أعرض تسجيلة المادة بشكل مبسط
| dc.date |
2006-11-20T23:59:12Z |
|
| dc.date |
2006-11-20T23:59:12Z |
|
| dc.date |
1977 |
|
| dc.date.accessioned |
2013-10-16T07:42:01Z |
|
| dc.date.available |
2013-10-16T07:42:01Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3459 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3459 |
|
| dc.description |
Mountain pine beetle populations began increasing in Glacier
National Park in 1970. Numbers of infested trees increased
steadily from an average of 12 to 115 per hectare from 1972
to 1976. Total hectares of infestation have increased from
445 in 1972 to 40,419 ha in 1976. Predictive equations
estimate a cumulative loss of nearly 3 million trees by
1977. Silvicultural practices to reduce the phloem thickness/
tree diameter distribution in stands are the best
known management alternatives. But because of the National
Park Service policy to permit mortality as part of natural
succession, application of these alternatives is not recommended. |
|
| dc.language |
en_US |
|
| dc.publisher |
Missoula, MT. : Forest Insect & Disease Management, USDA, Forest Service, Northern Region, State & Private Forestry |
|
| dc.relation |
Report (United States. Forest Service. Northern Region) |
|
| dc.relation |
no. 77-4 |
|
| dc.relation |
Forest insect & disease management |
|
| dc.title |
Status of mountain pine beetle infestation, Glacier National Park, 1976 |
|
| dc.type |
Technical Report |
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الملفات في هذه المادة
|
لا توجد أي ملفات مرتبطة بهذه المادة.
|
هذه المادة تبدو في المجموعات التالية:
أعرض تسجيلة المادة بشكل مبسط