Soil nitrate accumulation explains the nonlinear responses of soil CO2 and CH4 fluxes to nitrogen addition in a temperate needle-broadleaved mixed forest
文献类型：期刊论文
| 作者 | Geng, J; Cheng, SL; Fang, HJ ; Yu, GR; Li, XY; Si, GY; He, S; Yu, GX
|
| 刊名 | ECOLOGICAL INDICATORS
 |
| 出版日期 | 2017 |
| 卷号 | 79页码:28-36 |
| 关键词 | Atmospheric N deposition Soil CO2 emission Soil CH4 uptake Nonlinear responses Temperate needle-broadleaved mixed forest Changbai mountain |
| ISSN号 | 1470-160X |
| 英文摘要 | The responses of soil-atmosphere carbon (C) exchange fluxes to growing atmospheric nitrogen (N) deposition are controversial, leading to large uncertainty in the estimated C sink of global forest ecosystems experiencing substantial N inputs. However, it is challenging to quantify critical load of N input for the alteration of the soil C fluxes, and what factors controlled the changes in soil CO2 and CH4 fluxes under N enrichment. Nine levels of urea addition experiment (0, 10, 20, 40, 60, 80, 100, 120, 140 kg N ha(-1) yr(-1)) were conducted in the needle-broadleaved mixed forest in Changbai Mountain, Northeast China. Soil CO2 and CH4 fluxes were monitored weekly using the static chamber and gas chromatograph technique. Environmental variables (soil temperature and moisture in the 010 cm depth) and dissolved N (NH4+-N, NO3--N, total dissolved N (TDN), and dissolved organic N (DON)) in the organic layer and the 010 cm mineral soil layer were simultaneously measured. High rates of N addition (>= 60 kg N ha(-1) yr(-1)) significantly increased soil NO3--N contents in the organic layer and the mineral layer by 120%-180% and 56.4%-84.6%, respectively. However, N application did not lead to a significant accumulation of soil NH4+-N contents in the two soil layers except for a few treatments. N addition at a low rate of 10 kg N ha(-1) yr(-1) significantly stimulated, whereas high rate of N addition (140 kg N ha(-1) yr(-1)) significantly inhibited soil CO2 emission and CH4 uptake. Significant negative relationships were observed between changes in soil CO2 emission and CH4 uptake and changes in soil NO3--N and moisture contents under N enrichment. These results suggest that soil nitrification and NO3--N accumulation could be important regulators of soil CO2 emission and CH4 uptake in the temperate needle-broadleaved mixed forest. The nonlinear responses to exogenous N inputs and the critical level of N in terms of soil C fluxes should be considered in the ecological process models and ecosystem management. |
| 学科主题 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000406436000004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/44026]  |
| 专题 | 地理科学与资源研究所_生态系统研究网络观测与模拟重点实验室_CERN水分分中心 |
| 推荐引用方式 GB/T 7714 | Geng, J,Cheng, SL,Fang, HJ,et al. Soil nitrate accumulation explains the nonlinear responses of soil CO2 and CH4 fluxes to nitrogen addition in a temperate needle-broadleaved mixed forest[J]. ECOLOGICAL INDICATORS,2017,79:28-36. |
| APA | Geng, J.,Cheng, SL.,Fang, HJ.,Yu, GR.,Li, XY.,...&Yu, GX.(2017).Soil nitrate accumulation explains the nonlinear responses of soil CO2 and CH4 fluxes to nitrogen addition in a temperate needle-broadleaved mixed forest.ECOLOGICAL INDICATORS,79,28-36. |
| MLA | Geng, J,et al."Soil nitrate accumulation explains the nonlinear responses of soil CO2 and CH4 fluxes to nitrogen addition in a temperate needle-broadleaved mixed forest".ECOLOGICAL INDICATORS 79(2017):28-36. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。