生态与农村环境学报2018，Vol.34Issue(2)：124-131,8.DOI:10.11934/j.issn.1673-4831.2018.02.004
青海湖高寒藏嵩草湿草甸湿地生态系统CO2通量变化特征
Variation of CO2Flux of Alpine Wetland Ecosystem of Kobresia tibetica Wet Meadow in Lake Qinghai
摘要
Abstract
Based on the eddy covariance system,variation of CO2flux of the alpine wetland ecosystem of Kobresia tibetica wet meadow in Lake Qinghai was characterized and its affecting factors analyzed. Results show that CO2flux in the ecosys-tem exhibits obvious characteristics of diurnal variation and monthly variation. During the vegetation growing season, net absorption of CO2was observed, with absorption peaks appearing between 12:30 and 15:00 daily, and the highest one reaching up to 0.42 mg·m-2·s-1,while net emission peaks appeared between 20:00 and 22:30, with the highest one being 0.24 mg·m-2·s-1. During the non-growing season,CO2flux varied slightly and was dominated with net emissions. In all the months of the non-growing season,except for November,CO2emissions were obviously higher in the day than in the night. The annual net ecosystem CO2exchange rate of 2015 was 54.55 g·m-2in the wet meadow wetland ecosystem, which obviously behaved as a carbon source.CO2emission path analysis shows that soil temperature,photosynthetically ac-tive radiation and saturated vapor pressure difference were the main factors controlling CO2flux in the ecosystem.关键词
高寒藏嵩草湿草甸湿地/涡度相关/CO2通量/变化特征Key words
Kobresia tibetica wet meadow wetland/eddy covariance/CO2flux/variation characteristics分类
资源环境引用本文复制引用
吴方涛,曹生奎,曹广超,汉光昭,林阳阳,成淑艳..青海湖高寒藏嵩草湿草甸湿地生态系统CO2通量变化特征[J].生态与农村环境学报,2018,34(2):124-131,8.基金项目
国家自然科学基金(31260130) （31260130）
中国科学院"西部之光"计划(科发人教字[2012]179号) （科发人教字[2012]179号）
中国博士后基金(2013M542400) （2013M542400）
青海省重点实验室平台建设项目(2014-Z-Y24,2015-Z-Y01) （2014-Z-Y24,2015-Z-Y01）
