寒区滨河湿地生态系统碳通量特征及影响因素

Carbon Flux Characteristics and Influencing Factors of Riverside Wetland Ecosystem in Cold Region

湿地碳循环在全球气候变化中起着重要作用,而湿地碳通量特征及其影响因素研究是湿地碳循环研究重点关注的问题之一。基于金河湾湿地涡度相关观测系统的实测试验数据,系统分析了寒区滨河湿地生态系统净碳交换日际和季节两种尺度的动态变化机制,总结了碳源、碳汇变化规律,并探讨了气象要素对净碳交换量和湿地总生态系统生产力的影响。结果表明,金河湾湿地生态系统净碳交换在日尺度上呈"U"型分布,午时左右达到最高值;季节尺度上,自9月中旬至次年4月初表现为碳源,其余时间表现为碳汇,持续时间约5个月,总固碳量约631.62g/m2;相较于其他湿地生态系统,寒区湿地由于气温低、湿度大,净碳交换量和总生态系统生产力相对较小。

Wetland carbon cycle plays an important role in global climate change,and the study on the characteristics of carbon fluxes and its influencing factors is one of the most important issues in the study of wetland carbon cycle research.Based on the test data of eddy covariance observation system in Jinhe Bay wetland,this paper analyzed the dynamic variation mechanism of net carbon exchange both in diurnal and seasonal scale,clarified the conversion law of carbon source and carbon sink and its intensity,and the influence of each meteorological factor on the overall viability of wetland ecosystem was discussed.The results show that the net carbon exchange displayed a ＂U＂ type distribution in interdiural scale,and reached the peak value at noon.While in seasonal scale,the wetland ecosystem performed carbon source from middle of September to early April of the following year,the rest showed carbon sink,and lasted for about five months,the total carbon sequestration was 631.62 g/m2.Compared to other wetland ecosystems,due to low temperature and humidity,the net carbon exchange capacity and total ecosystem productivity are relatively small in this experimental area.