山东大沽河溶解性碳的时空分布及影响因素

	山东大沽河溶解性碳的时空分布及影响因素
其他题名	Tempo-spatial distribution and its influencing factors of dissolved carbon in the Dagu River, Shandong Province
	丁冰岚 1,2; 姜德娟1 ; 李新举 2; 夏云 3
发表期刊	农业环境科学学报
ISSN	1672-2043
	2022
卷号	41 期号:3 页码:670-680
关键词	溶解性无机碳(DIC) 溶解性有机碳(DOC) 时空分布 CO_(2)分压(pCO_(2)) 大沽河
英文摘要	To understand the dynamic distribution and biogeochemical processes of carbon in rivers, seasonal and spatial characteristics of dissolved carbon(DIC and DOC)concentrations in the Dagu River, Shandong Peninsula, were investigated based on water samplings and analysis from 2018 to 2019. Distribution and its influencing factors of pCO_2 were evaluated. The results showed that:the DIC concentration in the Dagu River ranged from 2.55 mg·L~(-1) to 34.08 mg·L~(-1) with an average of(12.977.25)mg·L~(-1). The DIC concentration was affected by geological environment, climatic and hydrological conditions, and cascade damming, which significantly varied over time and space(P<0.05);DIC was highest during winter and increased towards the downstream. The DOC concentration ranged from 4.22 mg·L~(-1) to 62.62 mg·L~(-1) with an average of(15.3410.24)mg·L~(-1). The DOC concentration exceeded the DIC concentration, indicating that dissolved carbon was dominated by DOC rather than DIC in the Dagu River. Moreover, there was no obvious seasonal and spatial variation for DOC, mainly owing to intense human activities, such as land use type, sewage discharge, and river damming. Thirty-five percent of the samples indicated as a source of atmospheric CO_2. pCO_2 was higher in the upper reaches than in the middle and lower reaches, and higher in summer and autumn than in spring and winter(P<0.05). In general, strong photosynthesis in the Dagu River resulted in high DOC level but low pCO_2. Therefore, the Dagu River generally displayed atmospheric CO_2 sink.
中文摘要	为认识河流生态系统中的碳动态分布及生物地球化学过程,基于2018—2019年的现场监测与水样分析数据,揭示山东半岛大沽河河流溶解性碳[包括溶解性无机碳(DIC)和溶解性有机碳(DOC)]浓度的季节和空间特征;在此基础上,对河流CO_(2)分压(p CO_(2))分布及影响因素进行了初步探讨。结果表明:大沽河DIC浓度分布在2.55~34.08 mg·L^(-1)之间,均值为(12.97±7.25)mg·L^(-1);受流域地质环境、气候水文条件、梯级筑坝等因素的影响,DIC呈明显的时空差异特征(P《0.05),其在冬季最高,自上游至下游呈显著增加趋势。DOC浓度范围为4.22~62.62 mg·L^(-1),均值为(15.34±10.24)mg·L^(-1),高于DIC含量,因此大沽河溶解性碳总体以DOC为主;受人类活动(土地利用方式、污水排放、河流筑坝等)的强烈影响,DOC未表现出明显的时空差异。大沽河有35%的河流样点表现为大气CO_(2)的源;p CO_(2)上游明显高于中下游,夏秋季高于春冬季(P《0.05)。研究表明,大沽河光合作用总体比较强烈,导致水体中DOC浓度较高、p CO_(2)较低,因此大沽河总体表现为大气CO_(2)的汇。
文章类型	期刊论文
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:7189237
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/34179
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
作者单位	1.中国科学院海岸带环境过程与生态修复重点实验室,中国科学院烟台海岸带研究所,山东烟台264003; 2.山东农业大学资源与环境学院,山东泰安271018; 3.西北农林科技大学资源环境学院,陕西杨凌712100
推荐引用方式 GB/T 7714	丁冰岚,姜德娟,李新举,等. 山东大沽河溶解性碳的时空分布及影响因素[J]. 农业环境科学学报,2022,41(3):670-680.
APA	丁冰岚,姜德娟,李新举,&夏云.(2022).山东大沽河溶解性碳的时空分布及影响因素.农业环境科学学报,41(3),670-680.
MLA	丁冰岚,et al."山东大沽河溶解性碳的时空分布及影响因素".农业环境科学学报 41.3(2022):670-680.