Ecological Archives E089-148-A3

Sarah E. Hobbie. 2008. Nitrogen effects on litter decomposition: a five-year experiment in eight temperate sites. Ecology 89:2633–2644.

Appendix C. A table showing significance of ANCOVAs of maximum N immobilization by decomposing substrates with site, N-fertilization treatment, and their interaction as main effects and measures of substrate initial carbon and nutrient chemistry as covariates.

TABLE C1. A table showing significance of ANCOVAs of maximum N immobilization by decomposing substrates with site, N-fertilization treatment, and their interaction as main effects and measures of substrate initial carbon and nutrient chemistry as covariates (each covariate was analyzed in a separate ANCOVA). The sign of the relationship between the covariate and decomposition rate is indicated in parentheses. There were no interactions between any covariate and site, fertilization, or their interaction in preliminary analyses (not shown).

Covariate in Analysis

Effect

 

Covariate

Site (S)

N-fertilization (N)

S × N

R2

WS

*** (-)

ns

ns

ns

0.23

NPE

ns

ns

ns

ns

--

AS

*** (+)

ns

ns

ns

0.22

Lignin

* (-)

ns

ns

ns

0.08

N

*** (-)

ns

ns

ns

0.64

P

*** (-)

ns

ns

ns

0.30

K

*** (-)

ns

ns

ns

0.55

Ca

ns

ns

ns

ns

--

Mg

*** (-)

ns

ns

ns

0.26

***P ≤ 0.001, **P ≤ 0.01, *P ≤ 0.05, ns: not significant (P > 0.05)


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