IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Wang Jian1; Wang Genxu2; Fu Yu1; Chen Xiaopeng2; Song Xiaoyan2
Source Publicationjournalofforestryresearch
AbstractNitrogen (N) deposition to alpine forest ecosystems is increasing gradually, yet previous studies have seldom reported the effects of N inputs on soil CO2 flux in these ecosystems. Evaluating the effects of soil respiration on N addition is of great significance for understanding soil carbon (C) budgets along N gradients in forest ecosystems. In this study, four levels of N (0, 50, 100, 150kgN ha(-1)a(-1)) were added to soil in a Picea baifouriana and an Abies georgei natural forest on the Tibetan Plateau to investigate the effect of the N inputs on soil respiration. N addition stimulated total soil respiration (Rt) and its components including heterotrophic respiration (Rh) and autotrophic respiration (Ra); however, the promoted effects declined with an increase in N application in two coniferous forests. Soil respiration rate was a little greater in the spruce forest (1.05mol CO2 m(-2)s(-1)) than that in the fir forest (0.97mol CO2 m(-2)s(-1)). A repeated measures ANOVA indicated that N fertilization had significant effects on Rt and its components in the spruce forest and Rt in the fir forest, but had no obvious effect on Rh or Ra in the fir forest. Rt and its components had significant exponential relationships with soil temperature in both forests. N addition also increased temperature sensitivity (Q(10)) of Rt and its components in the two coniferous forests, but the promotion declined as N in put increased. Important, soil moisture had great effects on Rt and its components in the spruce forest (P 0.05). Following N fertilization, Ra was significantly and positively related to fine root biomass, while Rh was related to soil enzymatic activities in both forests. The mechanisms underlying the effect of simulated N deposition on soil respiration and its components in this study may help in forecasting C cycling in alpine forests under future levels of reactive N deposition.
Funding Project[Chinese Academy of Sciences Key Research Project for Frontier Science] ; ["Strategic Priority Research Program'' of the Chinese Academy of Sciences]
Document Type期刊论文
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Wang Jian,Wang Genxu,Fu Yu,et al. shorttermeffectsofnitrogendepositiononsoilrespirationcomponentsintwoalpineconiferousforestssoutheasterntibetanplateau[J]. journalofforestryresearch,2019,30(3):1029.
APA Wang Jian,Wang Genxu,Fu Yu,Chen Xiaopeng,&Song Xiaoyan.(2019).shorttermeffectsofnitrogendepositiononsoilrespirationcomponentsintwoalpineconiferousforestssoutheasterntibetanplateau.journalofforestryresearch,30(3),1029.
MLA Wang Jian,et al."shorttermeffectsofnitrogendepositiononsoilrespirationcomponentsintwoalpineconiferousforestssoutheasterntibetanplateau".journalofforestryresearch 30.3(2019):1029.
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