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Filtering by: Committee Member Dilworth, John R.

Effects of herbaceous weed control on young Douglas-fir moisture stress and growth

Creator:

Preest, David Stanley

Abstract:

Profitable, even-aged forest management depends on the early establishment and rapid growth of each new forest crop. These, in turn, require that the young trees have access to an adequate supply of native resources of moisture, nutrients and light. In Mediterranean-type climates, competition for soil moisture is the most serious...

Resource Type:

Dissertation
Summer soil moisture dynamics in a young Douglas-fir plantation as influenced by three herbaceous weed communities

Creator:

Preest, David Stanley

Abstract:

The use of chemicals such as the triazines (especially atrazine) and mixtures of the triazines and 2,4-D or 2,4,5-T has become almost standard practice in some parts of the world for selectively controlling grasses and other herbaceous weeds to conserve moisture for and/or prevent the smothering of newly-planted conifers. In...

Resource Type:

Masters Thesis
Snowbrush, Ceanothus velutinus Dougl., its ecology and role in forest regeneration in the Oregon Cascades

Creator:

Zavitkovski, J.

Abstract:

The ecological and silvicultural importance of snowbrush, Ceanothus velutinus, in the areas west of the summit of the Oregon Cascades was studied. Particular attention has been given its nitrogen- fixing ability under both field and greenhouse conditions. On west slopes of the Oregon Cascades snowbrush occurs above 2, 500 feet...

Resource Type:

Dissertation