水利水电技术（中英文）2024，Vol.55Issue(2)：123-132,10.DOI:10.13928/j.cnki.wrahe.2024.02.011
河道型水库沉积物有机碳空间分布特征及其埋藏效应
Spatial variation and burial effect of sedimentary organic carbon in the channel-type reservoir
摘要
Abstract
[Objective]River damming plays an important role in intercepting organic carbon(OC),which affects carbon cycles of inland waters.Nowadays,the spatial variation of sedimentary OC and the magnitude of autochthonous OC burial flux in the channel-type reservoir are still uncertain.[Methods]The OC burial in the channel-type reservoir(Yinpan Reservoir)was investi-hated,by using sediment cores,physicochemical data of sediment and a two-end-member mixing model of carbon isotope values.[Results]The result showed that the sedimentary organic carbon of Yinpan Reservoir varied from 0.99％to 1.32％.The mean val-ue of OC of sediment core in the middle of reservoir and the front of the dam was 1.12％and 1.16％,respectively.There was a sig-nificant positive relationship between autochthonous OC and TP(total phosphorus).The OC burial rate(OCBR)of the Yinpan Reservoir ranged from 98.7 g C·m-2·a-1 to 348.9 g C·m-2·a-1,with a mean value of 223.8 g C·m-2·a-1,and the burial flux of OC and autochthonous organic carbon in the Yinpan Reservoir was 2.5×109 g C·a-1 and 1.8×109 g C·a-1,respectively.The contribution of autochthonous organic carbon to total organic carbon in Yinpan Reservoir varied from 69.0％to 75.2％,with an average of 71.5％.[Conclusion]The OC concentration of sediment cores in the channel-type reservoir didn't change significantly from the middle of reservoir area to the front of the dam.The autochthonous OC generated within the reservoir was closely associated with nutrient input and hydraulic retention time.The OC burial flux of the Yinpan Reservoir accounted for 0.04‰ of OC burial flux of global reservoirs,indicating that channel-type reservoir is an important potential carbon sink.The research findings provide a reference basis for the study of OC burial in the channel-type reservoirs and the cleanliness assessment of hydropower.关键词
河道型水库/碳循环/有机碳埋藏/碳埋藏通量/沉积物柱芯/长江流域/影响因素Key words
channel-type reservoir/carbon cycle/organic carbon burial/carbon burial flux/sediment cores/Yangtze River ba-sin/influence factor分类
环境科学引用本文复制引用
秦勇,孙鹤,李姗泽,顾菲,曹珍,李小影,阎腾飞..河道型水库沉积物有机碳空间分布特征及其埋藏效应[J].水利水电技术（中英文）,2024,55(2):123-132,10.基金项目
河南省自然科学基金项目(222300420271) （222300420271）
国家自然科学基金项目(51809287) （51809287）
第八届青托工程项目(2022QNRC001) （2022QNRC001）
信阳农林学院青年基金(QN2022028,QN2022029) （QN2022028,QN2022029）
信阳农林学院科技创新团队(XNKJTD-002) （XNKJTD-002）
