Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods
文献类型：SCI/SSCI论文
| 作者 | Hu Q. W.; Cai, J. Y.; Yao, B.; Wu, Q.; Wang, Y. Q.; Xu, X. L. |
| 发表日期 | 2016 |
| 关键词 | Poyang Lake Carex meadow CH4 N2O Subtropical greenhouse-gas production littoral-zone terrestrial ecosystems constructed wetlands emergent macrophytes soil respiration root respiration eutrophic lake n2o emissions co2 efflux |
| 英文摘要 | Plants have been suggested to have significant effects on methane (CH4) and nitrous oxide (N2O) fluxes from littoral wetlands, but it remains unclear in subtropical lakes. We conducted in situ measurement of CH4 and N2O fluxes for two years. To distinguish between the effects of shoots and roots, three treatments (i.e., intact plants as control, shoot clipping, and root exclusion) were used. Effects of plant biomass, temperature, and soil moisture on CH4 and N2O fluxes were analyzed. The mean ecosystem CH4 emission rate was 36 mu g CH4 m(-2) h(-1) for drying periods, but 8219 mu g CH4 m(-2) h(-1) for drying-wetting transition periods. CH4 fluxes were positively correlated with below-ground and total biomass, but not with above-ground biomass. Clipping did not significantly alter CH4 flux rate, but root exclusion decreased the CH4 flux by 116 % as compared to the control. N2O emissions were similar for both the drying and drying-wetting transition periods, with a mean rate of 20 mu g N2O m(-2) h(-1). Both clipping and root exclusion significantly increased N2O fluxes as compared to the control. There was no significant correlation between CH4 and N2O fluxes. Roots dominated plant-mediated enhancement in CH4 fluxes, but played almost an equal role as shoots in plant-regulated suppression on N2O fluxes in this Carex meadow during drawdown periods. |
| 出处 | Plant and Soil |
| 卷 | 400 |
| 期 | 1-2 |
| 页 | 367-380 |
| 语种 | 英语 |
| ISSN号 | 0032-079X |
| DOI标识 | 10.1007/s11104-015-2733-9 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/42984]  |
| 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 | Hu Q. W.,Cai, J. Y.,Yao, B.,et al. Plant-mediated methane and nitrous oxide fluxes from a carex meadow in Poyang Lake during drawdown periods. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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