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

作　　者：秦勇 孙鹤 李姗泽 顾菲 曹珍 李小影 阎腾飞[1,3] QIN Yong;SUN He;LI Shanze;GU Fei;CAO Zhen;LI Xiaoying;YAN Tengfei(Xinyang Agriculture and Forestry University,Xinyang 464000,Henan,China;Department of Water Ecology and Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Xinyang Research Center of Engineering and Technology on Carbon Neutrality of the Riparian Zone in Huaihe River Basin,Xinyang 464000,Henan,China;School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]信阳农林学院,河南信阳464000 [2]中国水利水电科学研究院水生态环境研究所,北京100038 [3]信阳市淮河流域消落带碳中和工程技术研究中心,河南信阳464000 [4]上海大学环境与化学工程学院,上海200444

出　　处：《水利水电技术（中英文）》2024年第2期123-132,共10页Water Resources and Hydropower Engineering

基　　金：河南省自然科学基金项目(222300420271);国家自然科学基金项目(51809287);第八届青托工程项目(2022QNRC001);信阳农林学院青年基金(QN2022028,QN2022029);信阳农林学院科技创新团队(XNKJTD-002)。

摘　　要：【目的】河流筑坝对有机碳具有重要的拦截作用,影响内陆水体碳循环。目前,河道型水库沉积物有机碳空间分布特征和自生有机碳埋藏通量仍不明确。【方法】采用沉积物柱芯法、沉积物物理化学参数和碳同位素二元混合模型,对河道型水库(银盘水库)沉积物有机碳埋藏开展了调研。【结果】结果显示:银盘水库沉积物有机碳含量变化范围为0.99%~1.32%,库中和坝前沉积柱有机碳含量均值分别为1.12%和1.16%;内源有机碳与总磷呈现显著正相关;有机碳埋藏速率变化范围为98.7~348.9 g C·m^(-2)·a^(-1),平均值为223.8 g C·m^(-2)·a^(-1),有机碳埋藏通量和内源有机碳埋藏通量分别为2.5×10^(9)g C·a^(-1)和1.8×10^(9)g C·a^(-1);内源有机碳对沉积物总有机碳的贡献比例为69.0%~75.2%,平均值为71.5%。【结论】结果表明:河道型水库沉积柱有机碳含量从库中到坝前没有明显变化;水库内源有机质的生成与营养盐输入和水体滞留时间密切相关;银盘水库有机碳埋藏通量相当于全球水库有机碳埋藏通量的0.04‰,河道型水库是个重要的潜在碳汇。研究结果能够为河道型水库碳埋藏研究和水电清洁型评估提供参考依据。[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 investihated,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 value 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 significant 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 2.5×10^(9)g C·a^(-1)and 1.8×10^(9)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 

分 类 号：X524[环境科学与工程—环境工程]