title: Nitrogen deposition may enhance soil carbon storage via change of soil respiration dynamic during a spring freeze-thaw cycle period.
abstract: As crucial terrestrial ecosystems, temperate forests play an important role in global soil carbon dioxide flux, and this process can be sensitive to atmospheric nitrogen deposition. It is often reported that the nitrogen addition induces a change in soil carbon dioxide emission in growing season. However, the important effects of interactions between nitrogen deposition and the freeze-thaw-cycle have never been investigated. Here we show nitrogen deposition delays spikes of soil respiration and weaken soil respiration. We found the nitrogen addition, time and nitrogen addition×time exerted the negative impact on the soil respiration of spring freeze-thaw periods due to delay of spikes and inhibition of soil respiration (p < 0.001). The values of soil respiration were decreased by 6% (low-nitrogen), 39% (medium-nitrogen) and 36% (high-nitrogen) compared with the control. And the decrease values of soil respiration under medium- and high-nitrogen treatments during spring freeze-thaw-cycle period in temperate forest would be approximately equivalent to 1% of global annual C emissions. Therefore, we show interactions between nitrogen deposition and freeze-thaw-cycle in temperate forest ecosystems are important to predict global carbon emissions and sequestrations. We anticipate our finding to be a starting point for more sophisticated prediction of soil respirations in temperate forests ecosystems.
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.|School of forestry, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
authors.forename: Guoyong
authors.initials: G
authors.lastname: Yan
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.|Institute of forestry science of Heilongjiang province, 134 Haping Road, Harbin 150081, China.
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Xing
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.
authors.forename: Lijian
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of forestry, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
authors.forename: Jianyu
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of forestry, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Meng
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.|School of forestry, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
authors.forename: Qinggui
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China.
authors.forename: Jinghua
authors.initials: J
authors.lastname: Yu
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Wang
authors.affiliation: College of Agricultural Resource and Environment, Heilongjiang University, 74 Xuefu Road, Harbin, 150080, China.
authors.forename: Siling
authors.initials: S
authors.lastname: Jiang
authors.affiliation: School of forestry, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
authors.forename: Boqi
authors.initials: B
authors.lastname: Liu
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China.
authors.forename: Shijie
authors.initials: S
authors.lastname: Han