洪家渡水库溶解二氧化碳分压的时空分布特征及其扩散通量

生态学杂志

洪家渡水库溶解二氧化碳分压的时空分布特征及其扩散通量

喻元秀^1,3;刘丛强¹;汪福顺²;王宝利¹;王仕禄¹;刘芳¹

¹中国科学院地球化学研究所环境地球化学国家重点实验室，贵阳 550002；²上海大学环境与化工学院，上海 201800；³中国科学院研究生院，北京 100039

收稿日期:2008-01-10 修回日期:1900-01-01 出版日期:2008-07-10 发布日期:2008-07-10

Spatiotemporal characteristics and diffusion flux of partial pressure of dissolved carbon dioxide (pCO₂) in Hongjiadu reservoir.

YU Yuan-xiu^1,3;LIU Cong-qiang¹;WANG Fu-shun²;WANG Bao-li¹;WANG Shi-lu¹;LIU Fang¹

¹State Key Laboratory of Environmental Geochemistry, Institute of Geoch
emistry, Chinese Academy of Sciences, Guiyang 550002, China;²School of En
vironmental and Chemical Engineering, Shanghai University, Shanghai 201800, China;³Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Received:2008-01-10 Revised:1900-01-01 Online:2008-07-10 Published:2008-07-10

摘要/Abstract

摘要： 为了了解水库温室气体的释放特征，于2006年4月、7月、10月和2007年1月对中国西南喀斯特地区新建的洪家渡水库入库水体、出库水体和水库坝前水体的CO₂分压（pCO₂）特征进行了分析。结果表明：入库河流pCO₂为春季<夏季<秋季<冬季，其中，六冲河全年平均值为488 μatm，凹水河全年平均值为624 μatm；水库库区表层水体pCO₂冬季最高，春季最低，分别为925和279 μatm，全年平均值为598 μatm；在水体垂直剖面上，pCO₂随水深的增加而增加；出库水体pCO₂夏季最高，达8 417 μatm，春季最低，为382 μatm，全年平均值为3 260 μatm。就全年平均而言，入库水体、水库库区表层水体以及出库水体pCO₂均高于大气CO₂分压（380 μatm），其向大气中释放的CO₂通量分别为3.93～6.29、4.87～7.79和64.29～102.86 mmol·m^-2·d^-1。该水库总体上是大气CO₂的源，天然河流水体经水库作用后CO₂释放强度增加，导致水库泄水pCO₂为天然河流的16倍、水库库区表层水体的13倍，其向大气中释放CO₂量也相应增加。因此，水库泄水的CO₂释放问题值得关注。

关键词: 渭北旱塬, 苹果种植分区, 土壤水分特征, 土壤干层

Abstract: In order to understand the characteristics of greenhouse gases emission from artificial reservoirs, the distribution characteristics of partial pressure of dissolved carbon dioxide (pCO₂) in inflow waters, outflow waters, and the waters in Hongjiadu reservoir, a newly-built reservoir located in Guizhou Province of Southwest China, were analyzed in April, July and October 2006 and January 2007. The results showed that the pCO₂ value in inflow waters was spring <summer<autumn<winter, and the annual average pCO₂ in the inflow waters from Liuchong river and Washui river was 488 and 624 μatm, respectively. The pCO₂ in reservoir epilimnion reached to the highest value (925 μatm) in winter and the lowest (279 μatm) in spring, with the annual average of 598 μatm. The pCO₂ in water column increased with water depth. In the outflow waters, pCO₂ was the highest (8 417 μatm) in summer and the lowest in winter (382 μatm), with the annual average value of 3 260 μatm. The annual average pCO₂ in inflow waters, reservoir epilimnion, and outflow waters was higher than that of air (380 μatm pCO₂), and the diffusion flux of CO₂ at waterair interface was 3.93-6.29, 4.87-7.79 and 64.29-102.86 mmol·m^-2·d^-1, respectively, showing that the reservoir should be a CO₂ source of the atmosphere. Through the action of the reservoir, the diffusion flux of CO₂ was enhanced, with the pCO₂ in outflow waters being 16 and 13 folds of that in inflow waters and reservoir epilimnion, respectively. Accordingly, much attention should be paid on the CO₂ emission from the outflow waters of the reservoir.

Key words: Weibei dry upland, Apple planting subarea, Soil moisture characteristics, Dried soil layer

喻元秀;刘丛强;汪福顺;王宝利;王仕禄;刘芳 . 洪家渡水库溶解二氧化碳分压的时空分布特征及其扩散通量[J]. 生态学杂志.

YU Yuan-xiu^1,3;LIU Cong-qiang¹;WANG Fu-shun²;WANG Bao-li¹;WANG Shi-lu¹;LIU Fang¹ . Spatiotemporal characteristics and diffusion flux of partial pressure of dissolved carbon dioxide (pCO₂) in Hongjiadu reservoir. [J]. cje.