Silva Fennica

Fig. 1. Sites collection of Eucalyptus grandis discs samples. Africa (1a), Mozambique (1b), and Manica district boundaries highlighted (1c). The full black dots indicate discs’ collection site in Bandula plantation and the white dot indicates Penhalonga plantation.

Table 1. Edaphic-climatic characteristics of the Eucalyptus grandis plantation sites. Data relating to geographic location, average temperatures, average cumulative amount of rainfall, elevation and soil typology of the sites.
Species	Age	Provenance	Temperature	Precipitation	Altitude	Soil depth	Soil type
Eucalyptus grandis	7 years	Bandula	24.06 °C	1138 mm	698 m	16.20 cm	Sandy clay franc
	7 years	Penhalonga	22.94°C	1000 mm	813 m	16.00 cm	Sandy clay franc
	9 years	Penhalonga	22.94°C	1000 mm	813 m	22.20 cm	Sandy clay
Sources: Instituto de Investigação Agronómica de Moçambique (1995) [Mozambique Agricultural Research Institute]; MAE (2005); Mina Alumina (2006); WorldClim (2020)

Fig. 2. Scheme of reduction of discs into laboratory test specimens. Sapwood (2a), heartwood (2b), transversal section of prism 20×20 mm (2c), and thickness of the disc (2d).

Table 2. Summary of the mean ash content of Eucalyptus grandis wood. The values in parentheses correspond to the variation coefficients. S1 indicates samples collected at 0.30 m height from the ground, and S2, S3 and S4 samples collected from 25%, 50%, and 75% of the commercial height of the tree, respectively. The data is grouped according to two test sites, two age groups, and two radial positions.
Site	Species	Age	Radial position	Mean ash wood content (%)
Site	Species	Age	Radial position	S1	S2	S3	S4
Bandula	Eucalyptus grandis	7-year	Sapwood	2.11 (3.00)	0.64 (22.31)	0.57 (6.43)	0.78 (4.95)
Bandula	Eucalyptus grandis	7-year	Heartwood	0.33 (23.95)	0.33 (17.39)	0.36 (26.83)	0.34 (22.74)
Penhalonga	Eucalyptus grandis	7-year	Sapwood	0.65 (31.47)	0.49 (12.76)	0.59 (15.56)	0.46 (4.60)
		7-year	Heartwood	0.34 (0.03)	0.15 (51.78)	0.26 (11.67)	0.47 (2.97)
		9-year	Sapwood	0.52 (7.46)	0.35 (10.29)	0.31 (8.52)	0.34 (8.13)
		9-year	Heartwood	0.39 (5.69)	0.31 (9.34)	0.33 (4.51)	0.39 (15.14)

Fig. 3. Effect of radial position on ash content in 7 and 9-year-old Eucalyptus grandis wood. Radial variation of ash content of 7-years-old Bandula samples (3a), 7-year-old (3b), and 9-year-old (3c) both from Penhalonga samples; round symbol stands for the samples extracted at 0.30 m height from the ground, quadrangular symbol for the samples extracted at 25% height, lozenge symbol for the samples extracted at 50% height, and triangular symbol for samples extracted at 75% height, in relation to the commercial length of the stem.

Fig. 4. Variation of ash content at different heights of 7 and 9-year old Eucalyptus grandis stems. 4a: 7-year-old sapwood samples; 4b: 9-year-old sapwood samples; 4c: 7-year-old heartwood samples; 4d: 9-year-old heartwood samples; round symbol stands for the Bandula site and rectangular symbol for the Penhalonga site. View larger in new window/tab.