Response of cave air CO2 and drip water to brush clearingin central Texas Implications for recharge and soil CO2 dynamics洞穴空气CO2和滴水对毛刷清除的响应 德克萨斯中部：补给和土壤CO2动态的影响

《Response of cave air CO2 and drip water to brush clearingin central Texas Implications for recharge and soil CO2 dynamics洞穴空气CO2和滴水对毛刷清除的响应 德克萨斯中部：补给和土壤CO2动态的影响》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、JOURNALOFGEOPHYSICALRESEARCH,VOL.115,G04018,doi:10.1029/2010JG001301,2010ResponseofcaveairCO2anddripwatertobrushclearingincentralTexas:ImplicationsforrechargeandsoilCO2dynamics11CorinneWongandJayL.BannerReceived20January2010;revised28April2010;accept

2、ed17June2010;published6November2010.[1]Brushremovaliscommonlyconductedtoincreasewateravailabilityinaridareas,suchascentralTexas,wherewaterresourcesarestressed.Theeffectivenessofbrushclearingtoenhancerecharge,however,remainsuncertainasnumerousstudiesh

3、aveyieldedcontradictoryresults.ThisstudyassessestheeffectsofbrushclearingonrechargetoacaveatNaturalBridgeCaverns,centralTexasbyevaluatingchangesindriprate,dripwatercompositions,caveairCO2concentrations,andcalcitegrowthinacaveunderlyinganareaclearedof

4、brush.Dripsitesweremonitoredfor3yearspreclearingand2yearspostclearingatfivedripsitesbeneathandsevendripsitesnotbeneaththesurfaceclearedofbrush.Physicalandchemicaldripwaterparametersexhibitpreclearingandpostclearingvariability.Postclearingdripratechar

5、acteristicsreflectaninitialintervalofanomalouslyheavyrainfall,thenalongerdryperiod.Drip8786waterSr/Srvaluesdonotexhibitpreclearingtopostclearingvariationatsitesbeneaththeclearedareaandindicatenochangeinpostclearingwaterresidencetime.Significantdecrea

6、sesinpostclearingcaveairCO2areobservedatsevenofninedripsitesinthecavebeneaththeclearing.DecreasesincaveairCO2influencecalcitegrowth,whichimpactspostclearingdripwaterMg/CaandSr/Ca.DecreasesincaveairCO2immediatelyfollowingbrushclearingsuggestthatasigni

7、ficantportionofsoilCO2respirationisfromtreerootrespirationratherthanfromsoilmicrobialactivity.Seasonalcalcitegrowthpatterns,linkedtocaveairCO2,alsoexhibitvariabilitypostclearingandsuggestthatcavemineraldepositsmayrecordhistoricalchangesinvegetativeco

8、ver.Citation:Wong,C.,andJ.L.Banner(2010),ResponseofcaveairCO2anddripwatertobrushclearingincentralTexas:ImplicationsforrechargeandsoilCO2dynamics,J.Geophys.Res.,115,G04018,doi:10.1029/2010JG001301.1.Introduction[3]BrushclearingstudiesinTexashaveinvest