A stand-level growth and yield model for thinned and unthinned even-aged Scots pine forests in Norway

编号 030037804

推送时间 20230116

研究领域 森林经理 

年份 2022 

类型 期刊 

语种 英语

标题 A stand-level growth and yield model for thinned and unthinned even-aged Scots pine forests in Norway

来源期刊 SILVA FENNICA

期 第378期

发表时间 20220322

关键词 Pinus sylvestris;  mortality;  production forestry;  seemingly unrelated regression;  system of equations;  volume growth; 

摘要 Management of Scots pine (Pinus sylvestris L.) in Norway requires a forest growth and yield model suitable for describing stand dynamics of even-aged forests under contemporary climatic conditions with and without the effects of silvicultural thinning. A system of equations forming such a stand-level growth and yield model fitted to long-term experimental data is presented here. The growth and yield model consists of component equations for (i) dominant height, (ii) stem density (number of stems per hectare), (iii) total basal area, (iv) and total stem volume fitted simultaneously using seemingly unrelated regression. The component equations for stem density, basal area, and volume include a thinning modifier to forecast stand dynamics in thinned stands. It was shown that thinning significantly increased basal area and volume growth while reducing competition related mortality. No significant effect of thinning was found on dominant height. Model examination by means of various fit statistics indicated no obvious bias and improvement in prediction accuracy in comparison to existing models in general. An application of the developed stand-level model comparing different management scenarios exhibited plausible long-term behavior and we propose this is therefore suitable for national deployment.

服务人员 付贺龙

服务院士 唐守正

PDF文件 浏览全文