The effect of nitrogen addition on soil respiration from a nitrogen-limited forest soil
The effect of nitrogen addition on soil respiration from a nitrogen-limited forest soil
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氮添加对限氮森林土壤呼吸的影响
DOI：
10.1016/j.agrformet.2014.06.010
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发表时间：
2014-10
影响因子：
6.2
通讯作者：
Piao, Shilong
中科院分区：
文献类型：
--
作者：
Zhang, Yuan;Zhang, Yuan;Piao, Shilong;Piao, Shilong
研究了华北地区21年生华北落叶松人工林土壤呼吸（Rs）、异养呼吸（Rh）和根际呼吸（Rr）对施氮的响应。2010年5月，确定了三个水平的氮处理（对照，不添加氮;低氮，20 kg N ha− 1 yr −1;高氮，50 kg N ha− 1 yr −1）。然后在2011年至2013年的生长季节测量Rs、Rh和Rr。低氮处理和高氮处理的Rs分别降低了10.0%和12.5%。Rh和Rr表现出不同的反应，氮添加。在观测期内，氮素添加对生长季Rh的通量没有显著影响，但低氮和高氮处理的Rr分别降低了1.37%和1.31%。在三个生长季中，平均Rs速率从对照区的2.47 ± 0.39 μmol m−2s− 1下降到低氮区的2.22 ± 0.34 μmol m−2s− 1和高氮区的2.16 ± 0.30 μmol m−2s− 1。在低氮和高氮地块中，Rr分别占所观察到的Rs减少量的111%和76%。此外，高氮输入也降低了Rh和Rr的温度系数（Q10）。与对照相比，施氮显著降低了高氮区Rh和Rr的Q10，分别降低了7%和13%。总的来说，我们的研究结果表明，Rs的减少主要是由于根际呼吸在我们的氮限制种植园的减少。随着全球气温的升高，氮沉降不仅通过减少碳损失Rs，而且通过降低Rh和Rr的温度系数，增加森林生态系统的固碳量。
We investigated how soil respiration (Rs), heterotrophic respiration (Rh) and rhizosphere respiration (Rr) respond to nitrogen addition in a 21-yr-old larch (Larix principis-rupprechtii) plantation in North China. Three levels of nitrogen treatments (control, no nitrogen addition; low-N, 20 kg N ha−1yr−1; high-N, 50 kg N ha−1yr−1) were established in May 2010. Rs, Rh and Rr were then measured during the growing seasons from 2011 to 2013. Nitrogen addition significantly reduced Rs by 10.0% under low-N treatment and by 12.5% under high-N treatment. Rh and Rr showed different responses to nitrogen addition. Nitrogen addition had no significant effects on growing season fluxes of Rh during the observation periods, but Rr was decreased by ∼37% and ∼31% under the low-N and high-N treatments, respectively. Averaged across the three growing seasons, the mean rate of Rs decreased from 2.47 ± 0.39 μmol m−2s−1in the control plots to 2.22 ± 0.34 μmol m−2s−1in low-N plot and 2.16 ± 0.30 μmol m−2s−1in the high-N plot. Rr contributed about 111% and 76% of the observed reduction of Rs in low and high-N plots, respectively. In addition, elevated nitrogen input also reduced the temperature coefficients (Q10) of Rh and Rr. Compared to the control, nitrogen additions significantly decreasedQ10of Rh and Rr in high-N plots by 7% and 13%, respectively. Overall, our results suggest that the reduction in Rs can mainly be attributed to the decrease in rhizosphere respiration in our nitrogen-limited plantation. With global temperature rising, nitrogen deposition may increase carbon sequestration in forest ecosystems, not only by reducing carbon loss by Rs, but also by reducing the temperature coefficients of Rh and Rr.
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林龄调节华北落叶松人工林土壤呼吸对温度的响应
影响因子：
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作者：
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