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冰川冻土 ›› 2017, Vol. 39 ›› Issue (1): 54-60.doi: 10.7522/j.issn.1000-0240.2017.0007

• 冰冻圈与全球变化 • 上一篇    下一篇

青藏高原高寒湿地CO2通量特征及影响因子分析

张海宏, 李林, 周秉荣, 肖宏斌   

  1. 青海省气象科学研究所, 青海 西宁 810001
  • 收稿日期:2016-09-10 修回日期:2016-12-12 出版日期:2017-02-25 发布日期:2017-06-03
  • 作者简介:张海宏(1984-),男,青海西宁人,助理级工程师,2011年在北京大学获硕士学位,从事青藏高原地区陆面过程与气候变化影响研究.E-mail:pkuzhh@163.com.
  • 基金资助:
    国家自然科学基金(41065007);公益性行业(气象)科研专项(GYHY(QX)201506001)资助

Characteristics of CO2 flux over the alpine wetland in the Tibetan Plateau and its control factors

ZHANG Haihong, LI Lin, ZHOU Bingrong, XIAO Hongbin   

  1. Qinghai Institute of Meteorological Science, Xining 810001, China
  • Received:2016-09-10 Revised:2016-12-12 Online:2017-02-25 Published:2017-06-03

摘要: 利用玉树隆宝湿地2015年的涡动相关系统观测资料,分析了高寒湿地CO2通量的变化特征及影响因子。结果表明:玉树隆宝湿地生长季CO2通量日变化呈倒单峰型,夏季日变化幅度大,冬季日变化幅度小。4-9月CO2净交换量为负值,其余各月CO2净交换量为正值。全年CO2净吸收量为465 g·m-2。白天CO2通量随着光合有效辐射的增大而减小。CO2排放量与土壤温度和气温日较差均呈正相关。高寒湿地土壤体积含水量对CO2通量的影响很微弱。降雨事件发生后, CO2排放量在短期内有所升高。各影响因子中,光合有效辐射对高寒湿地CO2通量影响的相关度最高,其次为气温日较差,土壤温度,而土壤体积含水量对CO2通量影响的相关度最低。

关键词: 高寒湿地, CO2通量, 碳交换, 陆面过程

Abstract: Using the data observed by eddy-covariance flux in Longbao wetland, Yushu, in 2015, characteristics of CO2 flux and its control factors were analyzed. The results show that daily change of CO2 flux in Longbao wetland was inverted unimodal and was negative in daylight and positive at night. Daily range of CO2 flux was maximum in July and minimum in January. From April to September there was a carbon sink in the alpine wetland ecosystem and a carbon source in other months. Annual CO2 net absorption was 465 g·m-2. CO2 flux decreased with photosynthetically active radiation increase in daylight. CO2 emission was positively correlated with soil temperature and daily rangeability of air temperature. Alpine wetland soil moisture effected on CO2 flux very weak. CO2 emission increased in short order after rain event. CO2 flux strongly correlated with photosynthetically active radiation, following by daily rangeability of air temperature and soil temperature. CO2 flux weakly correlated with soil moisture.

Key words: alpine wetland, CO2 flux, carbon exchange, land surface process

中图分类号: 

  • P404