雁北半干旱风沙区杨树人工林生长规律研究  

Study on the Growth Laws of Mature Poplar Forest in Semi-arid and Sandy Areas in Yanbei

作　　者：柴树峰 

机构地区：[1]山西省杨树丰产林实验局薛家庄林场,山西大同037000

出　　处：《山西农业大学学报（自然科学版）》2015年第5期499-503,共5页Journal of Shanxi Agricultural University(Natural Science Edition)

基　　金：山西省自然科学基金(2013011030-3);山西省科技攻关项目(2007031015)

摘　　要：杨树是雁北地区调控生态系统平衡的主要造林树种，研究杨树人工林的生长规律，直接关系到退化防护林的更新改造。通过对杨树生长规律的研究表明：（1）幼龄期和更新成熟期（1～12 a）杨树平均树高生长量为21.5 cm ；成熟期（12～17 a）为高生长的速生期，年平均高生长量100 cm ；衰老期（18 a 以后）年树高平均生长量下降到30 cm ；18年以前胸径生长量递增，之后递减，年平均胸径生长量0.46 cm ；10 a 进入材积的快速生长期，20 a 后材积生长量趋于平缓，林木进入成、过熟发育阶段。（2）材积生长量与胸径、枝干生物量以及树干生物量与胸径均呈线性回归关系，回归方差检验达到极显著水平。（3）低海拔黄土丘陵区的林木材积生长量是高海拔地区的1.9倍，且阴坡的材积生长量大于阳坡。（4）受雁北地区气候、土壤、水文和小气候环境的生理胁迫，小叶杨的树高、胸径生长表现出更新成熟后快速进入成熟期和衰老期，成熟期的速生过程受到抑制，树干形数高达0.96，比正常形数高出1.25倍。Poplar is the main planting tree species to regulate and control ecosystem balance in YanBei area ,the research on the laws of the growth of poplar artificial forest directly related to the renewal and reconstruction of the degenerative protection forest. The results showed that ：（1） The average tree height growth rate was 21.5 cm when poplar was in the young period and update mature period （1 ～ 12 a） ,the mature period （12 ～ 17 a） was the fast‐growing period of height growth ,its tree height grow th average was 100 cm a year ;the average tree height growth reduced to 30 cm when it was in the ageing （after 18 a）. The DBH growth increased progressively before 18a ,and then decreased progressive‐ly ,the DBH growth average was 0.46 cm a year. It needed 10 years to get into the rapid growth period of the volume of wood ,and 20 years later its grow th of volume of wood drived to mild ,trees got into over mature stages. （2） A linear regression relationship existed between the growth of volume wood and DBH ,biomass of limbs ,biomass of trunks ,and regression test of variance reached extremely significant level. （3） The growth of forest volume at low altitude loess hilly‐gully region was 1.9 times that at high altitude ,and volume growth of shady slope was higher than that of sunny slope. （4） Because of receiving the physiological stress of YanBei region such as climate ,soil ,hydrology and microcli‐mate environment ,Simonpoplar got into adulthood and aged rapidly after it update and mature , the fast‐growing process of adulthood was restrained ,the form index of trunk was 0.96 ,which was 1.25 times as high as the normal form index.

关 键 词：雁北半干旱风沙区 杨树人工林 生长规律 

分 类 号：S725.7[农业科学—林木遗传育种]