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首页> 外文期刊>Southern Journal of Applied Forestry >Relationships among Diameter at Breast Height and Loblolly Pine Attributes from Local and Nonlocal Seed Sources near the Western Edge of the Natural Range of Loblolly Pine
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Relationships among Diameter at Breast Height and Loblolly Pine Attributes from Local and Nonlocal Seed Sources near the Western Edge of the Natural Range of Loblolly Pine

机译：在火炬松自然分布区西缘附近的本地和非本地种子源中，乳房高度直径与火炬松属性之间的关系

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Individual loblolly pine sample trees planted in 1983 as part of a seed source and density study on Carter Mountain near Broken Bow, Oklahoma, were used to investigate the effects of seed source and density on the relationships between dbh, height, crown length, and individual tree volume. The study site is a rocky, mountain soil near but outside the western boundary of the loblolly pine natural range in Oklahoma. North Carolina coastal and Oklahoma Arkansas seed sources were planted at 4 X 4-, 6 X 6-, 8 X 8-, and 10 X 10-ft spacings. Individual tree measurements were available at plantation ages 17, 18, 19, 22, and 25 years. The dbh of sample trees ranged from 4 to 13 in., and heights ranged from approximately 30 to 70 ft. Regression relationships between individual tree dbh and height indicated a significant difference due to seed source, with the North Carolina source being approximately 7% taller across the dbh range in these data. This indicates that the North Carolina seed source is taller for a given dbh even at the extreme western edge of the loblolly natural range. The average dbh-height relationship also was significantly affected by density, but the North Carolina seed source was taller on average per given dbh for all densities. In addition to being taller for a given dbh, the North Carolina had a longer live crown and more cubic stem content than the Oklahoma Arkansas seed source.
机译：在俄克拉荷马州Broken Bow附近的Carter山上，作为种子来源和密度研究的一部分，于1983年种植了单个火炬松样本树，以研究种子来源和密度对dbh，高度，树冠长度与个体之间关系的影响。树体积。研究地点是俄克拉荷马州火炬松自然范围的西部边界附近但不在岩石边界的山区土壤。北卡罗莱纳州沿海和俄克拉荷马州阿肯色州的种子源以4 X 4、6 X 6、8 X 8和10 X 10英尺的间距种植。在17、18、19、22和25岁的人工林中可以进行单独的树木测量。样本树的dbh范围为4到13英寸，高度范围为大约30到70英尺。由于种子来源，单个树的dbh和高度之间的回归关系表明存在显着差异，北卡罗来纳州的树高大约7％这些数据在dbh范围内。这表明即使在火炬状自然范围的最西端，给定的dbh，北卡罗来纳州的种子源也更高。平均dbh高度关系也受到密度的显着影响，但在所有密度下，北卡罗莱纳州的种子来源平均每给定dbh都更高。北卡罗莱纳州除了给定的dbh更高以外，还比俄克拉荷马州阿肯色州的种子来源具有更长的活冠和更多的立方茎含量。

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