針闊混交林次生演替階段土壤營養(yǎng)元素遷移對比分析研究.pdf

1、東北師范大學碩士學位論文針闊混交林次生演替階段土壤營養(yǎng)元素遷移對比分析研究姓名：劉佳雪申請學位級別：碩士專業(yè)：自然地理學指導教師：劉惠清20050501AbstractThisstudyappliedtothemethodofthatusingthespecialseriesreplacingthetimingseries，basedonthesoilformationtheorytherelationshipbetweenthesoi

2、lnutritioncycleandtheforestlitterinthesecondarysuccessionofthetemperatebroadleavedconiferOUsmixedforestwasstudied，inordertobuilduptheoryfoundationfortherestorationofthebroadleavedconiferousmixedforestlandscapeThestudyare

3、alocatedinZhuojiatownjilinprovince，fivesecondarysuccessionstages，fromtheweedcommunitytothemixbroadleavedforestcommunityofthetemperatebroadleavedconiferousmixedforestwasinvestigatedandanalysed，theresultsareasfollows：Corre

4、lationanalysisindicatesthatthenitrogencontentandphosphorcontentinsoilsignificantlycorrelatedtotheorganicmattercontentSoilorganicmatterincreaseswiththesuccessiondevelopment，whichimprovessoilphysicalandchemicalconditionwit

5、hthesuccessiondeveloping，vegetationchangesfromtheweedcommunityintothebroadleavedmixforestcommunitythenitrogencontent，phosphorcontentandorganicmatterincreasedintheforestlittersChangesofthesoilbulkdensitNsoilqualityandwate

6、rcontentinthedifferentsuccessionstageswasconsistentwiththechangesofthecompositionsandstructuresoftheforestlitterwhichwasoppositetothefeaturesoftheparentalmaterialsWithsuccessionsgettingon，thechangesofsoilphysicalproperty

7、facilitatetothedepositingandreleasingofthesoilnutritionConsequentlysoiltotalnitrogen，activenitrogen，totalphosphoractivephosphorandorganicmatterallshowincreasingtrendThenutritionmigrationbetweentheforestlitterandsoilisreg

8、ularlyitschangesshowalineartrendWiththedevelopmentofsuccession，organicmatterinsoilisofcumulativepropertywhichimprovesthelevelofsoildevelopmentThedifferencebetweenthesuccessionstagesnotonlyrepresentinthevegetabletypeandth

9、especies，moreoversoilformationandphysicalandchemicalfeaturesarea11differentbecauseofthevariabilityofthemigrationbetweentheforestlitterandsoilFilbertshrubandMongolianoakforestcommunityareofhigherproductivityandgrowupquick

10、lybutthestructureoftheirmatureforestissimple，prevailingspeciesoftheecosystemistheFilbertorMongolianoakwhichecosystemprovedtobeephemeral，meanwhile，thequalityofthenutritionprovisionabilityofthemislowerwhichisononesiderelat