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

Table 2

Light-saturated photosynthesis (A_sat; µmol·m⁻²·s⁻¹) of previous- and current-year foliage of loblolly pine genotypes at a site in North Central Louisiana in 2009 (temperate year) and 2010 (droughty year).

	2009				2010
	April	June	August	November	May	June	August	September
Previous year
HS756	5.132^a	3.725^b	5.918^a	—	4.792^a	1.625^a	0.596^a	0.206^b
HS8103	4.723^ab	4.788^a	5.507^a	—	5.182^a	1.404^a	0.554^a	0.562^a
V9	4.940^ab	3.482^b	5.627^a	—	4.682^a	1.776^a	0.671^a	0.325^ab
V93	3.888^b	4.226^ab	5.965^a	—	4.387^a	1.856^a	0.614^a	0.252^ab
Current year
HS756	—	4.567^b	6.503^a	5.436^a	—	3.127^a	1.744^a	0.371^ab
HS8103	—	5.620^a	6.059^a	5.697^a	—	3.001^a	1.650^a	0.625^a
V9	—	4.471^b	6.205^a	5.158^a	—	3.228^a	1.567^a	0.382^ab
V93	—	5.454^ab	6.203^a	5.415^a	—	3.401^a	1.549^a	0.227^b

For each foliage flush, means within a column followed by different letters are different at .