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Short Legacy Effects of Growing Season Nitrogen Addition and Reduced Precipitation alter Soil Respiration during Nongrowing Season

by Guoyong Yan 1,2,3, Yajuan Xing 2,3, Qinggui Wang 1,2,3,*,† and Changcheng Mu 1,*,†
1
School of Forestry, Northeast Forestry University, Harbin 150040, China
2
College of Life Science, Qufu Normal Univesity, Qufu 273165, China
3
College of Agricultural Resource and Environment, Heilongjiang University, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
These two authors contribute equally to this work.
Forests 2020, 11(3), 358; https://doi.org/10.3390/f11030358
Received: 6 February 2020 / Revised: 18 March 2020 / Accepted: 22 March 2020 / Published: 23 March 2020
(This article belongs to the Section Forest Ecology and Management)
The short legacy effects of growing season nitrogen (N) addition and reduced precipitation on nongrowing season soil respiration (Rs), autotrophic respiration (Ra), and heterotrophic respiration (Rh) are still unclear. Therefore, a field manipulative experiment to determine the responses of nongrowing season Rs and its components to growing season N addition and reduced precipitation was conducted in a temperate forest. The results show that growing season N addition and reduced precipitation significantly increased nongrowing season Rs by regulating the response of Ra and Rh. The combination of N addition and reduced precipitation also showed a much stronger effect on Rs and its components, but the magnitude and direction largely depended on the snowpack thickness. The effects of growing season N addition and reduced precipitation on nongrowing season Rs and its components were mediated by different sampling periods. N addition significantly decreased Rs by decreasing Rh in early winter and significantly increased Rs by increasing Ra in deep winter and late winter. All treatments decreased temperature sensitivity (Q10) of Rs and Rh. Our findings contribute to a better understanding of how nongrowing season Rs and its components will change under growing season N addition and reduced precipitation and could improve predictions of the future states of the soil C cycle in response to climate change. View Full-Text
Keywords: N addition; reduced precipitation; nongrowing season soil respiration; carbon cycle N addition; reduced precipitation; nongrowing season soil respiration; carbon cycle
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Yan, G.; Xing, Y.; Wang, Q.; Mu, C. Short Legacy Effects of Growing Season Nitrogen Addition and Reduced Precipitation alter Soil Respiration during Nongrowing Season. Forests 2020, 11, 358.

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