Thinning control of conifer plantations in Great Britain

Abstract

The various elements which comprise a thinning regime are described, that is the thinning type, the intensity of thinning, the thinning cycle, the thinning yield and the timing of thinning.The control system used when marking a stand for thinning is described. The system is based on control of the volume removed in a thinning operation and relies on field assessments of basal area stocking and the volume marked as thinnings.

Vulnerability to wind damage in managed landscapes of the coastal Pacific Northwest

“…Although spectacular, catastrophic events may cause less damage through a typical rotation than endemic damage (Rollinson, 1987). Areas where strong winds are common may be less subject to catastrophic damage because of preconditioning of stands to wind.…”

Determining Ideal Timing of Row Thinning for a Cryptomeria japonica Plantation Using Event History Analysis

“…The polynomials were derived to fit the observed growth trends (1991-2011) of different treatments (2-5R), which were used to simulate tree-ring increments for the study period. Wide but reasonable ranges for repeat thinning (5-25 years) [39] and observation (100 years from the initiation of thinning in 1990) periods were set for the comparisons (%), which were the relative percentages defined as ratios of mean annual growth gains (cm·tree -1 ·year -1 ) of different repeat thinning periods and treatment, and the corresponding event history analysis-derived time validities with the multiplication of 100. If the modeled time of thinning was ideal, the ratios should not be greater than 100%.…”

Numerical modelling of airflow within and above forests and forest clearings using computational fluid dynamics.

“…The winds that cause endemic windthrow are the annual peak winds observed in a region with gusts around 30 ms" 1 (Quine, 1995;Quine and Bell, 1998). It is these endemic winds that cause more damage to timber supplies than catastrophic winds (20 % versus 6 %, respectively) (Rollinson, 1987and Atterson, 1980as cited in Rollinson, 1987.…”

“…Windthrow can be described as either catastrophic or endemic (Rollinson, 1987;Quine, 1995 andStathers et al, 1994). The winds causing catastrophic windthrow are usually caused by exceptional storms that have very high winds (gusts > 40 ms" 1 ) and are infrequently recorded 1 in an area (Quine, 1995).…”