红水河龙滩水库夏季CO2分压分布特征及影响因素

doi:10.11934/j.issn.1673-4831.2018.06.006

摘要/Abstract

摘要：

为研究红水河龙滩水库的CO₂浓度分布及影响因素，于2016年7月对红水河河段龙滩水库进行定点采样，测定水体理化参数并计算水体表层CO₂分压（p_CO₂）。结果表明：坝前到红水河入库水体表层p_CO₂值分3个区间，坝前至库中在64.28~152.56 Pa之间，库中过渡带在161.57~257.57 Pa之间，入库水体在126.45~264.29 Pa之间，入库水体和过渡区的p_CO₂均高于坝前。相关分析表明：表层水体p_CO₂与电导率、总溶解固体物（TDS）、氧化还原电位（ORP）呈显著正相关，与pH值呈显著负相关，说明水生生物光合-呼吸作用、碳酸盐岩溶体系是影响水库p_CO₂变化的重要因素。水库CO₂释放通量范围为9.06~78.80 mmol·m^-2·d^-1，均值为45.96 mmol·m^-2·d^-1，库区表层水体表现为大气CO₂的源，呈现坝前CO₂排放弱源过度到上游碳排放强源的空间变化特征，说明河流水体流经水库作用减缓了CO₂释放。

关键词: 龙滩水库, CO₂分压, CO₂排放通量, 相关分析

Abstract:

For studying the CO₂ emissions of Hongshui River Longtan Reservoir, the underway sampling was carried out to continuously survey the Longtan Reservoir of Hongshui River using a professional water sampler in July 2016. The partial pressure of CO₂(p_CO₂) are calculated using the water-chemical balance and the Henry's law. The results show that the data of p_CO₂ values on the surface water were divided into three intervals because the data of p_CO₂ values on the surface from near the dam to the middle section ranged from 64.28 to 152.56 Pa, the transition zone of the middle section ranged from 161.57 to 257.57 Pa, as well as inflow waters ranged from 126.45 to 264.29 Pa, which was higher than that of p_CO₂ before the dam. There was a significant positive correlation on surface water p_CO₂ with its TDS, Cond and ORP, and a significant negative correlation on surface water p_CO₂ with pH, which suggests aquatic biosynthesis-respiration, carbonate karst system are important factors affecting the change of reservoir p_CO₂. Reservoir CO₂ flux had a increasing trend from the dam to the end of the tail reservoir with the mean value of the CO₂ flux being 45.96 mmol·m^-2·d^-1 and ranged from 9.06 to 78.80 mmol·m^-2·d^-1. Reservoir water showed an atmospheric CO₂ source with an obvious variation characteristics changing from weak carbon source before the dam to strong carbon source to the upstream, which implies the river type reservoir would slow down the carbon emission of river water.

Key words: Longtan Reservoir, partial pressure of carbon dioxide, the CO₂ emission flux, co-relationship analysis

中图分类号:

曹玉平, 邓飞艳, 焦树林, 袁热林, 张倩. 红水河龙滩水库夏季CO₂分压分布特征及影响因素[J]. 生态与农村环境学报, 2018, 34(6): 521-527.

CAO Yu-ping, DENG Fei-yan, JIAO Shu-lin, YUAN Re-lin, ZHANG Qian. Research of Distribution Characteristics and Influencing Factors of p_CO₂ in Hong-shui River Longtan Reservoir in Summer[J]. Journal of Ecology and Rural Environment, 2018, 34(6): 521-527.

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红水河龙滩水库夏季CO₂分压分布特征及影响因素

Research of Distribution Characteristics and Influencing Factors of p_CO₂ in Hong-shui River Longtan Reservoir in Summer

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