京山县太子山林场柏木生长规律研究

Growth Law of cupressus funebris in Jingshan county Taizishan Forest Farm

摘要:

2020年 7月 ,在湖北省太子山林场管理局雁门林场 44a生柏木人工林中设置临时标准样地,并选取标准木进行 树干解析和测定,对柏木生长规律进行研究,结果表明:柏木胸径和树高生长快速期都出现在 10~20a,胸径和树高的连年 生长量均在第 20年生时达到最大值,胸径和树高的平均生长量均在第 30年生时达到最大值,材积连年生长量第 40年时 出现最大值;在 44a期间材积平均生长量一直处于上升趋势,没有达到最大值;胸径生长率和树高生长率最大值出现在第 10年,材积生长率最大值出现在第 20年。

Abstract:

yanmen forest farm in hubei province Jingshan county setup standard samples of 44years plantations of cu- pressusfunebris temporarily, and select standard wood tree for parsing and determining, to study the growth rule of cupre- ssus funebris in July2020. The results showed that the rapid period of diameter at breast height, tree height growthat early stage;The annual increment of DHBand average increment growth a maximum at 10—20years;The annual increment of tree height and average increment growth a maximum at 20years;when 30years volume increment reaches a maximum, and average volume increment has been characterized by steady growth trend, within 44years volume average growth rate has been rising, have not reached the maximum; The breast height form number from the second year in a downward trend ;The maximum growth rate of diameter at breast height and tree height growth rate was in 10years, the maximum volume growth rate was in 20years.