أعرض تسجيلة المادة بشكل مبسط
| dc.contributor |
Rose, Robert Jr. |
|
| dc.contributor |
Maguire, Douglas |
|
| dc.contributor |
Mallory-Smith, Carol |
|
| dc.contributor |
Stone, Jeff |
|
| dc.date |
2007-07-12T17:32:50Z |
|
| dc.date |
2007-07-12T17:32:50Z |
|
| dc.date |
2007-06-04 |
|
| dc.date |
2007-07-12T17:32:50Z |
|
| dc.date.accessioned |
2013-10-16T07:55:41Z |
|
| dc.date.available |
2013-10-16T07:55:41Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/5917 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/5917 |
|
| dc.description |
Graduation date: 2008 |
|
| dc.description |
Early in the establishment of Pacific Northwest conifer plantations, herbaceous
weeds often decrease seedling growth through competition for soil moisture during the
dry summer months. Critical period studies have reported that reductions in
competitive weed cover are necessary during the initial years of establishment to avoid
reductions in seedling growth. Six herbicide treatment regimes commonly applied
over the first two years of plantation establishment were studied in a randomized block
design to understand Douglas-fir seedling growth response. First season results
demonstrate that seedling growth was improved when competing vegetation cover was
reduced through the regimes examined. Volume growth increased from 5 cm3 in the
untreated control to greater than 20 cm3 when total weed cover was reduced below
10%. Multiple vegetation surveys within a single season revealed that reductions in
total vegetation cover were associated with the treatments and tracked distinct changes
to the species composition of the weed communities that remained in these plots. Soil
moisture and xylem water potential were intensively measured and demonstrated that
the vegetation management regimes utilized in this study improved growing
conditions. While all herbicide regimes in the experiment increased seedling growth
relative to the untreated control, the incorporation of a site preparation spray and a
spring release was the most effective treatment. This regime had a profound impact
on seedling growth, vegetation cover, soil moisture, and xylem water potential during
the initial season of the critical period. |
|
| dc.language |
en_US |
|
| dc.subject |
Douglas-fir |
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| dc.subject |
soil moisture |
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| dc.subject |
xylem water potential |
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| dc.subject |
herbicides |
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| dc.subject |
vegetation management |
|
| dc.title |
Evaluating the effectiveness of commonly used herbaceous weed control regimes in a Pacific Northwest conifer plantation |
|
| dc.type |
Thesis |
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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