中国地理科学(英文版) ›› 2003, Vol. 13 ›› Issue (3): 228-231.

• 论文 • 上一篇    下一篇

CARBON DYNAMICS OF WETLAND IN THE SANJIANG PLAIN

SONG Chang-chun1,2, WANG Yi-yong1, WANG Yue-si2, YAN Bai-xing WANG De-xuan1, ZHAO Zhi-chun1, LOU Yan-jing1   

  1. 1. Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, P. R. China;
    2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, P. R. China
  • 收稿日期:2002-12-23 出版日期:2003-09-20 发布日期:2011-12-15
  • 作者简介:SONG Chang-chun(1968- ), male, a native of Zhumadian City of Henan Province, professor, Ph. D., specialized in greenhouse gases research. E-mail:songcc@mail.neigae.ac.cn
  • 基金资助:

    Under the auspices of the Knowledge Innovation Project of Chinese Academy of Sciences(No.KZCXI-SW-01.KZCX13-SW-262)

CARBON DYNAMICS OF WETLAND IN THE SANJIANG PLAIN

SONG Chang-chun1,2, WANG Yi-yong1, WANG Yue-si2, YAN Bai-xing WANG De-xuan1, ZHAO Zhi-chun1, LOU Yan-jing1   

  1. 1. Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, P. R. China;
    2. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, P. R. China
  • Received:2002-12-23 Online:2003-09-20 Published:2011-12-15

摘要:

Methane(CH4) and carbon dioxide(CO2) emission was measured from mires in the Sanjiang Plain, Northeast China, by using a static chamber technique during free snow-covered periods. The seasonal mean emission of CH4 was 12.4mg/(m2·h) and the emission range of CO2 was 8.7-16.6g/(m2·d)(gross CO2 flux) during plant growth period. CO2 emission rate in the day was stronger than that at night, and the daily peak appears at 19:00. The mire plants in the Sanjiang Plain begin to sprout at the end of April. The aboveground biomass of the mire plants increased from zero to the peak from July to September and showed single peak form. The aboveground biomass of Carex lasiocarpa(464.8g/m2) was lower than that of Deyeuxia platyphylla(530.8g/m2), but the underground biomass was higher than that of Deyeuxia platyphylla. Gross CO2 flux showed the significance positive correlation relationship with plant biomass. Gross CO2 flux and CH4 emission were also correlated with soil temperature(0-5cm) and water temperature. However, the highest CH4 emission rate lagged behind the highest soil temperature in the root area during plant growth period. The data also indicated that wet and warm conditions during the early spring led to greater value of CH4 emission flux. Inundation is the necessary condition for the existence of methane bacteria, but there is no significant positive correlation between the inundation depth and CH4 emission rate in this region. Within the same growing season and under the same inundation condition, the variations of CH4 emission rate could be markedly different.

关键词: mire, methane emission, gross carbon dioxide, static chamber technique, soil temperature

Abstract:

Methane(CH4) and carbon dioxide(CO2) emission was measured from mires in the Sanjiang Plain, Northeast China, by using a static chamber technique during free snow-covered periods. The seasonal mean emission of CH4 was 12.4mg/(m2·h) and the emission range of CO2 was 8.7-16.6g/(m2·d)(gross CO2 flux) during plant growth period. CO2 emission rate in the day was stronger than that at night, and the daily peak appears at 19:00. The mire plants in the Sanjiang Plain begin to sprout at the end of April. The aboveground biomass of the mire plants increased from zero to the peak from July to September and showed single peak form. The aboveground biomass of Carex lasiocarpa(464.8g/m2) was lower than that of Deyeuxia platyphylla(530.8g/m2), but the underground biomass was higher than that of Deyeuxia platyphylla. Gross CO2 flux showed the significance positive correlation relationship with plant biomass. Gross CO2 flux and CH4 emission were also correlated with soil temperature(0-5cm) and water temperature. However, the highest CH4 emission rate lagged behind the highest soil temperature in the root area during plant growth period. The data also indicated that wet and warm conditions during the early spring led to greater value of CH4 emission flux. Inundation is the necessary condition for the existence of methane bacteria, but there is no significant positive correlation between the inundation depth and CH4 emission rate in this region. Within the same growing season and under the same inundation condition, the variations of CH4 emission rate could be markedly different.

Key words: mire, methane emission, gross carbon dioxide, static chamber technique, soil temperature

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