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| 九龙江的碳酸盐体系、CO2分压及其调控 |
| Carbonate System and Partial Pressure of CO2 in the Subtropical Jiulongjiang River, China: A Discussion on Controlling Mechanisms |
| 投稿时间：2013-08-12 修订日期：2013-10-22 |
| DOI： |
| 中文关键词: 河流pCO2;碳酸盐体系;呼吸作用;九龙江 |
| 英文关键词: riverine pCO2;carbonate system;respiration;Jiulongjiang River |
| 基金项目:国家自然科学基金项目(41076042;40810069004)。 |
| 作者 | 单位 | E-mail | | 祁第1, 翟惟东2, 陈能汪1, 吴杰忠1 | 1. 厦门大学环境与生态学院, 福建厦门 361102
2. 国家海洋环境监测中心, 辽宁大连 116023 | wdzhai@126.com |
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| 中文摘要: |
| 于2011年枯水期和丰水期调查了九龙江的溶解氧、pH、溶解无机碳(DIC)和总碱度(TAlk),并计算水体CO2分压(pCO2)。九龙江溶解氧饱和度平均为67±18%(枯水期)和57±12%(丰水期),最低只有10%(枯水期)和35%(丰水期);pH为7.08±0.12(枯水期)和7.22±0.11(丰水期),最低只有6.88(枯水期)和6.98(丰水期);DIC为1027±620 μmol/kg (枯水期)和820±340 μmol/kg (丰水期);TAlk在枯水期为885±570 μmol/kg,比相应DIC低140±70 μmol/kg。水体TAlk受控于流域地质背景和化学风化的影响,而DIC既包含流域风化过程的产物HCO3-,也包含水柱呼吸过程和沉积物中其他生物地球化学过程释放的游离CO2。九龙江pCO2高达3470±1640 μatm (枯水期)和3590±1410 μatm (丰水期),超过大气平衡水平8.9~9.2倍。过饱和CO2与表观耗氧量的耦合分析表明,水柱呼吸作用只能说明九龙江高pCO2的66%~94%。 |
| 英文摘要: |
| The authors investigated the distributions of surface water dissolved oxygen (DO), pH, dissolved inorganic carbon (DIC) and total alkalinity (TAlk) and calculated the partial pressure of CO2 (pCO2) in the Jiulongjiang River, a subtropical river in Fujian Province, China. The average values of DO% and pH were 67±18% and 7.08±0.12 in the dry season, and 57±12% and 7.22±0.11 in the flood season. The lowest values of DO% and pH were 10% and 6.88 in the dry season, and 35% and 6.98 in the flood season. The average DIC was 1027±620 μmol/kg in the dry season and 820±340 μmol/kg in the flood season. TAlk was 885±570 μmol/kg in the dry season. TAlk was mainly controlled by the geological background and chemical weathering in the watershed. However, most of free CO2 was associated with aerobic respiration in water columns and anaerobic processes in the sediments. Aqueous pCO2 in the Jiulongjiang River was 3470±1640 μatm on average in the dry season and 3590±1410 μatm on average in the wet season, respectively. Based on data analyses between supersaturated CO2 and apparent oxygen utilization, it was concluded that the in-situ aerobic respiration accounts for 66%~94% of the supersaturated CO2 in the Jiulongjiang River, and the remaining supersaturated CO2 may come from denitrification in the sediments. |
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