首页|Ingrowth, survival and height growth of small trees in uneven-aged Picea abies stands southern Finland

Ingrowth, survival and height growth of small trees in uneven-aged Picea abies stands southern Finland

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The purpose of the study was to analyse height growth,mortality,and ingrowth of individual small-sized trees in uneven-aged spruce-dominated stands.It was based on experimental data from 16 stands for a 15-year observation period including four measurements with a 5-year interval.In the data of this study,the heights of small-sized trees varied from 0.1 to about 9 m.Results showed that the growth of small trees was rather slow,particularly in the smallest size classes.With average growth rates it would take about 60 years for a freshly emerged spruce germinant to achieve 1.3 m in height.The stand density,site quality and selection cuttings affected the growth of small-sized spruces.Average five-year mortality rates for spruce,birch and pine were 17.0％,40.9％ and 33.9％,respectively.Annual ingrowth rates with the threshold height of 1.3 m for the three species were on average 30.4,2.8 and less than 0.1 trees per hectare,respectively.Even if,a selection cutting of modest intensity (25％ of basal area removed on average) seemed to have accelerated the growth of small spruces,it is recommended that more intensive harvestings be applied to enhance the survival and growth of small spruces,it is also concluded that shade intolerant species like birch and pine do not seem to be capable of developing into viable undergrowth in spruce selection stands with their current levels of stand density.

GrowthRegenerationSelection cuttingSilvicultureUneven-aged forest

Kalle Eerik(a)inen、Sauli Valkonen、Timo Saksa

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Finnish Forest Research Institute, Joensuu Unit, P.O.Box 68, FI-80101 Joensuu, Finland

Finnish Forest Research Institute, Vantaa Unit, P.O.Box 18, FI-01301 Vantaa, Finland

Finnish Forest Research Institute, Suonenjoki Unit, Juntintie 154, FI-77600 Suonenjoki, Finland

2014

10.1186/2197-5620-1-5

森林生态系统(英文版)
北京林业大学

森林生态系统(英文版)

CSCD
影响因子：0.09
ISSN：2095-6355
年,卷(期)：2014.1(1)
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