摘要
为探讨同一岩溶流域不同时期水体理化性质及无机碳通量的不同特征及其影响因素,本文于2012年5月8日-17日,7月6日-13日,12月3日-10日对漓江流域进行了洪水期、平水期及枯水期的高频率昼夜监测.结果表明,水动力条件是控制研究区水体理化性质的首要因素,且降雨条件下控制力增强,稀释作用占主导地位,pH值、水温、电导率及离子质量浓度随降雨过程降低;无降雨条件下,水体理化性质主要受温度及水生植物光合作用、呼吸作用控制,表现出明显的昼夜变化特征:水温及pH值白天高、夜晚低,电导率及HCO-3离子质量浓度白天低、夜晚高.碳通量由高到低分别为洪水期(平均4.43kg C/s)、平水期(平均1.51kg C/s)、枯水期(平均1.07kg C/s),受水动力条件及HCO-3离子质量浓度共同控制,其中水动力条件占主导地位,但二者同时发生变化时,碳通量则随变异系数较大的一方波动.
In order to investigate the hydrogeochemical characteristics and the changes of inorganic carbon flux of a karst watershed at different periods of the year and their influencing factors,diurnal high-frequency monitoring was made of the Lijiang River at the flood period（from 8 to17 of May）,the usual discharged period（from 6 to 13 of July）and the dry period（from 3 to 10 of December）in 2012.Hydrodynamics was shown to be the primary factor that controlled the hydrogeochemical characteristics of the water body in the study area,especially during rainfall.The dilution effect played a leading role.Temperature,pH,EC and ion concentration dropped steadily during the course of rainfall.On the other hand,when there was no rainfall,the hydrogeochemical characteristics were mainly affected by temperature and the photosynthesis of aquatic plants with a significant diurnal pattern,where water temperature and pH were high at daytime and low at night while EC and HCO3-concentration were low at daytime and high at night.The flood period had the highest carbon flux（4.43 kg C/s）,followed by the usual discharged period（1.51 kg C/s）and the low period（1.07 kg C/s）.It was co-controlled by hydrodynamic condition and HCO3-concentration.However,it varied with the factor which was with the high CV value while flux and HCO3-concentration varied simultaneously.
作者
何若雪
孙平安
于奭
何师意
HE Ruo-xue1,2, SUN Ping-an1, YU Shi1, HE Shi-yi1(1. Institute of Karst Geology, Chinese Academy of Geological Sciences/Key Laboratory of Karst Dynamics, MLR and GZAR , Guilin , Guangxi 541004, China ; 2. Science and Technology Office, Chengdu Technological University, Chengdu 611730, Chin)
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第3期150-158,共9页
Journal of Southwest University(Natural Science Edition)
基金
国家重点研发计划项目(2016YFC0502302)
长江岩溶流域碳循环综合环境地质调查项目(DD20160305-01)
国家自然科学基金项目(41402324)
关键词
漓江
碳通量
高分辨率监测
the Lijiang River
carbon flux
high-frequency monitoring
