若尔盖高原湿地甲烷排放的时空异质性

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 成都山地所知识仓储（2009年以前）

	若尔盖高原湿地甲烷排放的时空异质性
	陈槐 1,2; 高永恒3 ; 姚守平 1; 吴宁 1; 王艳芬 4; 罗鹏 1; 田建卿 5
刊名	生态学报
	2008
卷号	28 期号:7 页码:3425-3437
关键词	青藏高原温室气体通量景观时间动态空间动态地表水位植物高度
ISSN号	1000-0933
其他题名	Spatiotemporal variation of methane emissions from alpine wetlands in Zoige Plateau
通讯作者	吴宁
中文摘要	集中于北美落基山高山湿地甲烷排放的零星报道远不能解析全球高山湿地甲烷源强。因此,世界范围内其他区域高山湿地甲烷排放的研究对于合理估计全球高山湿地甲烷源强,意义重大。采用静态箱-气相色谱法,基于3种典型湿地类型的甲烷排放数据,认为若尔盖高原湿地生长季甲烷的平均排放量为4.69mgCH4m^-2h-1。同时根据2a数据,初步分析了甲烷通量及其对环境因素和生物因素的响应特征,结果表明：（1）甲烷排放昼夜变化具有双峰模式（主峰出现在15：00,次峰出现在06：00）,可由土壤温度以及植物气孔开启来解释。（2）若尔盖湿地甲烷排放季节动态较为典型,即在7月份或8月份出现排放高峰,冬季甲烷排放较少。生长季,对3类群落类型,表面温度与甲烷排放显著相关（r2=0.55,P〈0.05,n=30）,地表水位和植物群落高度与甲烷排放相关性更为显著（r2=0.32,0.61,P〈0.01,n=30）。分析认为该季节节律是由温度以及植物生长状况直接影响的,而水位则是使该节律发生波动的原因（高原气候）。（3）群落尺度下,物候学上相当重要的两个时期,甲烷排放通量均有较高的空间变异（植物生长高峰变异系数为38%,积雪融化高峰为61%）。通过逐步回归线性分析,发现植物生长高峰期,地表水位和群落高度是影响甲烷排放空间差异的主要因素（r2=0.43,0.59,P〈0.01,n=30）。（4）景观尺度下,生长季,景观尺度下甲烷排放有较大的空间变异,湖滨湿地甲烷平排放量最高为11.95mgCH4m^-2h-1,其次为宽谷湿地,其排放量为2.12mgCH4m^-2h-1,河岸湿地表现为甲烷吸收,其吸收量为0.007mgCH4m^-2h-1。地表水位、植物地上生物量以及植物高度能够很好地解释甲烷排放的景观差异。
英文摘要	Zoige Plateau（av.3400 m a.s.l.）,located in the eastern edge of Qinghai-Tibetan Plateau（av.4000 m a.s.l.）,is a complete and orbicular plateau surrounded by a series of alpine mountains（av.4000 m a.s.l.）,covering an area of 2.8×104 km2.Due to the unique alpine climate of the plateau,characterized by cold-long winters alternating with cool- short summers with relatively high precipitation,these alpine wetlands undergo a continuous methane emission through the frozen soil,and then an impulse of methane emission during and immediately following the soil thawing.It was found that methane emission was well coupled with the growing rhythm of plants.However,the magnitude,temporal,and spatial patterns of methane fluxes in alpine wetlands on Zoige Plateau are still highly uncertain.To refine the actual global methane budget of alpine wetlands,methane fluxes were measured among three wetland landscapes at the Zoige National Wetland Reserve.Based on such measurements,it was roughly estimated that mean methane flux from Zoige Plateau was 4.69 mg CH4 m-2 h-1 in the growing season.A special diurnal variation pattern of methane emission was observed that there was two emission peaks：one minor peak occurred at 06：00 and the major one at 15：00.In this study,soil temperature of 5cm depth was considered as the key factor to explain the higher peak at 15：00.After clipping,the methane flux from the Eleocharis valleculosa and Carex muliensis sites were dropped substantially by 47.1% and 63.2%,respectively.The stomata whose opening and closure were under the control of light（PAR）should be major vents for methane efflux.Therefore,one hour after sunrise,the stomata opened substantially and methane efflux reached a small climax at 06：00 because a lot of methane accumulated at night.There were clearly seasonal patterns of methane flux in different environmental types during the growing and non-growing seasons.In the growing season,the main maximum values of methane flux were found in July and August,except for a pea
学科主题	Q14
收录类别	CSCD ; 北大中文核心
语种	中文
CSCD记录号	CSCD:3351782
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/8931]
专题	成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前）成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
作者单位	1.中国科学院成都生物研究所,成都610041 2.重庆大学资源与环境科学学院,重庆400030 3.中国科学院成都山地灾害与环境研究所,成都610041; 4.中国科学院研究生院资源与环境学院,北京100049; 5.中国科学院生命科学院,北京100049
推荐引用方式 GB/T 7714	陈槐,高永恒,姚守平,等. 若尔盖高原湿地甲烷排放的时空异质性[J]. 生态学报,2008,28(7):3425-3437.
APA	陈槐.,高永恒.,姚守平.,吴宁.,王艳芬.,...&田建卿.(2008).若尔盖高原湿地甲烷排放的时空异质性.生态学报,28(7),3425-3437.
MLA	陈槐,et al."若尔盖高原湿地甲烷排放的时空异质性".生态学报 28.7(2008):3425-3437.