Seasonal and diurnal patterns of soil respiration in an evergreen coniferous forest: Evidence from six years of observation with automatic chambers.
Seasonal and diurnal patterns of soil respiration in an evergreen coniferous forest: Evidence from six years of observation with automatic chambers.
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DOI：
10.1371/journal.pone.0192622
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Tani M
中科院分区：
文献类型：
--
作者：
Makita N;Kosugi Y;Sakabe A;Kanazawa A;Ohkubo S;Tani M
土壤呼吸在森林生态系统碳平衡中起着关键作用。越来越多的证据表明，Rs与冠层光合作用密切相关；然而，Rs如何在季节和昼夜尺度上与不同物候期的地上属性相关联仍不清楚。利用自动封闭动态小室系统，研究了2005-2010年温带常绿针叶林中Rs的季节和日变化规律。高频Rs率随季节变化而变化，但表现出较强的滞后性。基于温度响应模型的Rs预测低估了6-7月的观测值，而高估了8-9月和1-4月的观测值。尽管土壤温度相似，但初夏观测到的Rs高于夏末和秋季。在日尺度上，在生物活动较高的季节(6~10月)，Rs模式与土壤温度的变化趋势呈滞后曲线。在7、8月份，虽然土壤温度持续升高，但Rs在早高峰后呈下降趋势，从0800到1400h。在此期间，观察到了8字形的Rs日变化模式，表明根系生理活性的中午下降可能发生在初夏。在9月和10月，尽管土壤温度持续较高，但Rs在上午高于夜间。我们已经描述了常绿森林中季节和昼夜R的大小和模式。我们的结论是，在高分辨率下，Rs的时间变率更多地与温度相关的季节相关。
Soil respiration (Rs) plays a key role in the carbon balance of forest ecosystems. There is growing evidence that Rs is strongly correlated with canopy photosynthesis; however, how Rs is linked to aboveground attributes at various phenological stages, on the seasonal and diurnal scale, remains unclear. Using an automated closed dynamic chamber system, we assessed the seasonal and diurnal patterns of Rs in a temperate evergreen coniferous forest from 2005 to 2010. High-frequency Rs rates followed seasonal soil temperature patterns but the relationship showed strong hysteresis. Predictions of Rs based on a temperature-response model underestimated the observed values from June to July and overestimated those from August to September and from January to April. The observed Rs was higher in early summer than in late summer and autumn despite similar soil temperatures. At a diurnal scale, the Rs pattern showed a hysteresis loop with the soil temperature trend during the seasons of high biological activity (June to October). In July and August, Rs declined after the morning peak from 0800 to 1400 h, although soil temperatures continued to increase. During that period, figure-eight-shaped diurnal Rs patterns were observed, suggesting that a midday decline in root physiological activity may have occurred in early summer. In September and October, Rs was higher in the morning than in the night despite consistently high soil temperatures. We have characterised the magnitude and pattern of seasonal and diurnal Rs in an evergreen forest. We conclude that the temporal variability of Rs at high resolution is more related to seasons across the temperature dependence.
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影响因子：
11.6
作者：
Janssens, IA;Pilegaard, K
通讯作者：
Pilegaard, K
影响因子：
6.2
作者：
Drewitt, GB;Black, TA;Morgenstern, K
通讯作者：
Morgenstern, K
影响因子：
4
作者：
Gaumont-Guay, David;Black, T. Andrew;Nesic, Zoran
通讯作者：
Nesic, Zoran
影响因子：
2.7
作者：
Heskel, Mary A.;Atkin, Owen K.;Griffin, Kevin L.
通讯作者：
Griffin, Kevin L.
DOI：
10.1111/j.1469-8137.2008.02755.x
发表时间：
2009
期刊：
The New phytologist
影响因子：
--
作者：
Bahn M;Schmitt M;Siegwolf R;Richter A;Brüggemann N
通讯作者：
Brüggemann N