帽儿山实验林场白桦人工幼林适宜微立地研究

Study on Suitable Microsite for Young Betula platyphylla Plantation in Experimental Forest Farm of Mao'er Mountain

在相同立地上的不同类型的微立地环境中,测定白桦幼树生长指标和土壤含水率,并以邻近微环境外的4株白桦作为对照,分析微立地环境对白桦幼树生长的影响。研究结果表明:由伐根和倒木等粗大木质残体构成的微立地对白桦幼树的生长均产生明显的促进作用。凸凹地形微立地对幼树生长的作用因所处立地条件而异,凸地形、凹地形分别在下坡位和上坡位有利于白桦幼树生长。灰烬堆微立地在上坡位不利于白桦的生长,中、下坡有利。白桦人工造林时,根据立地条件科学选择微立地作为栽植点可以有效改善幼林的生长表现。

The growth indexes of young Betula platyphylla Suk trees and soil moisture content in different types of microsite under the same site condition were measured to study the influence of microsite conditions on the growth of youmg trees,taking four closely neighbored Betula platyphylla Suk trees as control.The study results showed that microsites consisting of stumps and coarse woody debris had positive effects on young tree＇s growth.Meanwhile,the effect of convex and concave terrain on young tree＇s growth varied,which depended on the site conditions.The convex and concave terrain were good for tree growth when they lied in low and high slope position respectively.The microsite composed by burned slashes was bad for tree growth when it lied in high position,but good in mediate and low position.It was important to choose adequate microsites for plantation in this area,which could improve young tree＇s growth effectively.