岷县马沿林场森林状况调查及其生长状况分析

Investigation and Growth Analysis of Forest in Mayan Forest Farm in Minxian

[目的]了解岷县马沿林场森林状况及其生长状况。[方法]对岷县马沿林场管理的8个乡共24个小班70多个标准样地中的树木进行每木调查。[结果]树种组成以红桦(Betula albo-sinensis)与华北落叶松(Larix principis-rupprechtii)株数比为7∶3为主。林木蓄积量与海拔、坡向及幼树株数有显著的相关性。胸径比较完美地服从正态分布,平均值为10.26 cm。树高不服从正态分布,平均值为10.64 m,主要分布区间为8～14 m,93.9%的成株林木树高在这个范围内,但平均值周围分布较少,10～12 m的范围只占16.3%。材积也较服从偏左正态分布,主要分布区间为0～0.1 m3,占比为95.7%。[结论]岷县马沿林场林木生长状况良好,幼苗生长状况一般,天然更新状况良好,树种组成以桦树与落叶松株数比为7∶3为主。

[Objective]To understand the forest status and growth of Mayan forest farm in Minxian.[Method]The trees in more than 70 standard plots of 24 small classes in 8 townships in Mayan forest farm,Minxian were investigated.[Result]The number of tree species was mainly 7∶3 based on the ratio of Betula albo-sinensis to Larix principis-rupprechtii.There was a significant correlation between tree stock and altitude,slope direction and number of young trees.DBH obeyed normal distribution perfectly,the average value was 10.26 cm.The tree height didn’t obey normal distribution,the average value was 10.64 m.The main distribution range was 8-14 m,93.9%of the adult tree height was in this range,but the average distribution was less around,the range of 10-12 m was only 16.3%.The volume distribution also obeyed the left normal distribution,and the main distribution interval was 0-0.1 m 3,accounting for 95.7%.[Conclusion]The seedlings of Mayan forest farm in Minxian grew well and the natural regeneration of seedlings was generally good.The ratio of birch to larch was mainly 7∶3.