乌裕尔河流域颗粒有机碳的来源：碳同位素证据

以2008、2009年所采集的乌裕尔河9个点位水体中的悬浮物为研究对象，对丰、枯水期颗粒有机碳（POC）含量、碳同位素组成（^13C、^14C）及表观年龄进行了系统测试与分析，以期探讨河流中颗粒有机碳来源与流域土壤侵蚀的关系。研究结果表明，该河流中颗粒有机碳（POC）主要来源于未受玉米残体及根系输入影响的深层土壤，且土...

Origin of particulate organic carbon in the Wuyuer River: Carbon isotopic evidences

Suspended solids were sampled at 9 sites on the Wuyuer River and its main tributaries in 2008-2009.Contents,stable carbon isotopes(13C) and cosmogenic carbon isotope(14C) compositions of particulate organic carbon(POC) in suspended solids were used to constrain the relationship between the sources of particulate organic carbon and soil erosion in drainage basin.Particulate organic carbon is mainly of organic matter of deep soil.Also,the organic matter in deep soil is dominated by grassland vegetation residue,and lack of corn root residue.Particulate organic carbon of suspended solids in Zhalong wetlands is mainly determined by modern carbon formed in it,with little or absence of terrestrial influence.14C apparent ages of POC of Wuyuer River and its main tributaries in high water periods are older than those in low water periods.The migration distance of particulate matter in rainfall season is shorter than that in rainless season.Compared to the other rivers,the characteristic and variability of 14C apparent ages of particulate organic carbon suggested that soil erosion in Wuyuer River is very severe,and show obvious seasonal difference.Considering the difference of origin and migration distance of particulate organic carbon,we calculated the contribution of main tributaries to Wuyuer River in high water periods from the mixing model.