❓ Hon Paul Llewellyn asks about maximum tree root depths for specific eucalypt species in WA, seeking data from CALM and FPC. The Minister's response indicates a lack of direct measurement studies for Salmon Gum and bronze barked gimlets, but provides an estimated root depth for mallees based on soil moisture analysis.
AnsweredQoN 3649Legislative Council
QuestionView source ↗
I refer to a booklet which I understand was prepared by Ian Kealley from the Department of Conservation and Land Management (CALM) and Mandy Clews titled ‘Specialty Timbers of the Goldfields’, a journal of hydrology paper dated 1983 titled ‘The Use of Natural Tracers as indicators of soil water movement in a temperate semi-arid region’ and a journal paper dated August 2002 titled ‘Recharge reduction on degraded agricultural soils with agroforestry systems’ -
(1) Can the Minister state what is the maximum tree root depth including the tap root that has been identified by CALM and the Forest Products Commission (FPC) for Salmon Gum Eucalypts in both the Eastern Goldfields area and the south west of Western Australia?
(2) If no to (1), why not?
(3) Can the Minister state what is the maximum tree root depth including the tap root that has been identified by CALM and the FPC for bronze barked gimlets in both the Eastern Goldfields area and the south west of Western Australia?
(4) If no to (3), why not?
(5) Can the Minister state what is the maximum tree root depth including the tap root that has been identified by CALM and the FPC for Eucalypt mallees in both the Eastern Goldfields area and the south west of Western Australia?
(6) If no to (5), why not?
(1) Can the Minister state what is the maximum tree root depth including the tap root that has been identified by CALM and the Forest Products Commission (FPC) for Salmon Gum Eucalypts in both the Eastern Goldfields area and the south west of Western Australia?
(2) If no to (1), why not?
(3) Can the Minister state what is the maximum tree root depth including the tap root that has been identified by CALM and the FPC for bronze barked gimlets in both the Eastern Goldfields area and the south west of Western Australia?
(4) If no to (3), why not?
(5) Can the Minister state what is the maximum tree root depth including the tap root that has been identified by CALM and the FPC for Eucalypt mallees in both the Eastern Goldfields area and the south west of Western Australia?
(6) If no to (5), why not?
AnswerView source ↗
Answered
22 August 2006
Responded by
Minister for Education and Training representing the Minister for the Environment
Response time
70 days
(2) CALM is not aware of any studies measuring root depth of Salmon Gum eucalypts in the eastern Goldfields or the south west of Western Australia. (3) No. (4) CALM is not aware of any studies measuring root depth of bronze barked gimlets in the eastern Goldfields or the south west of Western Australia. (5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(3) No. (4) CALM is not aware of any studies measuring root depth of bronze barked gimlets in the eastern Goldfields or the south west of Western Australia. (5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(4) CALM is not aware of any studies measuring root depth of bronze barked gimlets in the eastern Goldfields or the south west of Western Australia. (5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(6) Not Applicable.
(3) No. (4) CALM is not aware of any studies measuring root depth of bronze barked gimlets in the eastern Goldfields or the south west of Western Australia. (5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(4) CALM is not aware of any studies measuring root depth of bronze barked gimlets in the eastern Goldfields or the south west of Western Australia. (5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(5) 10 metres, for seven year old mallees, as identified in the conference paper "Recharge reduction on degraded agricultural soils with agroforestry systems". It should be noted that in this study root depth was not measured directly but was estimated using soil moisture content and matric potential profiles. (6) Not Applicable.
(6) Not Applicable.
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