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前言密度控制表是用来调节林木生长的水平空间,使在一定的生长条件下发挥高度的生长能力。目前,国内各地对林分密度控制的研究,采用方法不尽然相同。为了控制我省北部华北落叶松的密度,我们进行了研究,试编了华北落叶松林抚育密度控制表。该表所用资料主要取自宁武县管涔森林经营局马家庄林场,1957年由原中央林研所及省林科所设立的抚育强度标地14块,并结合近年来在长城山、恒山、五台山林场等地19块标地,23年来共观测108块次。在此基础上,选出最密林分标地23次观测值,供适宜密度优选的标地共11个试验组合。编制中我们吸收了国内外的先进经验,以林分平均直径的增长
Introduction Density control table is used to adjust the level of forest growth space, so that under certain growth conditions to play a high growth capacity. At present, the research on the density control of forests in various parts of China is not always the same. In order to control the density of Larix principis-rupprechtii in the northern part of our province, we conducted a study and compiled a test table for the density of Larix principis-rupprechtii stands. The data used in this table are mainly taken from Majiazhuang Forest Farm of Guanwu Forest Management Bureau in Ningwu County and 14 nurturing intensity plots set up by the former Central Forestry Research Institute and the Provincial Forestry Branch in 1957. Combining with recent years, Hengshan, Wutaishan forest and other places 19 standard, 23 years a total of 108 observations. On this basis, 23 observations of the most dense forest were selected for a total of 11 experimental combinations with the most suitable density. In preparation, we absorbed the advanced experience both at home and abroad to increase the average diameter of the forest