Ecosystem respiration and its components from a Carex meadow of Poyang Lake during the drawdown period
文献类型：SCI/SSCI论文
| 作者 | Hu Q. W.; Wu, Q.; Yao, B.; Xu, X. L. |
| 发表日期 | 2015 |
| 关键词 | Poyang lake Carex meadow Ecosystem respiratory component Temperature sensitivity Carbon sink qinghai-tibetan plateau soil organic-matter carbon-dioxide temperature sensitivity rhizosphere respiration methane emissions littoral-zone co2 efflux microbial contributions northern peatland |
| 英文摘要 | Little is known about the components of ecosystem respiration from a subtropical littoral wetland with dramatic annual inundation dynamics. In this study, we investigated ecosystem respiration and its components in a Poyang lake Carex meadow during the drawdown periods from May 2009 to June 2011. Both ecosystem respiration and its components showed clear temporal variation pattern, with temperature being the dominant control. Ecosystem respiration ranged from 98.01 to 1359.25 mg CO2 m(-2) h(-1). Shoot and root respiration contributed approximately 36% and 26% to the ecosystem respiration, respectively, whereas microbial respiration accounted for 38% of the ecosystem respiration. The ratio of total soil respiration to ecosystem respiration varied from 0.45 to 0.90, depending on growing season stages. Their Q(10) values ranged from 1.72 to 2.51, with the maximum for shoot respiration and the minimum for microbial respiration. In addition, the Q(10) values varied with time and among ecosystem respiratory components and hence could not be treated as a constant. None of the respiration measurements was significantly related to soil moisture, suggesting that soil moisture was not a limiting environmental factor for respiratory activity during the drawdown periods in this meadow. The Carex meadow acted as strong carbon sink during the drawdown periods due to double growing seasons, but the previous summer flood duration could substantially alter carbon sink intensity in the following drawdown period. The total carbon sink of the littoral zone of Poyang Lake during drawdown periods was estimated to be 0.17-0.59 Tg C yr(-1). (C) 2014 Elsevier Ltd. All rights reserved. |
| 出处 | Atmospheric Environment |
| 卷 | 100 |
| 页 | 124-132 |
| 语种 | 英语 |
| ISSN号 | 1352-2310 |
| DOI标识 | 10.1016/j.atmosenv.2014.10.047 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43534]  |
| 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.,Wu, Q.,Yao, B.,et al. Ecosystem respiration and its components from a Carex meadow of Poyang Lake during the drawdown period. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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