摘要:

Advance conifer regeneration readily survives release from overstory competition in the Inland West, but foresters are concerned about the ability of released trees to attain normal growth rates. There are also concerns about forest health issues associated with managing advance regeneration. The best pre-release predictors of post-release growth response are pre-release vigor and crown ratio at release. The fastest growing trees before release grow the fastest following release. A general recommendation is that at least a 0.50 crown ratio at release is necessary for good response to release. A 0.50 crown ratio means that trees will have the necessary photosynthetic capability to respond to changes in stand conditions. The best time to release advance regeneration is after budset in the fall but before budbust in the spring. Release during this time period means needles that develop the first summer after release will be adapted to full sunlight. A conceptual framework of physiological response to release is presented.

ISSN:1054-9811    

DOI:10.1300/J091v02n03_11

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The effect of forest management has been to override the dynamics produced by natural disturbances with a dynamic of human design. Under even-aged management, the forest is held in an early successional state, providing some habitat for species of open field and edge but little for species of the forest interior. Alternatively, uneven-aged management may maintain forest interior conditions but does not provide the large-scale heterogeneity created by pre-settlement disturbance processes. The traditional choice between even- and uneven-aged management approaches condemns the landscape to one of two mutually exclusive dynamics, causing the loss of natural landscape heterogeieity and the biodiversity it supports. The conservation of biodiversity will require that silviculture move beyond the artificial dichotomy of even- versus uneven-aged management to accommodate the full range of patterns, intensities, and frequencies of the natural disturbance regime. Traditional emphases on "regenerating the stand" and "optimizing growing stock" must be replaced by an emphasis on establishing the appropriate-sized cohort in the context of landscape-scale objectives.

ISSN:1054-9811    

DOI:10.1300/J091v02n03_12

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

No abstract available for this article.

ISSN:1054-9811    

DOI:10.1300/J091v02n03_13

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor