Results - Stocking, Height, Diameter, Mean Tree Volume, Forking and Erectness

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For detailed results please refer to the complete report 2004 Elite Cypress Forestry Trial

Stocking

There was no significant difference in the stocking between the varieties at age five. The average stocking was 774 stems/ha, which is a survival rate at age five of 94 percent.

Height, Diameter and Mean Tree Volume

Height, diameter (DBH) and Mean Tree Volume are related assessments. There was no significant difference in DBH or Mean Tree Volume due to large variance within cultivars. There was a significant difference in height (P = 5.0x10-5). Ovensii was the tallest cultivar with a mean height of 5.27 m. At 3.26 m, SC2 was significantly shorter than the rest of the varieties (Figure 1).

Forking

There was a significant difference in forking (P=0.003). Ovensii is the least likely to fork, often with no fork or forks only in the top quarter of the stem. The hybrids had the least propensity to fork of all of the cultivars (Figure 1).

Erectness

There was a significant difference in erectness (P=9.9x10-7). A large proportion of SC2 and Hycol had low erectness scores (Figure 1) because a large proportion of trees were leaning greater than 15 degrees and very few trees vertical. All other varieties were erect and suitable for timber production.

Cypress Trial Chart of Height, Forking and Erectness

Figure 1 Comparison of the eight cypress cultivars with respect to tree height, in metres; forking rank, where a rank of 5 indicates no forking; and erectness rank, where a rank of 5 indicates a perfectly vertical stem.

SC2 lying prostate and an example of a leaning Hycol with numerous large bends

Figure 2 SC2 lying prostate compared with Cupresses macrocarpa in the plot behind in the image on the left.

Figure 3 An example of a leaning Hycol with numerous large bends in the image on the right. 

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