论文部分内容阅读
火炬松原产美国东南部。我国于1934年,1947年有少量引种栽培,现已成长为大树。几十年的引种实践证明,火炬松具有生长快,干形通直、病虫危害较轻等优点。由于种源缺乏,如何集约经营母树林,达到速生丰产,提早结实,获得优良种子之目的,实为急待解决的重要研究课题。为此,马鞍山市林场与林科所配合,主攻其关,实施了“五项技术措施”,12年来,母树林已表现出显著的优越性。现作阶段性小结如下: 一、母树林地的自然概况林地位于北纬31°32′,东经118°3′,海拔高度20—30米,土壤为山地黄壤(俗称黄泥土),质地为轻壤—中壤,土层深度1米左
Pinus pine origin of the southeastern United States. China in 1934, 1947 a small amount of introduction and cultivation, has now grown into big trees. The introduction of decades of practice proved that, with rapid growth of loblolly pine, stem straight, less harmful pests and other advantages. Due to the lack of provenances, how to conduct intensive management of the mother trees and achieve fast-growing and high-yielding, early maturity, and good seeds is an urgent and urgent research topic. To this end, Ma’anshan City Forestry Bureau and Forestry Branch with the main off its customs, the implementation of the “five technical measures”, 12 years ago, the parent forest has shown significant superiority. The current phase of the summary is as follows: First, the natural overview of the mother woodland Woodland is located at latitude 31 ° 32 ’, longitude 118 ° 3’, 20-30 meters above sea level, the soil is yellow mountain soil (commonly known as yellow soil), the texture of light soil - Medium soil, soil depth of 1 meter left