Publication Date:
1984-08-01
Description:
Northern red oak (Quercusrubra L.) were planted in upland oak forests of the Missouri Ozarks. Plantings were made in 8 clearcut plots and in 16 plots thinned to 60% stocking. After three field growing seasons, the overstory was removed on one-half of the underplanted plots. The 2304 planted trees consisted of four classes of planting stock: small 1 + 0, large 1 + 0, 1 + 1, and container-grown. Shoots were clipped on one-half of the trees in each class. After five field growing seasons, average survival was 84%. Average heights of survivors were as follows: 118 cm for trees planted directly into clearcuts, 97 cm for underplanted–released trees, and 59 cm for underplanted–unreleased trees. Based on net shoot growth of trees after overstory removal, success probabilities were estimated using logistic regression analysis. The most successful trees were clipped 1 + 1 stock with initial shoot diameters (2 cm above the root collar) of 10 mm or more that were underplanted and subsequently released. For clipped 1 + 1 stock, success probabilities for a success criterion of 30 cm net height growth per year after overstory removal ranged from 0.61 to 0.77 for 10 to 16 mm diameter trees; for a success criterion of 40 cm, success probabilities were 0.42 to 0.63, respectively.
Print ISSN:
0045-5067
Electronic ISSN:
1208-6037
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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