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在内布拉斯加州中部的柏塞苗圃,于重复试验的三个生长季中,测量了美国西部黄松80个天然林种源的24个性状,依据13个性状做了聚类分析,并根据分析结果把80个种源划分为9个地理类型组。其中加利福尼亚州和北高原(俄勒冈州、华盛顿州、爱达荷州及蒙大拿州西部)两组是美国西部黄松的一个变种var.ponderosa(pinus ponderosa var.ponderosa)的适生区;其余各组,北美分水岭以东地区和分水岭以西的一个亚利桑那州种源被定为美国西部黄松的另一个变种var.scopulorum(Pinus ponderosa var,scopulorum)的变种区。并划成下列各组:(1)位于蒙大拿州中西部的两个变种过渡区;(2)蒙大拿州中部;(3)由怀俄明州中北部到科罗拉多州中南部的落基山中段;(4)黑丘和由蒙大拿州东部到内布拉斯加州西部周围的大草原;(5)最东边,内布拉斯加州北部低海拔区;(6)福兰特山脉以东的科罗拉多州草原;(7)由科罗拉多州南部一直延伸到新墨西哥州中部和亚利桑那州的南段落基山。这些地理轮廓提供了该树种在广阔的东部分布区内遗传变异的新知识,同时还可以作为种子收集和生长预测的方便分区。
Twenty-four traits of 80 natural forest provenances in the western United States were measured during the three growing seasons in Central Nebraska at Cesena nursery, based on 13 traits and clustered According to the results of the analysis, 80 provenances were divided into 9 geographical type groups. Two groups of California and Northern Plateau (Oregon, Washington, Idaho and western Montana) are suitable areas for var. Poderosa (pinus ponderosa var. Poderosa), a variant of Pinus ponderosa in the western United States; the rest In each group, an Arizona provenance east of the North American divide and watershed west of the watershed was designated as a variant of var. Scopulorum (Pinus ponderosa var. Scopulorum), another variant of Ponderosa americana. And is divided into the following groups: (1) two variant transitional regions located in the Midwestern Montana; (2) central Montana; (3) mid-north of Wyoming to mid-southern Rocky Mountain, Colorado ; (4) the Black Hills and the prairie from the eastern part of Montana to the western part of Nebraska; (5) the easternmost part of northern Nebraska; and (6) the eastern part of the Forran Mountains (7) extends from southern Colorado to the southern Rockies in central New Mexico and Arizona. These geographical profiles provide new knowledge about the genetic variation within the broad eastern distribution of the tree species and can be used as a convenient zoning for seed collection and growth prediction.