马尖相思多点栽培试验阶段报告

A Stage Experiment Report on CuItivation of Acacia mangium in Some Plots

本文报道了在景洪、普文、思茅、河口、瑞丽５个地点所同时进行的马尖相思多点栽培试验２，５年生林分的测定结果。初步证实云南北热带及南亚热带南部，年均温１８℃以上，＞１０℃积温６３００℃以上，年降水量１２００ｍｍ以上，土壤ｐＨ值４～６，无霜或偶有轻霜的地区是马尖相思的适生区。在此区域内马尖相思表现出初期速生，年平均树高生长量达１．４６～１．７２ｍ，胸径生长量１．１７～１．５３ｃｍ。育苗造林措施与幼林管理质量对其生长影响很大。

This paper has reported the experiment resuIts of 2.5─years forest stands ofAcacia mangium in five plots of Jinhong,Puwen,Simao,Hekou and Ruili in Yunnan. It isproved that nothern tropic and southern subtropic of Yunnan are the optimum growing re-gions for Acacia mangium,where annual mean temperature are over l8℃,accumulated tem-perature of above l0℃ are over 6300℃,annual precipitation are over l200mm,soil pH valueare 4～6,frost-free or sometimes light frost In these regions,Acacia mangium prefoim grow-ing fast in their early period,height growth is 1.46～1.72m annual,breast diameter growth is1.17～1.53cm,Measures of seedlings nursery and planting and management to young foreststand affect their growth significantly。