Soil N Pools and Transformation Rates Under Different Land Uses in a Subalpine Forest-Grassland Ecotone-中国Betway体育网页登陆

摘要 Soilnitrogenpools(NP),denitrification(DN),grossnitrification(GN),N2OandCO2fluxrateswiththeirresponsestotemperatureincreasesweredeterminedunderfivedifferentlandusesandmanagementsinasubalpineforest-grasslandecotoneoftheeasternTibetanPlateau.Landusesconsistedof1)sparsewoodland,2)shrub-land,3)naturalpasture,4)fencedpasture,and5)tilledpasturemimickingagradientdegeneratingecosystemundergrazingimpacts.TheNO3--NcontentwashigherthantheNH4+-Ncontent.Comparingtilledpasturewithfencedpastureshowedthathigherintensivemanagement(tillage)ledtoasignificantdecreaseofsoilorganicmatter(SOM)(P＜0.05)inthesoils,whichwasincontrasttothesignificantincreases(P＜0.05)ofDN,GN,N2OandCO2fluxrates.GN(excludingtilledpasture)andCO2fluxratesincreasedwithatemperaturerise,butDNandN2Ofluxratesnormallyreachedtheirmaximumvaluesat12-14℃withtilledpasture(thehighestmanagementintensity)beingverysensitivetotemperatureincreases.TherewasadifferencebetweennetnitrificationandGN,withGNbeingabetterindicatorofsoilnitrification.

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Soil N Pools and Transformation Rates Under Different Land Uses in a Subalpine Forest-Grassland Ecotone

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