أعرض تسجيلة المادة بشكل مبسط
| dc.date |
2006-11-07T23:59:23Z |
|
| dc.date |
2006-11-07T23:59:23Z |
|
| dc.date |
1975 |
|
| dc.date.accessioned |
2013-10-16T07:41:39Z |
|
| dc.date.available |
2013-10-16T07:41:39Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3327 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3327 |
|
| dc.description |
The mountain pine beetle infestation has been epidemic in lodgepole
pine in Yellowstone National Park since 1966. Infestation
boundaries have advanced steadily northward and eastward. The
infestation now encompasses nearly one-half of the total Park
area. Surveys indicate a decline in tree mortality the last 2
years. In 1970, an average of 18.9 lodgepole pine was killed per
acre. In 1971, 19.0 were killed per acre. In 1972 and 1973,
these figures declined to 16.7 and 6.6 trees per acre respectively.
Average diameter of attacked trees has decreased from 12.0 inches
d.b.h. in 1971 to 10.0 inches d.b.h. in 1973. A decrease in number
of infested trees occurred in older infestation centers in the
southwest corner of the Park due to depletion of available hosts. |
|
| dc.language |
en_US |
|
| dc.publisher |
Missoula, MT : Forest Environmental Protection, USDA, Forest Service, Northern Region, State & Private Forestry |
|
| dc.relation |
Report (United States. Forest Service. Northern Region) |
|
| dc.relation |
no. 75-4 |
|
| dc.relation |
Forest environmental protection |
|
| dc.title |
Status of mountain pine beetle infestations, Yellowstone National Park, Wyoming, 1973 |
|
| dc.type |
Technical Report |
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الملفات في هذه المادة
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لا توجد أي ملفات مرتبطة بهذه المادة.
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هذه المادة تبدو في المجموعات التالية:
أعرض تسجيلة المادة بشكل مبسط