❓ A parliamentary question probes the Department of Conservation and Land Management's use of single tree selection logging in jarrah forests, particularly concerning the methodology, extent, and rationale behind its application, especially in relation to dieback disease management.
AnsweredQoN 73Legislative Council
QuestionView source ↗
In the Department of Conservation and Land Management’s Annual Report 1990-2000, a table (page 18) provides a breakdown of the “silvicultural objectives” behind the 1999 logging of 14 200 hectares of jarrah forest. Included in the table is the figure of 590 hectares logged for “single tree selection”. Will the Minister advise -
(1) How a figure in hectares is obtained for single tree selection?
(2) How many trees were felled under this category, or if this is not possible, what volume of timber resulted?
(3) In how many forest blocks, and in how many coupes within each block, single tree selection was used -
(a) with other silvicultural prescriptions;
(b) as the sole silvicultural prescription?
(4) Precisely what silvicultural outcome is expected from single tree selection?
(5) What is the basis for single tree selection rather than other management techniques?
(1) How a figure in hectares is obtained for single tree selection?
(2) How many trees were felled under this category, or if this is not possible, what volume of timber resulted?
(3) In how many forest blocks, and in how many coupes within each block, single tree selection was used -
(a) with other silvicultural prescriptions;
(b) as the sole silvicultural prescription?
(4) Precisely what silvicultural outcome is expected from single tree selection?
(5) What is the basis for single tree selection rather than other management techniques?
AnswerView source ↗
Answered
31 July 2001
Responded by
Minister for Forestry and Fisheries
Response time
42 days
(b) as the sole silvicultural prescription?
2. It is not possible to accurately determine the total number of trees or volume of timber removed by this individual category. Volumes are recorded on the basis of operational areas that may include more than one silvicultural objective. 3. (a) Single tree selection was used with other silvicultural objectives in 13 coupes within 11 forest blocks. (b) There were no coupes in which single tree selection was the sole objective 4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
3. (a) Single tree selection was used with other silvicultural objectives in 13 coupes within 11 forest blocks. (b) There were no coupes in which single tree selection was the sole objective 4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
(b) There were no coupes in which single tree selection was the sole objective 4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
2. It is not possible to accurately determine the total number of trees or volume of timber removed by this individual category. Volumes are recorded on the basis of operational areas that may include more than one silvicultural objective. 3. (a) Single tree selection was used with other silvicultural objectives in 13 coupes within 11 forest blocks. (b) There were no coupes in which single tree selection was the sole objective 4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
3. (a) Single tree selection was used with other silvicultural objectives in 13 coupes within 11 forest blocks. (b) There were no coupes in which single tree selection was the sole objective 4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
(b) There were no coupes in which single tree selection was the sole objective 4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
4 and 5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
5. Single tree selection is applied in those areas of the jarrah forest in the Swan and Central Forest Regions that are infested with Phytophthora cinnamomi (dieback disease). In these areas the objective is to maintain a forest cover of healthy trees following the harvesting and to minimise the potential escalation of disease impact. In many instances the application of this guideline basically results in a thinning of the forest, although the retained trees do not necessarily meet potential sawlog standards.
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