Applying Dendrochronology in Environmental Studies of Effects of Nitrogen Deposition on Forest Productivity Paul R. Sheppard.

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Presentation transcript:

Applying Dendrochronology in Environmental Studies of Effects of Nitrogen Deposition on Forest Productivity Paul R. Sheppard

Perturbations in N Cycle Natural fixation: 140 Human fixation: 140 –Mostly fertilizers –Then legumes –Plus cars, factories Essential fact: N fixation is doubled now

N Deposition Not Equal Globally

Nitrogen Saturation Too much of a good thing is not a good thing Nutrient imbalances –Plant growth decline Nitrate leaching into drinking water Trace gas emissions Not certain of the impact of the grand N perturbation on forest productivity

Dendro-Soils Field Methods Collect tree cores as usual Collect soils data for each tree –Whole soil samples –Nutrient availability from IER Careful mapping of trees within site Normal physiographic information Associate tree growth trends with soil/geomorphic properties, N

Field Use of Resins Bury in root zone –How many per tree? –Distance from trunk? –Depth? –Rocks! Working on this now Key point: like root absorption of nutrients

Dendro Environmental N Studies Sites with sluggish natural N cycling Along a steep gradient of N deposition SoCal/Baja: –Old trees –Subalpine sites –Poor soils –Huge N gradient

On a Clear Day in San Gorgonio

Not Much Better Over San Jacinto

San Jacinto Chronologies

One-way ANOVA: s versus hllslp5 Analysis of Variance for s Source DF SS MS F P hllslp Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev flats ( * ) 2toeslp ( * ) 3midslp (---*---) 4shldr ( * ) 5sumsad ( * ) Pooled StDev =

One-way ANOVA: s versus midslopes Analysis of Variance for s Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop ( *------) 2others ( * ) Pooled StDev =

One-way ANOVA: s versus mislopetoe Analysis of Variance for s Source DF SS MS F P mislopet Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop (----*-----) 2others ( * ) Pooled StDev =

One-way ANOVA: NO3-N versus midslopes Analysis of Variance for NO3-N Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop ( * ) 2others ( * ) Pooled StDev =

One-way ANOVA: NH4-N versus midslopes Analysis of Variance for NH4-N Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop ( * ) 2others ( * ) Pooled StDev =

One-way ANOVA: K versus midslopes Analysis of Variance for K Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop ( * ) 2others ( * ) Pooled StDev =

One-way ANOVA: Ca versus midslopes Analysis of Variance for Ca Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop (-----*------) 2others ( * ) Pooled StDev =

One-way ANOVA: Mg versus midslopes Analysis of Variance for Mg Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop (------*------) 2others ( * ) Pooled StDev =

One-way ANOVA: Na versus midslopes Analysis of Variance for Na Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop ( * ) 2others ( * ) Pooled StDev =

One-way ANOVA: IER NO3-N versus midslopes Analysis of Variance for IER NO3- Source DF SS MS F P midslope Error Total Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev midslop ( * ) 2others ( * ) Pooled StDev =

Conclusions Site selection Tree selection Ring-width processing Soil measurements Site chronologies have internal variability