High-resolution stalagmite δ^(13)C record of soil processes from southwestern China during the early MIS 3  

作　　者：LIU DianBing WANG YongJin CHENG Hai EDWARDS R L 

机构地区：[1]College of Geography Science,Nanjing Normal University [2]Institute of Global Environmental Change,Xi'an Jiaotong University [3]Department of Geology and Geophysics,University of Minnesota,Minneapolis

出　　处：《Science China(Technological Sciences)》2013年第3期796-802,共7页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(41172148and41130210);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

摘　　要：Knowledge of the evolution of pedogenic processes in the carbonate area is important to understand the dynamics of rock desertification.A precisely-dated stalagmite δ13C record between 61.3 and 50.5 ka BP from southwestern China,potentially related to soil biogenic CO2 production,shifts within a narrow range between -9‰ and -7‰,and exhibits a prominent cycle of 350-470 a,independent of the Asian monsoon changes.This indicates that a threshold effect might control the amplitude of calcite δ13C variability,likely associated with the vertical soil loss in the carbonate area.The periodic δ13C changes reflect that the loss/recovery of soil cover can operate on centennial scale.Thus,the rock desertification in southwestern China might at least initiate 60 ka ago and should be of natural origin.

关 键 词：Wulu Cave STALAGMITES stable carbon isotope centennial changes soil processes 

分 类 号：P532[天文地球—古生物学与地层学] S158[天文地球—地质学]