Aspen Bibliography

Title

Effects of carbon, fertilizer, and drought on foliar chemistry of tree species in interior Alaska

Document Type

Article

Journal/Book Title/Conference

Ecological Applications

Volume

6

Issue

3

First Page

815

Last Page

827

Publication Date

1996

Abstract

Changes in foliarchemistryresultingfromchanges in forest-flooarnd min- eral-soilmoistureavailability,forest-floomricrobialenergysupply,andnitrogenavailability wereinvestigatedacross thesuccessional sequences in bothuplandand floodplainlandscape positions.Three amendments,sugar,sawdust,and nitrogenfertilizer(NH4NO3),were ap- plied to a series of threeupland and fourfloodplainsuccessional sites. The sugar and sawdusttreatmentwseredesignedtoincreasethecarbon:nitrogenratio(C/N)oftheforest floorto values typicalof black spruce sites (C/N = 50). The nitrogenfertilizertreatment was designed to equal estimatedyearlyN mineralizationin an attempto double available nitrogenin the forestfloor.A moistureexclusion treatmentwas designed to remove all summerrainfallfromthe treatmenptlots.

Foliarphosphorusconcentrationwserehigherintheuplandsitesthanonthefloodplain. No consistentdifferenceswerereportedamongsuccessionalstageswithina landscapeunit. Theeffectofeithersugarorsawdusttreatmenwtastodecreasefoliarphosphorusconcen- trations.Sugar produced more significantdifferencesthan did sawdust. Sugar treatments decreased foliarnitrogenin all treespecies except forwhitespruce,while fertilizertended to increasefoliarnitrogenI.n thesecond yearfollowingtreatmentherewas notan increase in foliarnitrogenconcentrationresultingfromfertilizertreatment.