Nonlinear responses of soil nitrous oxide emission to multi-level nitrogen enrichment in a temperate needle-broadleaved mixed forest in Northeast China
文献类型：SCI/SSCI论文
| 作者 | Cheng S. L.; Wang, L.; Fang, H. J.; Yu, G. R.; Yang, X. M.; Li, X. Y.; Si, G. Y.; Geng, J.; He, S.; Yu, G. X. |
| 发表日期 | 2016 |
| 关键词 | Atmospheric N deposition Soil N2O flux Soil dissolved N Nonlinear responses Temperate needle-broadleaved mixed forest fertilizer nitrogen terrestrial ecosystems cropping system n2o emission deposition carbon fluxes metaanalysis input cycle |
| 英文摘要 | The responses of nitrous oxide (N2O) emission from forest soils to increasing atmospheric nitrogen (N) deposition are controversial. In this study, our objectives were to explore the response curves of soil N2O flux to multilevel N inputs, as well as to examine the key factors dominating the changes in soil N2O emission caused by N enrichment in the temperate needle-broadleaved mixed forest, Northeast China. The study consists of nine levels of urea addition (0,10, 20, 40, 60, 80, 100, 120, 140 kg N ha(-1) yr(-1)) with 4 replicates for each treatment. Soil N2O fluxes were monitored weekly using the static chamber and gas chromatograph technique. NH4+-NO3-,-N, total dissolved N (TDN), dissolved organic N (DON), and auxiliary variables (soil temperate and moisture in 0-10 cm depth) were measured at the same frequency to examine the regulation of soil N2O flux. The results showed that high rates of urea inputs (>60 kg N ha(-1) yr(-1)) significantly increased soil NO3--N concentrations in litter layer and mineral layer (0-10 cm depth) by 120-180% and 56.4-84.6%, respectively. Soil N2O flux increased exponentially with increase in the rates of urea addition by 194% to 334% for the 60 to 140 kg N ha(-1) yr(-1) treatments relative to the control. The critical level of N input for the significant alternation of soil N accumulation and N2O emission was approximately 70 kg N ha(-1) yr(-1). The changes in soil N2O flux elicited by. N addition were positively related to those of soil NOT and soil moisture contents. These results suggest that exogenous N input at the rate below the critical load will not significantly promote soil N2O emission over the short term, which is favorable to carbon sequestration of the temperate needle-broadleaved mixed forest, Northeast China. (C) 2016 Elsevier B.V. All rights reserved. |
| 出处 | Catena |
| 卷 | 147 |
| 页 | 556-563 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0341-8162 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43409]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Cheng S. L.,Wang, L.,Fang, H. J.,et al. Nonlinear responses of soil nitrous oxide emission to multi-level nitrogen enrichment in a temperate needle-broadleaved mixed forest in Northeast China. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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