油松建筑材密度管理图的编制及其应用

针对建筑材目的油松人工林经营措施,探讨不同生长发育阶段油松人工林密度调控下蓄积变化,为森林可持续经营提供科学依据。对河北平泉阳坡中土、阴坡中土和阴坡厚土3种主要立地类型的全生命周期油松人工林编制密度管理图,得出培育小、中、大径级建筑材措施。结果表明:河北油松建筑材林的培育,阳坡中土培育小径材、阴坡中土和阴坡厚土培育中大径材,期间经过2~3次间伐以达到高效培育的目的。阳坡中土林分,初植密度3 000~3 300株/hm2,10年生间伐强度12%,15年生强度20%,25年生强度25%,主伐时树高级为9~11 m,培育小径材。阴坡中土林分,初植密度2 700~3 000株/hm2,9年生间伐强度25%,19年生强度30%,主伐时树高级为9~11 m,培育中径材;初植密度2 200~2 500株/hm2,9年生间伐强度20%,17年生强度25%,27年生强度30%,主伐时树高级为11~13 m,培育大径材。阴坡厚土林分,初植密度2 000~2 300株/hm2,7年生间伐强度20%,15年生强度30%,主伐时树高级为11~13 m,培育中径材;初植密度1 000~1 200株/hm2,7年生间伐强度20%,13年生强度20%,23年生强度25%,主伐时树高级为13~15 m,培育大径材。

Preparation and Application of Density Management Map of Pinus tabulaeformis

The experiment was conducted to study the management measures of Pinus tabulaeformis plantation for the purpose of building materials cultivation, and discuss the accumulation changes under the control of density of P. tabulaeformis plantation in the whole life cycle, which provides a scientific basis for sustainable forest management. The density management map of the whole life cycle P. tabulaeformis plantation in the three main site types of the middle slope, the shady slope middle soil and the shady slope thick soil in Pingquan, Hebei Province, and the measures for cultivating small, medium and large diameter building materials were obtained. The cultivation of P. tabulaeformis forests in Hebei Province, the cultivation of small-diameter timber in the middle slope of the sunny slope, the cultivation of large-diameter timber in the middle slope of the shady slope and the thick soil of the shady slope, during the period of 2-3 thinnings to achieve efficient breeding. In the middle slope of the sunny slope, the initial planting density is 3 000-3 300 per hectare, the 10-a thinning intensity is 12%, the 15-a intensity is 20%, the 25-a intensity is 25%, and the main tree is 9-11 m in the main cutting, and the small-diameter material is cultivated. In the shady slope, the initial planting density is 2 700-3 000 per hm~2, the 9-a thinning intensity is 25%, the 19-a intensity is 30%, and the main tree is 9-11 m in the main cutting, and the medium-diameter material is cultivated;the initial planting density is 2 200-2 500 per hm~2, 9-a thinning intensity 20%, 17-a strength 25%, 27-a strength 30%, and the main tree height is 11-13 m during the main cutting, cultivating large diameter timber. On the shady slope thick soil stands, the initial planting density is 2 000-2 300 per hm~2, the 7-a thinning intensity is 20%, the 15-a intensity is 30%, the main tree is 11-13 m in the main cutting, and the medium-diameter material is cultivated. The initial planting density is 1 000-1 200 per hm~2, 7-a thinning intensity 20%, 13-a strength 20%, 23-a strength 25%, and the main tree height is 13-15 m during the main cutting, cultivating large diameter timber.