The hydrologic record of karst systems: linking soil moisture to the carbon isotope signatures of soils above the Blue Spring cave system  

作　　者：Yuchen Liu Jessica L.Oster Jennifer L.Druhan 

机构地区：[1]Department of Geology, University of Illinois Urbana Champaign [2]Department of Earth and Environmental Science, Vanderbilt University

出　　处：《Acta Geochimica》2017年第3期392-395,共4页地球化学学报（英文）

基　　金：supported by the US National Science Foundation, project EAR-1600931

摘　　要：Speleothem carbonates are precipitated continuously from inorganic carbon dissolved in seepage water infiltrating from the land surface,that reflects a mixture of atmospheric CO_2,respired soil carbon,and epikarst sources,each with distinct δ^(13)C values.To aid in deconvolving these signatures,soil samples were collected above the Blue Spring cave system in Sparta,Tennessee,USA and subjected to a series of incubation experiments,in order to constrain the correlation between CO_2respiration rates and soil moisture.This relationship is used to parameterize a simple mixing model which predicts the relationship between δ^(13)C and soil moisture in fluids infiltrating into the underlying cave system.Speleothem carbonates are precipitated continuously from inorganic carbon dissolved in seepage water infiltrating from the land surface,that reflects a mixture of atmospheric CO2,respired soil carbon,and epikarst sources,each with distinct δ^13C values.To aid in deconvolving these signatures,soil samples were collected above the Blue Spring cave system in Sparta,Tennessee,USA and subjected to a series of incubation experiments,in order to constrain the correlation between CO2respiration rates and soil moisture.This relationship is used to parameterize a simple mixing model which predicts the relationship between δ^13C and soil moisture in fluids infiltrating into the underlying cave system.

关 键 词：SPELEOTHEM Δ^13C CO2 respiration Soil moisture 

分 类 号：S151.9[农业科学—土壤学]