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| 鄂西喀斯特水库水化学时空特征及其对生物碳泵效应的指示 |
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朱良辰1, 陈敏1,2,3, 严宇鹏4, 刘佳1,2,3, 肖尚斌1,2,3, 张鑫毅1, 杨紫剑1
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1.三峡大学水利与环境学院;2.三峡库区生态环境教育部工程中心;3.三峡水库生态系统湖北省野外科学观测研究站;4.江西省萍乡市湘东区水利局
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| 摘要: |
| 以鄂西地区碳酸盐岩出露的黄柏河流域西北口水库为研究对象, 通过针对不同季节、多个特征断面表层和垂向水体基本理化因子和主要离子的原位采样监测与室内实验分析, 从水库水化学变化的角度解析了水库生物碳泵效应(BCP)的时空规律、影响因素和碳汇能力. 结果表明, 西北口水库水体呈弱碱性, 水化学类型为HCO3-Ca.Mg型. 基本理化因子时空变异性较强, 水温、叶绿素a和pH整体上表现为夏高冬低, 水库区高于河流区;电导率、TDS和pCO2则相反. 入库河水离子浓度普遍高于水库区, 库内HCO3-、Ca2+、Mg2+、K+浓度均表现出夏低冬高的特征. 生物碳泵效应在时间上表现为夏季最强, 春秋次之, 冬季最弱;在空间上表现为水库区强于河流区, 库尾区域强于库首. 水库稳定的热分层能够促进生物碳泵效应并抑制碳排放. 水体叶绿素a与pCO2、HCO3-浓度的相关性一定程度反映出西北口水库受到明显的碳控制. 经初步估计, 西北口水库BCP碳汇通量为0.04~0.07 t/(km2/d) , 与其他喀斯特水库处于相似水平. 综合分析可知, 我国喀斯特水库BCP碳汇通量约为全国水库碳排放通量的4%~26%, 在水库碳源汇核算及固碳增汇中的作用不可忽视. |
| 关键词: 喀斯特水库 水化学特征 时空变化 生物碳泵 碳汇 |
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| 基金项目:宜昌市自然科学研究项目(A23-2-023) ; 国家自然科学基金项目(41807513) |
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| Spatial and temporal variations of hydrochemistry in a karst reservoir in western Hubei and its indication for biological carbon pump effect |
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Zhu Liangchen,Chen Min,Yan Yupeng,Liu Jia,Xiao Shangbin,Zhang Xinyi,Yang Zijian
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College of Hydraulic and Environment Engineering, China Three Gorges University
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| Abstract: |
| This study focuses on Xibeikou Reservoir in the Huangbaihe River Basin of western Hubei, where carbonate rocks are exposed. In-situ sampling and laboratory analysis were conducted to monitor and analyze the basic physicochemical parameters and major ions in the surface water and vertical profiles for different seasons and different characteristic cross sections. The spatial and temporal variations, driving factors, and carbon sink capacity of the biological carbon pump(BCP) effect were analyzed from the perspective of hydrochemistry changes. The results indicated that water in Xibeikou Reservoir was weakly alkaline with a water chemistry type of HCO3-Ca.Mg. The spatiotemporal variations of basic physicochemical factors were significant. Water temperature, chlorophyll-a, and pH were generally higher in summer and lower in winter, with higher values observed in the reservoir area compared to the riverine area, while electrical conductivity, TDS, and pCO2 showed the opposite trends. The ion concentrations in the inflow river were generally higher than those in the reservoir. Within the reservoir, concentrations of HCO3-, Ca2+, Mg2+, and K+ were lower in summer while higher in winter. The BCP effect was strongest in summer, followed by spring and autumn, and weakest in winter. Spatially, it was more pronounced in the reservoir area compared to the riverine area, and stronger in the tail area of the reservoir compared to the head. The stable thermal stratification of the reservoir enhanced the BCP effect and suppressed carbon emissions. The correlations between water chlorophyll-a and pCO2 and HCO3- concentrations suggested significant carbon control in the Xibeikou Reservoir. It was preliminarily estimated that the BCP carbon sink flux of Xibeikou Reservoir ranged from 0.04 to 0.07 t/(km2.d), which was comparable to other karst reservoirs. Overall, the estimated BCP carbon sink flux in karst reservoirs in China accounted for approximately 4% to 26% of national reservoir carbon emission flux, highlighting their importance in carbon source-sink accounting and carbon sequestration enhancement. |
| Key words: Karst reservoir Hydrochemical characteristics Spatiotemporal variations Biological carbon pump Carbon sink |
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