摘要
【目的】研究干早区内荒漠-湿地生态系统CO_2通量的变化特征,区域CO_2通量的研究提供支持。【方法】利用涡度相关系统对艾比湖地区荒漠-湿地生态系统进行观测,分析冬末-春季(3月21日~5月20日)CO_2通量的动态变化特征。【结果】这一时期艾比湖地区荒漠-湿地生态系统CO_2通量的变化范围为-1.03~1.04 mg/(m^2·s);冬末、初春表现为碳释放,春季为碳吸收;最大吸收值出现在5月19日的11:30,为-1.03 nag/(-·s),最大释放值出现在5月15日的23:00,为1.04 mg/(m^2·s);白天碳吸收量随着温度的升高而增加,夜晚在15℃C时CO_2释放量达到最大值。【结论】在整个时间段,初春、春季白天表现为碳吸收,夜晚为碳释放;白天NEE值表现为冬末>初春>春季,夜晚NEE值表现为冬末<初春<春季;冬末除正午左右生态系统表现为碳吸收,其余时间均表现为碳释放;总体表现为碳释放,释放总量为3.68 mg/m^2。
[Objective] To research arid desert area-wetland ecosystem CO2 flux variations,the purpose is to provide support for the research of CO2 flux in this area.[Method] The CO2 flux in the Ebinar Lake area from March 21,2012 to May 20,2012 was measured by eddy convariance technology.[Result] The results showed that the CO2 flux changed in the range of-1.03 ～1.04 mg/（m2 · s） in the Ebinur Lake area desert-wetland ecosystem during this period ; At the end of winter and early spring the carbon was released,and carbon sequestration was found in spring time; Maximum absorption values appeared in the 11：30 of May 19,maximum release values appeared in the 23：00 of May 15.Daytime carbon uptake increased with increasing temperature,but druing the night at 15℃ carbon dioxide emissions reached the maximum.[Conclusion]During the whole period,carbon was absorbed during the daytime in spring,but at night time carbon was released;Daytime NEE values were as follows：late winter 〉 early spring 〉 spring; night time NEE values showed：late winter 〈 early spring 〈 spring ; At the end of winter the ecosystem showed carbon was absorbed only around the midday,and at other times carbon was released.The overall performance of the ecosystem was carbon release.The total amount released was 3.68mg/m2.
出处
《新疆农业科学》
CAS
CSCD
北大核心
2014年第4期714-722,共9页
Xinjiang Agricultural Sciences
基金
国家自然基金重点项目子课题(41130531)
