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>Potential of two tree shelters to aid the early establishment and growth of three Australian tree species on the Darling Downs, south-east Queensland
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Potential of two tree shelters to aid the early establishment and growth of three Australian tree species on the Darling Downs, south-east Queensland
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机译：Potential of two tree shelters to aid the early establishment and growth of three Australian tree species on the Darling Downs, south-east Queensland
The ability of the commercial tree shelter Growtube#xAE; and a perforated sheet metal shelter (Mauri) to improve the growth and survival of seedlings ofCasuarina cristata, Eucalyptus moluccana and Melaleuca linariifoliawas tested on the Darling Downs in south-east Queensland. The 0.9 m high tree shelters were removed after 2 years and at this time tree survival was unaffected by shelter type for all 3 species. Over a 44-month period, neither shelter improved the height growth ofC. cristataorE. moluccana.Growtubes significantly (P 0.05) increased the height ofM. linariifoliaand, at the time of shelter removal, trees in Growtubes were 23 taller than control trees. Differences in height decreased after the Growtubes were removed and 18 months later were no longer significant (P 0.05). The early deterioration of the growtubes would have decreased their ability to create a beneficial microclimate, leading to the absence of any height increases forC. cristataandE. moluccanaand small and non-persistent height increases forM. linariifolia.Thus, Growtubes were considered unsuitable for the environment in which they were tested. The cost of establishing a tree without a tree shelter, with a Mauri tree shelter and with a Growtube tree shelter was estimated to be $1.82, $3.08 and $5.12, respectively. During the first two years, a further $1.79 per tree was spent on materials used to replace damaged Growtubes.
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