Temperature response of soil respiration in a Chinese pine plantation: hysteresis and seasonal vs. diel Q10.
Temperature response of soil respiration in a Chinese pine plantation: hysteresis and seasonal vs. diel Q10.
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DOI：
10.1371/journal.pone.0057858
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
He G
中科院分区：
文献类型：
--
作者：
Jia X;Zha T;Wu B;Zhang Y;Chen W;Wang X;Yu H;He G
虽然土壤呼吸（Rs）的温度响应已被广泛研究，但仍有一些问题尚未解决，包括Rs-温度关系的滞后性和Rs对温度的长期与短期敏感性的差异。这些问题的进展将有助于减少碳循环建模的不确定性。2011年，采用自动气室系统对北京附近的油松种植园土壤CO2通量进行了监测。10 cm深度的土壤温度（Ts）对Rs有很强的控制作用，年温度敏感性（Q10）和10°C时的基础速率（Rs 10）分别为2.76和1.40 µmol m−2 s−1。R和短期（即，每日）的估计卢比10表现出明显的季节性滞后相对于Ts，与流出在今年下半年大于在本赛季初为给定的温度。滞后可能与微生物种群动态和/或垫料输入的混杂效应有关。因此，所有应用的回归模型都未能对整个年度周期的卢比得出无偏估计。RS和Ts之间的滞后，观察到在昼夜尺度在生长季节的早期和晚期，但不是在夏季。在这些滞后的季节性可能是由于使用一个单一的Ts测量深度，未能代表季节性变化的深度CO2生产。Q10的每日估计值平均为2.04，小于从季节关系中获得的值。此外，Q10随Ts的增加而减少，这可能是全球变暖情景下对气候系统的反馈。在模拟大空间范围内的年度碳预算时，使用固定的通用Q10被认为是足够的。相反，当需要短期精度时，应使用季节性变化的环境控制Q 10。
Although the temperature response of soil respiration (Rs) has been studied extensively, several issues remain unresolved, including hysteresis in the Rs–temperature relationship and differences in the long- vs. short-term Rs sensitivity to temperature. Progress on these issues will contribute to reduced uncertainties in carbon cycle modeling. We monitored soil CO2 efflux with an automated chamber system in a Pinus tabulaeformis plantation near Beijing throughout 2011. Soil temperature at 10-cm depth (Ts) exerted a strong control over Rs, with the annual temperature sensitivity (Q 10) and basal rate at 10°C (Rs 10) being 2.76 and 1.40 µmol m−2 s−1, respectively. Both Rs and short-term (i.e., daily) estimates of Rs 10 showed pronounced seasonal hysteresis with respect to Ts, with the efflux in the second half of the year being larger than that early in the season for a given temperature. The hysteresis may be associated with the confounding effects of microbial population dynamics and/or litter input. As a result, all of the applied regression models failed to yield unbiased estimates of Rs over the entire annual cycle. Lags between Rs and Ts were observed at the diel scale in the early and late growing season, but not in summer. The seasonality in these lags may be due to the use of a single Ts measurement depth, which failed to represent seasonal changes in the depth of CO2 production. Daily estimates of Q 10 averaged 2.04, smaller than the value obtained from the seasonal relationship. In addition, daily Q 10 decreased with increasing Ts, which may contribute feedback to the climate system under global warming scenarios. The use of a fixed, universal Q 10 is considered adequate when modeling annual carbon budgets across large spatial extents. In contrast, a seasonally-varying, environmentally-controlled Q 10 should be used when short-term accuracy is required.
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