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干旱年份三江平原沼泽甲烷(CH4)排放及影响因子

杨文燕1,2;宋长春1;栾兆擎1;张金波1,2   

  1. 1中国科学院东北地理与农业生态研究所, 长春 130012;2中国科学院研究生院, 北京 100039
  • 收稿日期:2005-03-30 修回日期:2005-05-30 出版日期:2006-04-10 发布日期:2006-04-10

Methane emission from freshwater marshes in Sanjiang Plain and its affecting factors in arid year

YANG Wenyan1,2;SONG Changchun1;LUAN Zhaoqing1;ZHANG Jinbo1,2   

  1. 1Northeast Institute Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun 130012, China;2Graduate University of Chinese Academy of Sciences,Beijing 100039, China

  • Received:2005-03-30 Revised:2005-05-30 Online:2006-04-10 Published:2006-04-10

摘要: 为了研究淡水沼泽CH4排放的影响因子及其机制,在中国东北部的三江平原样地观测了CH4排放通量以及部分影响因子。结果表明,在2003年4~10月生长季内,毛果苔草沼泽CH4通量平均值为3.30 mg·m-2·h-1(最小值为0.65 mg·m-2·h-1,最大值为13.47 mg·m-2·h-1),低于小叶章沼泽化草甸CH4通量平均值4.91 mg·m-2·h-1(最小值为-0.12 mg·m-2·h-1,最大值为16.25 mg·m-2·h-1)。在不同阶段,两种类型沼泽CH4通量有明显的变化,控制因子也不一样。4月份低温限制了CH4通量,两种类型沼泽差异很小。5~7月下旬,小叶章沼泽化草甸CH4通量显著高于毛果苔草沼泽CH4通量(P<0.01),这种差异是由融冻作用造成的。8月份,植株密度和剖面中活性有机碳的浓度成为主要的影响因子,毛果苔草沼泽CH4通量比小叶章沼泽化草甸高。

关键词: 电气石, 海水, pH, 盐度

Abstract: To understand the mechanism and affecting factors of CH4 emission from freshwater marshes,we studied in situ the CH4 emission in Sanjiang Plain of Northeast China,and its possible affecting factors.The results showed that from April to October 2003,the average CH4 flux (3.30 mg·m-2·h-1) from Carex lasiocarpa marsh was lower than that (4.91 mg·m-2·h-1) from Deyeucia angustifolia marsh,but the difference was not significant.There were obvious changes in CH4 flux from these marshes at different stages,and the controlling factor was not the same.In April,lower temperature limited CH4 flux,but no significant difference was observed between the two marshes.From May to July,CH4 flux from D.angustfolia marsh was significantly higher than that from C.lasiocarpa marsh (P<0.01),which mainly resulted from thawing-freezing action.In August,stem density and active organic carbon concentration in profiles became controlling factors,and the CH4 flux from C.lasiocarpa marsh was higher than that from D.angustifolia marsh.

Key words: Tourmaline, Seawater, pH value, Salinity