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湖南大龙洞流域不同岩性不同土地利用类型条件下碳酸盐岩试片的溶蚀速率
引用本文:王文娟,蓝芙宁,蒋忠诚,覃小群,劳文科.湖南大龙洞流域不同岩性不同土地利用类型条件下碳酸盐岩试片的溶蚀速率[J].中国岩溶,2013,32(1):29-33.
作者姓名:王文娟  蓝芙宁  蒋忠诚  覃小群  劳文科
作者单位:广西师范学院资源与环境学院;中国地质科学院岩溶地质研究所/国土资源部岩溶生态系统与石漠化治理重点实验室;南京大学生命科学学院;中国地质科学院岩溶地质研究所/国土资源部岩溶生态系统与石漠化治理重点实验室;中国地质科学院岩溶地质研究所/国土资源部岩溶生态系统与石漠化治理重点实验室;中国地质科学院岩溶地质研究所/国土资源部岩溶生态系统与石漠化治理重点实验室;中国地质科学院岩溶地质研究所/国土资源部岩溶生态系统与石漠化治理重点实验室
基金项目:国家“十二五”科技支撑计划课题(2010BAE00739-02);中国地质调查局地质调查项目(水[2013]02-013-002);中国地质科学院重点实验室开放基金(KERDC201101);中国地质科学院岩溶地质研究所基本科研业务费项目(2010003)
摘    要:选择湖南大龙洞流域寒武系中统熬溪组上段(∈2a3)白云岩、寒武系上统比条组下段(∈2α3)和奥陶系中统牯牛潭组(O2g)灰岩进行野外溶蚀试验,并测试林地和草地类型土壤剖面20cm、50cm深度土壤COz浓度和有机质含量,以探讨林地、草地土地利用类型条件下试片溶蚀速率的差异特征。结果表明:(1)O2g、∈3b1和∈2a3 3种试片溶蚀速率在林地和草地土下20CITI、50ClTI深度差异明显,∈3b1g灰岩林地土下20CITI试片的溶蚀速率最大,达357.93mg/(m2·d);(2)试片溶蚀速率受岩性影响明显,CaO含量高。溶蚀速率大,O2g、∈3b1灰岩中CaO含量分别为35.38%、47.45%,较∈2a3白云岩的含量32.64%高,因而其溶蚀速率也较∈2a3的大;(3)埋放于林地土壤的试片其溶蚀速率大干草地,表明土地类型对溶蚀速率有较大的影响,植被从草地向林地的正向演替有利于岩溶作用的进行。

关 键 词:土壤CO2浓度  有机质含量  岩性  土地利用类型
收稿时间:2012/10/26 0:00:00

Corrosion rate of carbonate tablet under diverse land use and lithology in the Dalongdong basin, Hunan
WANG Wen juan,LAN Fu ning,JIANG Zhong cheng,QIN Xiao qun and LAO Wen ke.Corrosion rate of carbonate tablet under diverse land use and lithology in the Dalongdong basin, Hunan[J].Carsologica Sinica,2013,32(1):29-33.
Authors:WANG Wen juan  LAN Fu ning  JIANG Zhong cheng  QIN Xiao qun and LAO Wen ke
Institution:1.Faculty of Resources and Environmental Science,Guangxi Teachers Education University,Nanning,Guangxi 530001,China; 2.Institute of Karst Geology/Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification,CAGS,Guilin,Guangxi 541004,China)
Abstract:In order to discuss the differences of corrosion rates between the forestland and the grassland, tab- lets made of the Aoxi group dolomite( E zaa) and the Bitiao group limestone( ∈3b) as well as the Guniutan group lirnestone(O2g)are used to test the s0il CO2 concentration and organic content at 20 cm and 50 cm deep on soil profile in the Dalongdong basin, Hunan. It is concluded that, (1) the corrosion rates among the three tablets are quite different both under the forestland and the grassland at 20 cm and 50 cm deep on the soil profile with the ∈3b1g tablet the largest; (2) corrosion rates are affected obviously by lithology, the higher the CaO content the larger the corrosion rate, so the fewest the ∈3a3 tablet in CaO content(32.64 %), the smallest the corrosion rate of the C2aa tablet; (3) the corrosion rate is larger under forestland than that un- der grassland, which proving the land type is of effect on corrosion rate. It will be benefit to karstification if the vegetation successes consequently towards forest from grass.
Keywords:concentration of soil CO2  content of soil organism  lithology  land use type
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