case only in our study site and gives us a caution when predicting Rs in future warmer environment.