Forest Ecosystem Monitoring Cooperative(802) 656-0683femc@uvm.eduwww.uvm.edu/femc705 Spear StreetSouth BurlingtonVermont05403United States of AmericaFoliar Nitrogen Variability and Resorption During Autumn Leaf Senescence in Sugar MapleMeasure foliar nitrogen of sugar maple to determine relationships between leaf nitrogen content and resorption efficiency during autumn leaf senescence. To examine the variability in resorption efficiency among and within sugar maple trees. To establish a baseline for long-term nutrient cycling research. To examine the variability in resorption efficiency and foliar N content among and within sugar maple trees. To determine the relationship between resorption efficiency and foliar N content.Foliar Nitrogen Variability and Resorption During Autumn Leaf Senescence in Sugar MapleScherbatskoyTimLeonEvelineplant physiologyfoliar nitrogennutrient cyclingsugar mapleNitrogen Content in Green Sugar Maple Leaves1993-07-191993-08-12Measurement of pear thrips damage, leaf litter weight, percent nitrogen using 20 trees and one soil sample plot To determine relationships between leaf nitrogen content and resorption efficiency during autumn leaf senescence, examine the variability in resorption efficiency among and within sugar maple trees, and establish a baseline for long-term nutrient cycling research examine the variability in resorptioZ0015_SMLL_GreenVMC.15.15mySQLEveline Leon. 1993. Nitrogen Content in Green Sugar Maple Leaves. University of Vermont. FEMC. Can be found at: https://www.uvm.edu/femc/data/archive/project/foliar-nitrogen-variability-resorption-during-autumn/dataset/nitrogen-content-green-sugar-maple-leaveshttps://www.uvm.edu/femc/CI4/data/archive/project/foliar-nitrogen-variability-resorption-during-autumn/dataset/nitrogen-content-green-sugar-maple-leavesIDIDSite IdtextTreeNumberTree NumberNumber assigned to identify treeintdimensionless1integerdatesSample DateDate sample was collecteddatetimeYYYY-MM-DDLocationTree Sample LocationLocation of sample collection in tree textLNlower canopy on north side of treeLSlower canopy on south side of treeMNmiddle canopy north side of treeMSmiddle canopy south side of treeUNupper canopy north side of treeUSuppers canopy south side of treeAreaCM2Area Area of leaf surfacedecimalsquareCentimeters0.01realThripsThrips Damage IndexAll green leaf samples were assigned a pear thrips damage index numberintdimensionless1integerdrywt_gDry WeightWeight of leaves or lead litter oven dried at 70 degrees Celsiusdecimalgram0.01realCHN_analysisWT_ugCHN weightWeight determined by CHN elemental analyzer (weight of leaf of leaf litter sample)intmicrogram10realPercentage_NPercent NitrogenPercent nitrogendecimalpercent0.01realQC_adjustQC AdjustQC adjustmenttextug_N_cm2ug N/cm^2Micrograms of nitrogen per centimeter squared: the amount of nitrogen found in a given areadecimalsquareCentimeters0.000000001realaverage_ug_N_cm2Average ug N/cm^2Mean micrograms of nitrogen per centimeter squared for all sample sites in a tree decimalsquareCentimeters0.001realMG_Ngmg N/gMilligrams nitrogen per gramdecimalnanogram0.0001real