平泉油松建筑材林立地类型划分及立地质量评价

Site Classification and Site Quality Evaluation of Pinus tabulaeformis Plantation for Construction Timber in Pingquan,Hebei Province

【目的】对河北省平泉市油松人工林进行立地类型划分和立地质量评价,并将立地质量分级,以期筛选出适合培育油松建筑材林的林地。【方法】以河北平泉油松人工林为研究对象,基于92块固定样地数据和42株解析木数据,采用主导因子分析法筛选主导因子,并划分立地类型。采用相对优势高法编制立地指数表,根据立地指数表进行立地质量评价。选取林龄、密度一致,立地质量不同的9块样地,伐取优势木,分析油松木材物理力学性质。【结果】由平泉油松人工林立地类型分布图可知,中土层油松人工林最多,占油松人工林总面积的65.5%,薄土层次之,占油松人工林总面积的27.9%,厚土层最少,占油松人工林总面积的6.6%;阴坡油松人工林分布较多,占油松人工林总面积的76.6%,阳坡分布较少,占油松人工林总面积的23.4%。由立地指数分布图知,立地指数为9、10的地块占地面积14277.665 hm^(2),占总面积的28.1%;立地指数为6、7、8的地块占地面积33648.51 hm^(2),占总面积的66.1%;立地指数为4、5的地块占地面积2973.63 hm^(2),仅占总面积的5.8%。【结论】河北平泉地区立地质量处于中等偏上水平,适合培育油松建筑材林,黄土梁子镇和柳溪满族乡为最佳地点。

【Objective】The site classification and site quality evaluation of Pinus tabulaeformis plantation in Pingquan,Hebei Province were carried out,and the site quality was graded in order to select suitable plantations of P.tabulaeformis for construction timber.【Method】The P.tabulaeformis plantation in Pingquan was investigated using the data from 92 fixed plots and stem analysis of 42 trees,the method of dominant factor analysis was used to screen out the dominant factors.The site index table was compiled by the method of comparative advantage,and the site quality was evaluated according to the table.Combined with the site index distribution map,9 sample plots with the same age and density but different site quality were selected to analyze the physical and mechanical properties of P.tabulaeformis wood by cutting dominant trees.【Result】According to the site type distribution map of P.tabulaeformis:the middle soil layer is the most distributed,accounting for 65.5%of the total area,the thin soil layer is 27.9%,the thick soil layer is the least,accounting for 6.6%;the shaded slopes are more distributed,it accounts for 76.6%,and the sunny slopes are less distributed,accounting for 23.4%.According to the distribution map of site index:the plots with site index of 9 and 10 cover an area of 14277.665 hm^(2),accounting for 28.1%;the plots with site index of 6,7,and 8 cover an area of 33648.51 hm^(2),accounting for the total area 66.1%;only 2973.63 hm^(2) has a site index of 4 and 5,accounting for only 5.8%【Collusionn】The quality of the site in Pingquan is at the upper-middle level,which is suitable for construction timber,for which Huangtuliangzi Town and Liuxi Manchu Township are the best sites.