地球科学进展 ›› 2002, Vol. 17 ›› Issue (6): 877 -880. doi: 10.11867/j.issn.1001-8166.2002.06.0877

全球变化研究 上一篇    下一篇

若尔盖高原沼泽湿地CH 4排放研究
王德宣 1,吕宪国 1,丁维新 2,蔡祖聪 2,高景福 3,杨福明 3   
  1. 1.中国科学院东北地理与农业生态研究所,吉林 长春 130012;2.中国科学院南京土壤研究所,江苏 南京 210008; 3.四川省草原研究所,四川 红原 624400
  • 收稿日期:2002-03-04 修回日期:2002-06-12 出版日期:2002-12-20
  • 通讯作者: 王德宣(1954-),男,辽宁省沈阳市人,副研究员,主要从事大气环境科学研究.E-mail: wangdexuan@mail.ccig.ac.cn E-mail:wangdexuan@mail.ccig.ac.cn
  • 基金资助:

    中国科学院知识创新工程重要方向项目“中国典型湿地水陆相互作用过程、资源环境效应及调控” (编号:KZCX2-302);中国科学院知识创新工程重大项目“中国陆地和近海生态系统碳收支研究”(编号:KACX1-SW-01)资助.

METHANE EMISSION FROM MARSHES IN ZOIGE PLATEAU

WANG De-xuan 1,LU Xian-guo 1,DING Wei-xin 2,CAI Zu-cong 2, GAO Jing-fu 3, YANG Fu-ming 3   

  1. 1.Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012,China; 2. Nanjing Institute of Soil, CAS, Nanjing 210008, China;3. Sichuan Institute of Grassland, Hongyuan 624400, China
  • Received:2002-03-04 Revised:2002-06-12 Online:2002-12-20 Published:2002-12-01

若尔盖高原沼泽湿地海拔 3400 m,面积 4038km2,是我国面积最大的高原沼泽湿地分布区。2001年 5~9月的非冰冻期,其主要沼泽类型木里苔草沼泽的CH4排放通量范围是 0.51~ 8.20 m g/(m 2· h),平均值为 2.87 m g/(m 2· h);乌拉苔草沼泽CH4排放通量范围是 0.36~10.04 m g/(m 2· h),平均值为 4.51 m g/(m 2· h)。在空间分布上,不同沼泽类型之间CH4排放通量具有一定的差异。在季节变化上,没有明显的排放高峰。根据代表性观测点的CH4平均排放量、日数和沼泽总面积推算,非冰冻期若尔盖高原沼泽湿地CH4的排放量为 0.052Tg/a。

Now the global climate change is the grandest environmental problem in the world. Methane as an important green house gas, its concentration in the global troposphere is increasing. Based on IPCC, atmospheric concentration of methane has increased to 1.745 ppm in 1998. Marsh is a major source of methane emission. China is one of the countries in which there are more marshes. In addition, of all the countries with marshes in the world, only China has plateau marsh, so studying methane emission from China’s plateau marsh is of great importance to estimating the global gross of methane emission. With an area of about 4 038 km2, Zoige plateau is the largest  plateau marsh in China. The carex muliejsis marsh and the carex Meyeriana marsh are the typical marshes in the area. Methane emission flux from the two typical marshes was first monitored twice a week from May to September in 2001. Methane flux measurements were made with the use of a closed-chamber. Methane concentration was determined using a gas chromatograph called Shimadzu GC-12A made in Japan and equipped with a flame ionization detector and a 2-m Poropak Q (80/100 mesh) column. Methane emission flux from the the carex Muliejsis marsh was 0.51~8.20 mg/(m2·h), with an average of 2.87 mg/(m2·h), and from the carex meyeriana marsh was 0.36~10.04 mg/(m2·h), with an average of 4.51 mg/(m2·h). As Zoige plateau with a special climate, a 3~5℃ low temperature even occurred in July and August, which causes no more methane to be emitted from the marshes in the two months than in the other months of the year and there was not obvious high value of CH4 emission in the period of monitoring. According to the CH4 average emission quantity, count of days and area of the marshes, the CH4 emission quantity is about 0.052 Tg/a in Zoige marshes.  

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