Vector Analysis: Does it really predict growth response? Mariann Johnston, SUNY-ESF Ranger School.

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Presentation transcript:

Vector Analysis: Does it really predict growth response? Mariann Johnston, SUNY-ESF Ranger School

Shoestring Satellite Experiment: The Adirondack Screening Trials Individual tree fertilization trials James F. Dubuar Memorial Forest, Adirondack Park 2 Species Sugar maple (dom/codom, ~30 cm dbh) Am. beech (intermediate, ~10 cm dbh) 6 Treatments screened

Shoestring Satellite Experiment: The Treatments Control N1: 30 N (urea) N1P1: 30 N + 30 P (MAP + urea) N2: 200 N N2P2: 200 N P N2P2KB: 200 N P K + 3 B One-time application Shoestring Project Prelim

Timeline 2010 May: Fertilized, Measured July-Aug: Foliage collected, dried, weighed 2011 Feb-Apr: ICP and C/N analyses July: Vector analyses presented Nov: Remeasurements Today: Two-Year Basal Area Response

Vector Analysis Foliar diagnostic technique Predicts nutrient deficiencies Assumes that foliage response is a predictor of tree yield response Did it work?

Sugar Maple Vector analysis said: Response to N2P2KB will occur N, P, K were deficient

Sugar Maple Growth Response No significant differences between treatments

American Beech Vector analysis said: No growth response to any fertilization treatment will occur

Beech Growth Response p-values:

Conclusions Did vector analysis predict growth response? No, not really (2-yr BA) But... Foliage-damaging spring freeze occurred at time of fertilization Height, volume growth were not analyzed Continue monitoring for future responses

Conclusions Beech responded to fertilization! Intermediate crown class, understory cohort Is beech a nutrient hog? What are the ecological implications?

The End

Graphical Vector Analysis 100 A: Dilution B: No Change Relative Foliage Biomass C: Deficiency D: Luxury Consumption E: Toxicity F: Antagonism

Sugar Maple Growth Mean dbh Yr 0: 34.6 cm Mean dbh Yr 2: 35.0 cm Average BA response of 2.4% No differences between treatments were detected Predicted growth responses not apparent in diameter response

Beech Growth Mean dbh Yr 0: 9.9 cm Mean dbh Yr 2: 10.7 cm Average BA response of 18.1% All treatments showed significant (p < 0.05) growth compared to control except for N2 (200 kg N)