GUO Xiaowei,DU Yangong,LI Yikang,et al.Effects of Vegetation Layers on Methane Flux in Alpine Meadow on the Tibetan Plateau[J].Research of Soil and Water Conservation,2015,22(01):146-152.
高寒草甸植被层对于草地甲烷通量的影响
- Title:
- Effects of Vegetation Layers on Methane Flux in Alpine Meadow on the Tibetan Plateau
- Keywords:
- Tibetan Plateau; alpine meadows; methane flux; vegetation layer
- 分类号:
- S812
- 摘要:
- 土壤对大气甲烷的汇是草地的一项重要生态功能，关于草地的温室气体通量已有大量研究，但鲜见关于植被层对于草地甲烷通量影响的报道。通过设置完整高寒草甸（IHC）、去除地上生物量草地（RAB）和裸地（RBB）三个处理，利用静态箱法来研究植被层对于草地甲烷通量的影响，结果显示在观测期间草地的平均甲烷氧化速率由高到低依次为：裸地[（52.2±18.9）μg/（m2·h）] > 去除地上生物量草地[（32.3±14.7）μg/（m2·h）] > 完整草地[（27.9±10.6）μg/（m2·h）]，三者之间差异达到显著水平（P<0.05）。根据三种处理计算出的草地根系和草地地上部分生物量2003—2004年的甲烷通量分别为（23.5±18.3）μg/（m2·h）和（7.4±11.5）μg/（m2·h），二者甲烷通量均为正值说明植物地上部分和草地根系都起到了促进甲烷排放的功能。在2003年、2004年、2005年、2006年RBB生长季平均甲烷通量分别为（-67.7±20.6）μg/（m2·h），（-60.7±18.5）μg/（m2·h），（-58.3±16.3）μg/（m2·h）和（-48.9±22.6）μg/（m2·h），表现为逐年降低的规律，但是IHC处理和RAB处理生长季甲烷平均通量的年季差异不显著，且没有明显的规律。在三年的原位观测期间，三种处理甲烷通量与土壤5 cm温度、土壤湿度相关性也达到显著水平（P<0.05）。
- Abstract:
- Soil methane oxidation is one of the important ecological functions of grassland, there have been many studies about methane flux in alpine meadow, while few of them is about effect of vegetation layer. In this study, we set up three treatments, ie. Nate alpine meadow (IHC), meadow with removal of aboveground biomass (RAB) and bare soil (RBB). Greenhouse gas fluxes were measured by using static chambers and gas chromatography. The result indicate that the vegetation layer had the significantly effect on methane oxidation of grassland, the three treatments showed decreasing CH4 consumption rates in the following order: RBB[ (2.2±18.9) μg/(m2·h)] > RAB[ (32.3±14.7) μg/(m2·h)] > IHC[ (27.9±10.6) μg/(m2·h)] for the three years. Methane oxidation rate of rhizospheric soil and aboveground biomass were (23.5±18.3) μg/(m2·h) and (7.4±11.5) μg/(m2·h) during 2003—2004. The methane flux rate of bare soil decreased year by year, the flux rate were (-67.7±20.6) μg/(m2·h), (-60.7±18.5) μg/(m2·h), (-58.3±16.3) μg/(m2·h) and (-48.9±22.6) μg/(m2·h) in 2003, 2004, 2005 and 2006 growing season, respectively. The methane flux rate had well correlation with soil temperature and soil moisture in 5 cm depth.
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备注/Memo
收稿日期:2014-04-14;改回日期:2014-04-22。
基金项目:国家自然科学基金重点项目（41030105）；中科院西部之光项目“人类活动对高寒草甸氮素转化关键过程的影响机制”；青海省自然科学资助项目（31200379，2012-Z-921Q）
作者简介:郭小伟(1985-),男,山东潍坊人,在读博士,研究方向:植物生态学。E-mail:xwguo1206@163.com
通讯作者:曹广民(1962-),男,陕西渭南人,博士,研究员,主要从事草地生态学研究。E-mail:caogm@nwipb.cas.cn