干旱区研究2017，Vol.34Issue(5)：1117-1123,7.DOI:10.13866/j.azr.2017.05.21
祁连山青海云杉直径结构及其对径向生长的影响
Diameter Structure and Its Effect on Radial Growth of Picea crassifolia Forest in the Qilian Mountains
摘要
Abstract
Picea crassifolia forest plays an important role in water conservation,the stand structure and the growth conditions of the forest are strongly affected by the ecological process and hydrological regime in mountainous area.In order to investigate the variation of radial growth of P.crassifolia,the P.crassifolia forest in altitude range of 2 500-3 300 m a.s.l.in the Pailougou drainage basin on the northern slope of the middle Qilian Mountains was studied by surveying the sample plots,regularly observing the tree growth and analyzing the diameter structure and its effect on radial growth of P.crassifolia forest in growth season.The results were as follows:Proportion of the trees with small diameter (4-8 cm) was high in P.crassifolia forest,the diameter structure of trees in the forest was in a reverse J-type distribution at altitude of 2 500 m.The trees with big diameter increased gradually,and the distribution of stand diameter structure was in an approximate cosine curve,which was an intermediate type of uneven-aged forest distribution curve at altitude of 3 300 m.The growth period of P.crassifolia at altitudes of 2 500 m and 3 300 m was from May to late September,and it could be divided into 3 growth phases,i.e.the initial growth phase (May),rapid growth phase (from June to August) and slow growth phase (September),the average radial growth rates in these growth phases were-0.66,7.59 and 5.l μm · d-1 · tree-1 respectively.In the study area,the radial growth rate of the trees increased with the increase of diameter.The average growth rate of the trees with big diameters was 6.91 μm · d-1 · tree-1,it was 1.65 times of that with middle diameter and 7.3 times of that with small diameter.The cumulative radial growth of the trees with middle diameter was higher than that with big and small diameter due to the influence of stand density,and it was 9 137.5 μm equivalent to 2.85 times of that with big diameter and 3.38 times that with small diameter.关键词
青海云杉(Picea crassifolia)/直径结构/径向生长/累积生物量/祁连山Key words
Picea crassifolia/diameter structure/radial growth/cumulative biomass/Qilian Mountains引用本文复制引用
李晓青,刘贤德,王立,于澎涛,牛赟,王顺利,万艳芳..祁连山青海云杉直径结构及其对径向生长的影响[J].干旱区研究,2017,34(5):1117-1123,7.基金项目
国家自然科学基金项目(41461004,91225302,91425301) （41461004,91225302,91425301）
甘肃省基础研究创新群体项目(145RJIG337) （145RJIG337）
甘肃省自然科学基金项目(1308RJZA256)资助 （1308RJZA256）
