长江大通站颗粒态黑碳和有机碳的季节变化及输出通量  

Seasonal Variations and Transport Fluxes of Particulate Black Carbon and Organic Carbon at Datong Station of the Yangtze River

作　　者：贺静 方引 林明兰 林田 HE Jing;FANG Yin;LIN Minglan;LIN Tian(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China)

机构地区：[1]上海海洋大学海洋生态与环境学院,上海201306

出　　处：《地球与环境》2023年第1期1-8,共8页Earth and Environment

基　　金：国家自然科学基金项目(42076205、41703087)。

摘　　要：近年来,随着碳循环过程认识的深入,陆源有机碳的水平迁移在河流和海洋两大生态系统中处于核心地位,厘清其输运通量具有重要意义。本研究于2018年1~12月在长江下游大通站进行月时间分辨率的水体采样,分析水体悬浮颗粒物中有机碳及黑碳浓度,研究其季节变化特征,估算截面通量。结果表明,长江大通站水体中总悬浮颗粒物(Total Suspended Solids, TSS)浓度范围为11.77~141.54 mg/L,平均值为44.07±32.80 mg/L;颗粒态有机碳(Particulate Organic Carbon, POC)浓度范围为0.37~1.52 mg/L,平均值为0.57±0.33 mg/L;颗粒态黑碳(Particulate Black Carbon, PBC)浓度范围为0.04~0.46 mg/L,平均值为0.10±0.11 mg/L。三个参数的季节变化一致,表现为夏季浓度最高,冬季最低,春、秋两季相当。PBC和POC与TSS呈显著的正相关关系,表明了长江流域降雨冲刷和径流携带颗粒物输入是影响大通站水体中PBC和POC浓度变化的主要因素。2018年流经长江大通站PBC和POC的通量分别为2.05×10^(11)g、1.05×10^(12)g, PBC通量占POC通量的19.54%;PBC和POC的输送通量均集中在丰水期,分别占全年通量的88.24%和79.57%。In recent years, with the deepening of the understanding of the carbon cycle process, the horizontal migration of terrestrial organic carbon plays an important role in river and ocean ecosystems, therefore, it is of great significance to clarify its transport fluxes. In this study, from January to December in 2018, surface water samples with monthly time resolution were collected at Datong Station in the lower reaches of the Yangtze River. The organic carbon and black carbon concentrations in the water suspended particulate matters were analyzed to understand their seasonal variations, and to estimate the corresponding fluxes. The results showed that the total suspended solids(TSS) concentrations ranged from 11.77 to 141.54 mg/L, with the average was 44.07 ±32.80 mg/L;the particulate organic carbon(POC) concentrations ranged from 0.37 to 1.52 mg/L, with the average was 0.57±0.33 mg/L;the particulate black carbon(PBC) concentrations ranged from 0.04 to 0.46 mg/L, with the average was 0.10±0.11 mg/L. The TSS, POC and PBC presented relatively consistent seasonal variations: the highest concentrations were observed in summer, while the lowest in winter, the spring and autumn were similar. Both PBC and POC were significantly positive correlated with TSS, which suggested that rainfall erosion and discharge carrying were the dominant sources that affected the variations of PBC and POC concentrations at Datong Station. In this study, the fluxes of PBC and POC at Datong Station of the Yangtze River were 2.05×10^(11)g/a and 1.05×10^(12)g/a, respectively. The PBC fluxes accounted for 19.54% of the POC fluxes. Moreover, the transported fluxes of POC and PBC were concentrated in the rainy season, accounting for 88.24% and 79.57% of the annual fluxes, respectively.

关 键 词：长江 有机碳 黑碳 通量 

分 类 号：X522[环境科学与工程—环境工程]