Diurnal and seasonal change in stem respiration of Larix principis-rupprechtii trees, northern China.
Diurnal and seasonal change in stem respiration of Larix principis-rupprechtii trees, northern China.
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中国北方华北落叶松树茎呼吸的日变化和季节变化
DOI：
10.1371/journal.pone.0089294
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Piao S
中科院分区：
文献类型：
--
作者：
Yang Y;Zhao M;Xu X;Sun Z;Yin G;Piao S
树干呼吸是生态系统碳循环的重要组成部分，也是一个不确定因素.很少有研究报道树干呼吸的日变化及其与气候的联系。本研究调查了2010年至2012年中国北方落叶松人工林树干呼吸的昼夜和季节变化及其与环境因子的关系。树干单位表面积呼吸（RS）具有明显的日变化，变化范围为1.65±0.10 ~ 2.69±0.15 μmol m−2 s−1，6∶00后上升，15∶00达到峰值，然后下降。茎温和气温的日变化规律相似，而空气相对湿度的日变化规律与Rs相反。RS的季节变化与茎温的日变化规律相似。RS从茎温相对较低的5月（1.28±0.07 μmol m−2 s−1）开始增加，在茎温也最高的7月（3.02±0.10 μmol m− 2 s −1）达到峰值。进一步的回归分析表明，RS随温度的升高呈指数增加，白天中午RS的Q10（12∶00为1.97±0.17，15∶00为1.96±0.10）显著低于夜间Q10（00∶00为2.60±0.14，03∶00为2.71±0.25）。这一结果不仅意味着Rs对夜间比白天变暖更敏感，而且还强调了仅通过白天测量估计的Rs的温度响应可能导致低估全球变暖下的树干呼吸增加，特别是考虑到夜间温度增加更快。
Stem respiration is a critical and uncertain component of ecosystem carbon cycle. Few studies reported diurnal change in stem respiration as well as its linkage with climate. In this study, we investigated the diurnal and seasonal change in stem respiration and its linkage with environmental factors, in larch plantations of northern China from 2010 to 2012. The stem respiration per unit surface area (RS) showed clear diurnal cycles, ranging from 1.65±0.10 to 2.69±0.15 µmol m−2 s−1, increased after 6∶00, peaked at 15∶00 and then decreased. Both stem temperature and air temperature show similar diurnal pattern, while the diurnal pattern of air relative humidity is just the opposite to Rs. Similar to the diurnal cycles, seasonal change in RS followed the pattern of stem temperature. RS increased from May (1.28±0.07 µmol m−2 s−1) when the stem temperature was relatively low and peaked in July (3.02±0.10 µmol m−2 s−1) when the stem temperature was also the highest. Further regression analyses show that RS exponentially increases with increasing temperature, and the Q10 of Rs at mid daytime (1.97±0.17 at 12∶00 and 1.96±0.10 at 15∶00) is significantly lower than that of mid nighttime (2.60±0.14 at 00∶00 and 2.71±0.25 at 03∶00) Q10. This result not only implies that Rs is more sensitive to night than day warming, but also highlights that temperature responses of Rs estimated by only daytime measurement can lead to underestimated stem respiration increase under global warming, especially considering that temperature increase is faster during nighttime.
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