论文部分内容阅读
油松(Pinus tabulaeformis carr.)是华北地区山地造林的主要树种之一,不同立地条件下和不同树种组成的油松人工林生长表现各异。本文试图从营养角度探讨这些人工林的差异。为此,对油松人工林内各树种[包括油松、元宝枫(Acer truncutum Bge)、侧柏(Platycladus orientalis(L.) Franco)]叶的N、P、K、Ca、Mg、Cu、Fe、Mn和Zn的元素含量进行了连续三年(1983—1985年)的研究。试验结果表明,不同树种不同立地条件下的元素含量不同。元宝枫的元素含量极为丰富,在其适生立地条件下尤其如此,因而元宝枫是营造油松混交林的良好伴生树种。不同年份和年内不同季节元素含量也有变化。这些数据可为林地施肥和森林抚育提供基础资料。
Pinus tabulaeformis carr. Is one of the main tree species afforestation in North China. The growth performance of Pinus tabulaeformis carrot is different under different site conditions and different tree species. This article attempts to explore the differences in these plantations from a nutrition standpoint. For this reason, the contents of N, P, K, Ca, Mg, Cu, Fe in the leaves of Pinus tabulaeformis plantation [including Pinus tabulaeformis, Acer truncutum Bge and Platycladus orientalis (L.) Franco] , Elemental contents of Mn and Zn were studied for three consecutive years (1983-1985). The test results show that different species under different site conditions of different elements. The elemental content of Aloe capelin is extremely rich, especially under its suitable habitat conditions. Thus, Alopecurus fortunei is a good companion tree for the mixed plantation of Pinus tabulaeformis. In different years and years of different seasons also have changes in elemental content. These data provide basic information for forest fertilization and forest tending.