中国岩溶2016，Vol.35Issue(2)：134-143,10.DOI:10.11932/karst20160202
不同时间段青木关岩溶地下河水化学变化主导因素分析
Dominant factors controlling hydrochemical variation of karst underground river in different period,Qingmuguan,Chongqing
摘要
Abstract
Hydrochemical variation of Qingmuguan karst underground river in the typical karst valley area was monitored by using multi-parameter water quality analyzer.Dominant factors of the chemical dynamics were studied by principal component analysis method with monitoring data derived from three different time intervals,including that of monthly monitoring,storm event and farming period.Results showed that on a monthly scale,because of the dilution effect due to rainfall,the major underground river constituents such as pH and the concentrations of Ca2 + ,Mg2 + ,K+ ,Na+ and HCO -3 were lower at flooding or wet season than those of dry season.The hydrochemical variation was affected by five main components with an accumulated variance contribution rate of 90.75%,of which the dominant factor was identified as the rock-water interac-tion.In farming period,rainwater carried residual manure and nitrogenous,phosphate and potash fertilizers into the underground river,which resulted in the increase of electrical conductivity (EC)and Cl- ,NO -3 ,K+and Na+ contents.The hydrochemical variation was affected by three main components,with an accumula-ted variance contribution rate of 87.81%,of which the dominant factors were rock-water interaction and fer-tilization.During the storm event,the change of the ionic concentrations could be divided into four stages, including stationary,rising,stable and special periods.During the rising period,rainfall obviously effected on underground river and caused more active rock-water interaction and the increases of EC and the concen-trations of Ca2 + and HCO -3 .Significant impact of erosion and leaching due to rainfall on topsoil and fertiliz-ers resulted in obvious raises in undergroundriver Al,Fe,Cl- ,K+ ,Na+ and NO -3 contents.The hydro-chemical variation was affected by four main components with an accumulated variance contribution rate of 80.09%;and the dominant factors could be rock-water interaction,soil erosion and soil nutrient leaching.关键词
岩溶地下河/暴雨期/农耕期/水化学/主成分分析/青木关Key words
karst underground river/storm event/farming period/hydrochemistry/principal component a-nalysis/Qingmuguan分类
天文与地球科学引用本文复制引用
余琴,杨平恒,于正良,陈雪彬,吴鸿..不同时间段青木关岩溶地下河水化学变化主导因素分析[J].中国岩溶,2016,35(2):134-143,10.基金项目
国家自然科学基金项目(41103068) （41103068）
重庆市院士专项(CSTC2013JCYJYS20001) （CSTC2013JCYJYS20001）
2014年度重庆市国土房管科技计划项目(CQGT-KJ-2014056) （CQGT-KJ-2014056）
中央高校基本科研业务费专项(XDJK2014A016) （XDJK2014A016）
