凋落物中的有機(jī)酸及其對森林土壤的磷釋放效應(yīng).pdf

1、東北林業(yè)大學(xué)碩士學(xué)位論文凋落物中的有機(jī)酸及其對森林土壤的磷釋放效應(yīng)姓名：宋金鳳申請學(xué)位級別：碩士專業(yè)：土壤學(xué)指導(dǎo)教師：崔曉陽陳立新20030601AbstractBasedonthemainkindsontreesinthenorthpartofChina，suchasLarch∞arixdahurica)Manchurian(Fraxinusmandshurica)，Koreanpine(Pinuskoraiens渤andWhiteb

2、irch(Betulaplatyphylla)andDarkBrownForestSollwhichiSamaximumzonalsoilinareaquantitativeandqualitativeanalysisoforganicacidsinthefourkindsoftrees’LiittersandmoredecomposedFIittersweredonebyGasChromatogramsystemAtthesalnet

3、ime，theeffectofinsolublePhosphorusnutrientonDarkBrownForestSoilcausedbyOxalicacidpresentinginallliaersdominantlywasstudiedTheresultsareasfollows：First，稍∞methodusedinthispapertoseparateandidenti母organicacidsintheforestlit

4、tersbyGasChromatogram(GC)systemisareliableandconvenientmethod曩艟Recoveriesofthirteenorganicacidsdetectedrangedfrom7466％艷87。45％withCoemcientⅥlriationfrom153％to854％1飛esedatashowedthatthemethodaccordedwiththeanalyzingdemandS

5、econd。OrganicacidswerepresentintheforestlitterscomprehensivelyAstoLlittersofallsamplesOxalicacidwasmaximuminthesevenLow—molecularweightorganicacidsanditsamountsalwayswereabove30mg／g，andOleicacidorLinoleicacidwasmaximumin

6、sixfattyacids，above40mg／g，ToFlitters，OxalicacidwasmaximumnextiSLinoleicacidandoleicacidrespectivelyina11theorganicacidsdetected。Asforthesalnekindsoftree。amoun豁oforganicacidsinLlitterswereobviouslyhigherthanthoseinFlitter

7、sThirdCIxalicacidcouldobviouslycontributetophosphorusreleaseinDarkBrownForestSoilAlhorizon，andamoun毽ofphosphorusreleaserosewiththerisingofconcentrationsofOxalicacidWhat’SmoreamountsofphosphorusreleasecausedbvOxalicacidin

8、BhorizonwerelowerdistinctlythanthoseinAlhorizonAstoDarkBrownForestSoil，thepercentofphosphorusactivationcausedby0xalicacidanionwerehigherthantheeffectofsolvingofacidForth，Activationofphosphoruscausedbyorganicacidcouldbead

9、dedup。AmountsofphosphorusreleaseweredecidedbyLoadingAmountsof0xalicaciddominantlyanddidn’thavemuchsomethingtodowithaddingpatternsofOxalicacidRegressionequationofamounmofPhosphorusrelease≤y)andCxalicacidLoading(x1wasY=000

10、08x‘02125x，andCorrelationcoefficientwas09919Fifth，basedontheRegressionequationmentionedabove，amountsofphosl：IhoruSreleasecausedbyOxalicacidinLandFlitterswereestimate文itsquantitywasabout2085kg／hm‘yrandaccountedforoneinthi