引言西黄松(Pinus Ponderosa Dougl ex Laws)是北美西部分布非常广泛的重要软材松树种类之一。在美国西部山区、高原和谷地上各种变化很大的土壤类型和气候条件下,它都能长成天然林。西黄松在天然分布区内被普遍地栽培在各种海拔高度的地点。由于它向东分布伸展进入大平原区,而且已知它能很好地适应于干旱和大风的立地条件,所以又常常用它来和杜松及干旱地的阔叶树种在蒙大拿、北达科他至俄克拉何马和新墨西哥州的整个区城内营造防护 Introduction Pinus Ponderosa Dougl ex Laws is one of the most widely distributed species of soft-wood pine in western North America. It grows into a natural forest under varied soil types and climates in the mountains, highlands and valleys of the western United States. Pinus ponderosa is widely cultivated at various altitudes in the natural distribution area. Because it spreads eastward across the Great Plains and is known to adapt well to drought and windy conditions, it is often used in conjunction with deciduous and arid land species in Montana, North Dakota Protect the entire city of Oklahoma and New Mexico