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Responses And Mechanisms Of Ecosystem Stoichiometry And Litter Decomposition To Nitrogen,Phosphorus And Acid Addition In A Temperate Forest

Posted on:2021-01-13Degree:MasterType:Thesis
Country:ChinaCandidate:Y ShenFull Text:PDF
GTID:2370330611469172Subject:Ecology
Abstract/Summary:PDF Full Text Request
Nitrogen(N)and phosphorus(P)deposition have increased rapidly during the past decades,which likely changes soil N and P availability,soil acidification and ecosystem P limitation.Even though comparing to N deposition,P deposition amount is less,global atmospheric P deposition is aggravating and has getting attention.The soil resource variations induced by N and P deposition will further affect stoichiometry in different ecosystem components and litter decomposition.Meanwhile,soil acidification induced by N enrichment can perturb microbial activity further inhibiting litter decomposition.These processes can combine to affect nutrients cycling in ecosystem.However,at present,researches about above processes and mechanisms are vacant relatively.Based on direct effect(increased soil N availability)and indirect effect(changes in soil P availability)induced by atmospheric N deposition,we established a control experiment with N,P,acid and their interactive addition and deuterogenic litter decomposition study in a temperate forest of Changbai Mountain in northeast China.Our research reveals:(1)different responses and close relationships of elements stoichiometric responses among various ecosystem components in face of N and P enrichment;(2)variation of ecosystem P drives the differences and relationships of stoichiometric responses;(3)acid addition inhibits litter decomposition but N and P addition hardly influence decomposition;(4)microbial activity and litter initial quality are the main factors affecting litter decomposition rate;(5)percentages of remaining N and P increased firstly and then decreased respectively under N addition and P addition,respectively.This study provides new insights into understanding stoichiometric variation under changing environment in a whole ecosystem view and enriches researches of litter decomposition under N deposition and its associated P limitation and soil acidification.All these can facilitate the study of nutrients cycling in ecosystems.
Keywords/Search Tags:N,P and acid addition, Ecosystem components, Nutrients stoichiometry, Litter decomposition, Temperate forest
PDF Full Text Request
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