摘要
以贵州石漠化地区的3个洞穴为研究对象,通过对其地表土与地下漏失水土进行监测与采样分析,研究了不同地质环境条件中地表土壤与洞穴漏失水土的理化性质特征。结果表明,地表石漠化程度越高,岩溶裂隙管道的联通性越强,地下漏失水的滴率变幅越大,漏失土中的粘粒含量越低;在相同岩性条件下,石漠化程度越高,地表土壤pH值与元素含量越高;石将军洞漏失水Ca^(2+)、Mg^(2+)、Sr^(2+)浓度平均值分别为31.48,17.65,0.026mg/L,韩家冲洞分别为58.39,2.49,0.074mg/L,荣发洞分别为38.29,25.33,0.037mg/L;受岩性差异影响,韩家冲洞漏失水中的Mg^(2+)浓度相对较低,Ca^(2+)、Sr^(2+)浓度相对较高;受气候条件差异影响,荣发洞洞漏失水中的Ca^(2+)、Mg^(2+)、Sr^(2+)浓度均高于石将军洞;洞穴漏失水对漏失土长期的化学侵蚀作用导致漏失土pH值与元素含量高于地表土。
In this study,surface soil and underground leakage water and soil were monitored and sampled for analysis over 3caves in rocky desertification area in Guizhou,to research the physicochemical properties of surface soil and cave leakage water and soil under different geological environments.Results indicated that severe surface rocky desertification led to strong connectivity in fissure conduits of karst and large variation in drip rate of underground leakage water and soil,together with low clay content in leakage soil;pH and element contents became higher with more severe rocky desertification under the same lithology condition;mean values of Ca2＋,Mg2＋,and Sr2＋in leakage water were 31.48mg/L,17.65mg/L,and 0.026mg/L in Shijiangjun Cave,58.39mg/L,2.49mg/L,and 0.074mg/L in Hanjiachong Cave,and 38.29mg/L,25.33mg/L,and 0.037mg/L in Rongfa Cave,respectively;the concentration of Mg2＋was low and those of Ca2＋and Sr2＋were high in Hanjiachong Cave for the influence of lithology difference,while the concentrations of Ca2＋,Mg2＋and Sr2＋in leakage water of Rongfa Cave were higher than those of Shijiangjun Cave,which was influenced by weather condition;pH and element contents in leakage soil were higher than those in surface soil,which was the result of long-term chemical erosion of cave leakage water to leakage soil.
出处
《水土保持学报》
CSCD
北大核心
2016年第6期111-117,共7页
Journal of Soil and Water Conservation
基金
国家"十三五"重点研发计划项目(2016YFC0502607)
贵州省科技计划重大专项(黔科合重大专项字[2014]6007号)
贵州师范大学研究生创新基金项目(研创201518)
关键词
石漠化
洞穴
漏失水土
理化性质
rocky desertification
cave
leakage water and soil
physicochemical property
