杉木人工复层林试验初报

本研究探讨杉木人工复层林营造技术。通过对４０年生杉木林不同程度的疏伐，采用１年生杉木实生苗在其林冠下营造复层林，３ａ的试验结果表明：不同疏伐区内的下层木平均树高为对照区的４２．４％～５１．１％，平均地径为对照区的３９．６％～４９．６％，成活率为对照区的６４．７％～９８．１％；不同处理区间的栽植木生长具有极显著差异，在复层林中以Ｂ区的下层木成活与生长为最佳，初步认为维持杉木人工复层林的下层木正常生长，林内相对照度必须达到５０％以上。

A Preliminary Report on the Experiment of Artificial Irregular Forests of Cunninghamia lanceolata

The present study approaches the planting techniques of artificial irregular forests of Cunninghamia lanceolata.Through the different-degree thinning,1-year-lod C.lanceolata seedlings were adopted to plant irregular forests under the leaf canopies of 40-year-old C.lanceolata.The 3-year experimental results indicate that the average height of underwoods in different thinning plots is 424511% of that in the control plot,the average ground diameter is 396496% of that in the control plot and the survival rate is 647972% of that in the control plot;the growth of planting trees is of extremely significant difference among different treatment plots;and the survival and growth of underwoods are optimal in the B area in the irregular forests.It is preliminarily thought that to maintain the normal growth of underwoods in the artificial irregular forests of C.lanceolata,the relative illumination in the forests must reach over 50%.