Gas Exchange and Productivity in Temperate and Droughty Years of Four Eastern, Elite Loblolly Pine Genotypes Grown in the Western Gulf Region

Table 1

Tests of fixed effects of leaf-level and crown-level (Crn) photosynthetic capacity (A_sat), conductance (), and intrinsic use efficiency (iWUE) in previous-year (PY) and current-year (CY) foliage flushes as well as foliage area (FA) and biomass partitioning parameters (foliage : branch mass, branch : stem mass, foliage mass, branch mass, stem mass, branch diameter, branch length, branch angle, taproot weight, fine: total root mass, and small : total root mass) of four loblolly pine genotypes in North Central Louisiana, USA.

	Genotype		Date/flush		Genotype × date/flush
Parameter	df		df		df
PY-Asat 2009	3	0.439	2	<0.0001	6	0.005
CY-Asat 2009	3	0.031	2	<0.0001	6	0.012
PY-Asat 2010	3	0.802	3	<0.0001	9	0.044
CY-Asat 2010	3	0.553	2	<0.0001	6	0.046
PY-gs 2009	3	0.255	2	<0.0001	6	0.047
CY-gs 2009	3	0.438	2	<0.0001	6	0.098
PY-gs 2010	3	0.897	3	<0.0001	9	0.041
CY-gs 2010	3	0.2007	2	<0.0001	6	0.010
PY-iWUE 2009	3	0.994	2	<0.0001	6	0.999
CY-iWUE 2009	3	0.332	2	<0.0001	6	0.244
PY-iWUE 2010	3	0.815	2	<0.0001	6	0.598
CY-iWUE 2010	3	0.337	2	<0.0001	6	0.268
Crn-FA 2009	3	0.0002	1	<0.0001	3	0.010
Crn-Asat 2009	3	0.974	1	0.912	3	0.001
Crn-gs 2009	3	0.216	1	0.0001	3	0.001
Crn-iWUE 2009	3	0.086	1	0.104	3	0.045
PY-CrnAsat 2010	3	0.013	3	<0.0001	9	0.859
CY-CrnAsat 2010	3	0.019	2	<0.0001	6	0.806
PY-Crngs 2010	3	<0.0001	3	<0.0001	9	0.097
CY-Crngs 2010	3	<0.0001	2	<0.0001	6	0.155
PY-CrniWUE 2010	3	0.493	3	<0.0001	9	0.986
CY-CrniWUE 2010	3	0.897	2	<0.0001	6	0.642
Foliage: branch	3	0.020
Branch: stem	3	0.020
Foliage mass	3	0.063
Branch mass	3	0.030
Stem mass	3	0.187
Branch dia.	3	0.021
Branch angle	3	0.012
Branch length	3	0.151
Taproot wt.	3	0.045
Fine: total	3	0.040
Small: total	3	0.004

For each parameter, degrees of freedom (df) and probability of a greater F (P) are provided. Fixed effects for leaf-level parameters are genotype, date, and genotype × date; for crown-level parameters in 2009 fixed effects are genotype, foliage flush, and genotype × flush; for biomass partitioning parameters, the fixed effect is genotype.