10年生杉木机械造林与炼山造林生长过程差异分析

测定传统炼山块状整地(A处理)、不炼山机械2种规格挖穴宽度(B1处理200 mm,B2处理300 mm)等3种类型的10年生杉木林的胸径、树高和材积生长情况,分析不炼山机械造林杉木生长过程与传统人工炼山造林的差异。结果表明,与A处理相比,B1、B2处理均表现为幼林早期(3-4年)胸径生长较慢,后期(8-10年)反之,连年生长量与平均生长量相交时间预计推迟1年多;平均树高生长与胸径生长过程基本相似,连年生长量和平均生长量相交时间预计推迟3.5年左右;材积生长量B1处理和B2处理分别比A处理提高8.8%和11.8%,且杉木单株材积平均生长量一直处于上升状态,均未达到最大值。

Difference of growth process of 10 years old Cunninghamia lanceolata between mechanized afforestation and traditional control burning afforestation

In order to analyse the difference in growth process of Cunninghamia lanceolata between mechanized afforestation and traditional control burning afforestation.the growth of diameter at breast height,tree heights and volume of the 10 years old C.lanceolata forest planted by the traditional control burning(in treatment A) and by planting machines with two types of hole diameters(200 mm of the hole diameter in treatment B1 and 300 mm of the hole diameter in treatment B2) were measured.The results showed that compared with the traditional control burning afforestation,the growth of diameter at breast height planted by planting machines was slow at the early stage(3 to 4 yearss old) of young plantation,but on the contrary when 8 to 10 years old.The intersection of average increment and current annual increment was predicted to delay more than 1 year.The growth of average height performed in the similar way.The intersection of average increment and current annual increment was predicted to delay about 3.5 years.Volume growth in treatment B1 and treatment B2 was increased by 8.8% and 11.8%,and the average increment of volume per tree in all the treatments was increasing below the maximum.