Table 1.
Chemical compositions of 3-year-old and 12-year-old woody crop branchesa

Composition	P. nigra × P. maxiwiczii	P. euramericana	P. alba × P. glandulosa	S. alba
3-year-old woody crop branches
Extractive	8.7 ± 0.2	6.5 ± 0.1	8.6 ± 0.1	9.6 ± 0.4
Cellulose as glucose	44.2 ± 0.6	46.0 ± 0.8	48.6 ± 0.8	44.1 ± 0.5
Hemicellulose as	18.1	18.9	19.9	18.0
Xylose	14.1 ± 0.5	14.7 ± 0.2	15.5 ± 0.4	14.0 ± 0.4
Galactose	1.0 ± 0.4	2.1 ± 0.2	2.2 ± 0.1	2.0 ± 0.2
Arabinose	2.0 ± 0.1	1.0 ± 0.1	1.1 ± 0.1	1.0 ± 0.1
Mannose	1.0 ± 0.1	1.1 ± 0.2	1.1 ± 0.1	1.0 ± 0.2
Acid insoluble lignin	25.7 ± 0.8	25.9 ± 0.7	20.6 ± 0.8	25.2 ± 0.4
Acid soluble lignin	1.1 ± 0.2	0.6 ± 0.1	0.8 ± 0.4	0.9 ± 0.1
Ash	1.1 ± 0.1	2.0 ± 0.3	1.1 ± 0.1	1.4 ± 0.1
12-year-old woody crop branches
Extractive	7.0 ± 0.6	6.2 ± 0.5	5.8 ± 0.5	4.6 ± 0.2
Cellulose as glucose	46.9 ± 0.5	47.3 ± 0.9	47.3 ± 0.8	45.4 ± 0.6
Hemicellulose as	20.2	19.5	19.5	18.6
Xylose	15.9 ± 0.4	15.1 ± 0.4	15.1 ± 0.7	14.5 ± 0.4
Galactose	2.1 ± 0.3	1.1 ± 0.3	1.1 ± 0.5	2.1 ± 0.4
Arabinose	1.1 ± 0.1	2.2 ± 0.1	2.2 ± 0.2	1.0 ± 0.4
Mannose	1.1 ± 0.2	1.1 ± 0.1	1.1 ± 0.2	1.0 ± 0.1
Acid insoluble lignin	23.0 ± 0.7	22.7 ± 0.5	22.2 ± 0.5	26.0 ± 0.6
Acid soluble lignin	1.2 ± 0.4	0.9 ± 0.3	1.3 ± 0.3	1.8 ± 0.4
Ash	1.2 ± 0.2	1.7 ± 0.1	1.2 ± 0.1	1.5 ± 0.1

Data in the table are based on oven-dried samples.