塘西河颗粒有机碳浓度季节变化及其来源分析  

Seasonal Variations and Sources of Particulate Organic Carbon in Tangxi River

作　　者：张金流[1] 鲍祥[1] 姚尧[1] 何雪兵 

机构地区：[1]合肥学院生物与环境工程系,安徽合肥230601

出　　处：《环境科学与技术》2016年第2期201-205,共5页Environmental Science & Technology

基　　金：安徽高校省级自然科学研究重点项目(KJ2014A214);合肥学院人才基金(13RC04);合肥学院学科带头人培养对象项目(2014dtr02);安徽省大学生创新训练项目(AH201411059005)

摘　　要：基于2014年塘西河下游水体中颗粒有机碳（POC）、叶绿素a为期1年的野外调查,结合颗粒有机物C/N比值、POC浓度与叶绿素a浓度比值（POC/Chl a）及降雨量等数据,分析了塘西河下游水体中POC浓度的季节变化规律、影响因素及其主要来源。结果表明,塘西河下游水体中POC浓度夏季最高,冬季最低,呈现出夏季〉春季〉秋季〉冬季的变化趋势;POC浓度与叶绿素a浓度呈现基本一致的变化趋势,说明两者具有共同的来源,但陆源输入对POC浓度变化产生一定的影响;水体中颗粒有机物C/N比值在5.11~8.15之间,年平均值6.12,POC/Chl a比值在16.24~32.18之间,年平均值为21.47,说明塘西河下游水体中POC主要来源于内源。通过计算,内源对水体中POC的贡献率在40.4%~80.07%之间,年平均值为62.55%,春、夏、秋、冬季内源贡献率分别是59.95%、70.24%、59.84%和58.48%。Based on the field survey data of particulate organic carbon and chlorophyll a concentration in Tangxi River in2014, combined with particulate organic matter C/N, POC/Chl a and rainfall data, the seasonal variation of POC concentration in Tangxi River downstream water was analyzed, the influencing factors of POC concentration change and the main sources were discussed. The results showed that POC concentration had the highest values in summer and lowest in winter, with POC concentration values from high to low at different seasons as summer, spring, autumn and winter. The POC concentration and chlorophyll a concentration in water have almost the same change trend, but terrigenous inputs affect its concentration. The C/N ratio of particulate organic matter in water was between 5.11 and 8.15, with annual average value as 6.12, POC concentration and chlorophyll a concentration ratio（POC/Chl a） is between 16.24 and 32.18, with annual average value as 21.47, indicating that POC in downstream water of Tangxi River is mainly from endogenous. By calculation, endogenous contribution rate is between 40.4% and 80.07%, the annual average is 62.55%, and endogenous contribution rate at different seasons from spring to winter is 59.95%, 70.24%, 59.84% and 58.48%, respectively.

关 键 词：颗粒有机碳 季节变化 来源 C/N比值 POC/Chl a比值 

分 类 号：X142[环境科学与工程—环境科学]