龙川江楚雄站碳侵蚀通量的动态分析  

Dynamic analysis of carbon erosion fluxes from Chuxiong Station at Longchuan River watershed

作　　者：何敏[1] 刘鹏[1] 吕喜玺[2] 丁文荣[3] 

机构地区：[1]昆明理工大学津桥学院,昆明650106 [2]新加坡国立大学地理系,新加坡120605 [3]云南师范大学旅游与地理科学学院,昆明650092

出　　处：《环境科学学报》2015年第8期2497-2503,共7页Acta Scientiae Circumstantiae

基　　金：云南省教育厅科学研究基金(No.2011C002);国家自然科学基金(No.41101099)~~

摘　　要：选取龙川江楚雄水文站进行了为期3年的采样,分析了水体中各形式碳的含量,并估算各碳的输送通量.结果表明:楚雄站3年的碳通量(FTC)分别为27.12×106g·km-2·a-1、24.87×106g·km-2·a-1和10.34×106g·km-2·a-1,分析流域在对碳输送过程中,以输送无机碳为主,分别占输送总量的89.7%、90.3%及91.9%;而汛期碳输送量分别占全年总量的90.9%、84.9%和83.8%,表现出流域汛期对碳的搬运量远远高于非汛期;溶解性有机碳通量(FDOC)与颗粒有机碳通量(FPO C)平均比为0.82,不同季节表现情况不一,非汛期溶解性有机碳(DOC)与颗粒有机碳(POC)含量相当,汛期机械侵蚀作用增强,导致FPO C远远大于FDOC,反映汛期对流域侵蚀作用以机械剥蚀为主,化学侵蚀为辅.研究期内恰遇2008年一场洪水,11月碳的侵蚀通量为8.53×106g·km-2·a-1,其中溶解性无机碳(DIC)、溶解性有机碳(DOC)和颗粒有机碳(POC)的输送量分别为7.37×106、0.36×106、0.80×106g·km-2·a-1,分别占2008年全年相应形式碳总量的33.3%、34.4%和59.9%,为当年非汛期碳侵蚀总量的2.3倍,反映洪水期的碳输出量对流域碳输出总量及构成存在不可忽略的贡献.Longchuan River hydrological stations in Chuxiong were sampled for three years. Water contents for different forms of carbon were analyzed,and the carbon fluxes were estimated. The results showed that three-year carbon fluxes（ FTC） at Chuxiong Station were 27. 12 × 10^6g·km^-2·a^-124. 87× 10^6g·km^-2·a^-1nd 10. 34 × 10^6g·km^-2·a^-1respectively. Inorganic carbon accounted for 89. 7%,90. 3% and 91. 9% of the total carbon transport in three watersheds,respectively. Watershed transports higher amount of substance in flood season than dry season. The ratio of FDOCand FPOC is 0. 82. In dry season,Dissolved Organic Carbon（ DOC） is about the same amount of Particle Organic Carbon（ POC）. In comparison,FDOCis far greater than FPOCin flood season due to the enhanced mechanical erosion. Carbon-based erosion is mainly contributed by mechanical erosion,complemented by chemical erosion. The study area captured a flood period in 2008. The carbon erosion amount is 8. 53 × 10^6g·km^-2·a^-1n November.The Dissolved Inorganic Carbon（ DIC）,DOC and POC transfer amounts are 7. 37 × 10^6,0. 36 × 10^6,and 0. 80 × 10^6g·km^-2·a^-1accounting for 33.3%,34. 4% and 59. 9% of total carbon transfer in 2008,respectively,and 2. 3 times dry erosion amount. This trend shows that carbon transfer in the flood period significantly contributes to the total amount all year round.

关 键 词：龙川江 碳通量 汛期 非汛期 流域侵蚀 

分 类 号：X522[环境科学与工程—环境工程]