Will nitrogen deposition mitigate warming-increased soil respiration in a young subtropical plantation?

Will nitrogen deposition mitigate warming-increased soil respiration in a young subtropical plantation?
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氮沉降会减轻亚热带年轻人工林中因变暖而增加的土壤呼吸吗?

DOI:
10.1016/j.agrformet.2017.06.010
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发表时间:
2017-11
影响因子:
6.2
通讯作者:
Yusheng Yang
Yusheng Yang
中科院分区:
农林科学1区
文献类型:
--
作者:
Xiaofei Liu;Zhijie Yang;Chengfang Lin;Christian P. Giardina;Decheng Xiong;Weisheng Lin;Shidong Chen;Chao Xu;Guangshui Chen;Jinsheng Xie;Yiqing Li;Yusheng Yang

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气候变暖和氮沉降等全球变化可能会改变陆地碳循环,包括土壤呼吸(Rs),这是从土壤到大气的最大CO2来源。为了研究变暖、氮添加及其相互作用对Rs的影响,我们在中国亚热带地区进行了一个双向因子土壤变暖(对照,5 °C变暖)和氮添加(对照,40和80 kg N ha−1yr−1)的围隔实验。我们测量了Rs和养分有效性。我们发现,单独升温增加Rs的15%,但升温加上高氮添加处理似乎有抵消作用,因为这些地块与未加热和未施肥的对照没有显着差异。单独升温增加土壤有效磷(P),但有效性下降,在响应升温加N添加。在这项研究中,单独添加N对Rs没有影响。我们的研究结果表明,未来增加氮沉降可以缓解变暖增加的Rs在磷有限和相对N饱和的亚热带森林生态系统。
Global change such as climate warming and nitrogen (N) deposition is likely to alter terrestrial carbon (C) cycling, including soil respiration (Rs), the largest CO2source from soils to the atmosphere. To examine the effects of warming, N addition and their interactions on Rs, we conducted a two-way factorial soil warming (control, 5 °C warming) and N addition (control, 40 and 80 kg N ha−1yr−1) mesocosm experiment in subtropical China. We measured Rs and nutrient availability. We found warming alone increased Rs by 15%, but warming plus high N addition treatment appeared to have offsetting effects as these plots were not significantly different from unheated and unfertilized controls. Warming alone increased soil available phosphorus (P) but availability declined in response to warming plus N additions. N additions alone had no effect on Rs in this study. Our results suggest that future increases in N deposition could mitigate warming-increased Rs in P-limited and relatively N-saturated subtropical forest ecosystems.
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