混交造林模式与用苗量计算  

THE PATTEN OF MIXED FORESTATION AND COUNTING THE NUMBER OF SEEDLINGS

作　　者：苏志才 

机构地区：[1]陕西省横山县林业局

出　　处：《林业科学》1989年第1期74-78,共5页Scientia Silvae Sinicae

摘　　要：混交图式是造林学中的一个基本概念,生产中经常要用到它。它虽然有看图易懂的特点,但存在着三个缺陷:(1)画图难度较大,增加了造林作业设计工作量;(2)在造林类型表中无法表示,因此需要附加图式;(3)用苗量难以计算。为了克服混交图式上述缺陷,我们探讨试用混交造林模式表达混交图式。混交造林模式虽然克服了混交图式的缺陷,但不能代替造林典型设计图,尤其在某些特殊立地条件下,如在流动风沙地的不同类型沙丘上造林。In order to overcome the difficulties of drawing design and counting the number of seedlings, the author thinks it is better using the patten of mixed forestation instead of the drawing. The patten contains two parts, namely, elementary and composing pattens, the fomer includes the pattens of mixed in line, in belt and in blocks, the latter can be make up according to the elementary pattens, the formula of the number of seedlings have been given, three examples using the pattens also have been given.

关 键 词：模式 行状混交 带状混交 造林模式 

分 类 号：S725.2[农业科学—林木遗传育种]