青藏高原高寒湿地CO2通量特征及影响因子分析

doi:10.7522/j.issn.1000-0240.2017.0007

摘要/Abstract

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

张海宏, 李林, 周秉荣, 肖宏斌. 青藏高原高寒湿地CO₂通量特征及影响因子分析[J]. 冰川冻土, 2017, 39(1): 54-60.

ZHANG Haihong, LI Lin, ZHOU Bingrong, XIAO Hongbin. Characteristics of CO₂ flux over the alpine wetland in the Tibetan Plateau and its control factors[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2017, 39(1): 54-60.

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青藏高原高寒湿地CO₂通量特征及影响因子分析

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

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