Early tree and pasture growth in an agroforestry system evaluating Albizia lebbeck, Casuarina cunninghamiana and Eucalyptus maculata in south-east Queensland
1994
Dunn, G.M. | Taylor, D.W. (Queensland Dept. of Primary Industries, Gympie (Australia). Forest Research Inst.) | Lowe, K.F. | Bowdler, T.M. (Queensland Dept. of Primary Industries, Ipswich (Australia). Forest Research Inst.)
An experiment evaluating Albizia lebbeck, Casuarina cunninghamiana and Eucalyptus maculata at 5 densities amongst a pasture containing Chloris gayana cv. Callide (rhodes grass), Chamaecrista rotundifolia cv. Wynn (Wynn cassia), Stylosanthes scabra cv. Seca (stylo), Lotononis bainesii cv. Miles (lotononis) and Trifolium repens cv. Haifa (White clover) was established in south-east Queensland in 1990. The 5 planting densities (78, 182, 343, 771 and 1189 stems per ha) were replicated on lower, mid-and upper slope positions. Over the first 3 years, C. cunninghamiana (mean height 5.5 m) grew significantly faster than E. maculata (4.3 m), which, in turn, grew significantly faster than A. lebbeck (2.6 m). Due to its poor growth and a mortality rate of 12.3 percent, A. lebbeck was considered poorly suited to the site. The heights of the 3 species were not significantly affected by planting density or position on the slope. Stem diameter at 1.3 m (DBH), measured for 3-year-old C. cunninghamiana only, peaked at 343 stems per ha. The DBHs of mid- and lower slope trees were similar and significantly greater, by 17.4 percent, than those of upper slope trees. During the third year after establishment, median pasture yield was significantly increased under the highest 2 density treatments of A. lebbeck and E. maculata when compared with the other density treatments
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