不同造林技术措施对马尾松幼林生长影响的研究

EFFECTS OF DIFFERENT SILVICULTURAL TECHNIQUES ON GROWTH OF YOUNG MASSON PINE PLANTATIONS

在贵州省台江县革东镇设置了反映马尾松人工造林各主要技术环节的试验林体系，以研究不同造林技术措施对马尾松幼林生长的影响。经对试验林固定样地进行连续８年的定期、定位测定，以及对测定结果进行统计分析，结果表明，在马尾松人工造林的各主要技术措施中，立地选择、种源选择和造林密度是影响幼林生长的最重要因素，整地规格对马尾松幼林生长有较明显影响，幼林施肥有一定影响，而整地方式和幼林抚育则无明显影响。在研究基础上初步提出了可供试验地区应用的马尾松工业用材林定向培育的造林技术措施。

A series of Masson pine experiment stands were established in Taijiang County of Guizhou Province. The stands included main technical processes of growing Masson pine plantations. The purpose of establishing the stands was to study the effects of different silvicultural techniques for growth of young Masson pine plantations. Based on the yearly measures of permanent plots of the stands for 8 years, and the statistical analyses of the measured data, the results showed that selection of different sites and seed origins, and planting density were the most important factors influencing growth of young Masson pine plantations among all main silvicultural techniques. Size of planting holes had more obvious effect on the growth of the young stands. Fertilization of the young stands had effect in a certain extent. Soil preparation way and young stand tending had no obvious effect on growth of the young plantations. Directive cultural techniques of growing the industrial Masson pine plantaions used in the trial area were preliminarily developed on the bases of above study. The techniques are as follows: Planting site lower, mid-lower and middle of mountain slopes, site index is above 16. Seed origin select seed origin of Gupeng and Tongmian in Guangxi Province. Planting density on middle quality site, building～timber:1665～2500 tree/hm 2, pulpwood:3330～4440 tree hm 2,fiber and chip board timber:4995～6660 tree/hm 2. Soil preparation way spot preparation. Size of planting hole 40cm×40cm×25cm. Fertilizing young stand under the conditions of serious P deficiency calcium and magnesium phosphate used as base fertilizer, above 60g/hole (above 266kg/hm 2);compound fertilizer used as topdressing, above 30g/hole (above 133kg/hm 2). Young stand tending cut weeds and shrubs twice per year for 3 years.