长白落叶松工业用材林初植密度选择及收获研究

INITIAL DENSITY SELECTION AND HARVEST OFTIMBER PLANTATION OF LARIX OLGENSIS

黑龙江省东南部地区,在未经人工干扰、发育良好、保持初植密度不变的长白落叶松人工林中典型取样,应用静态标准地树干解析作动态分析,应用林学理论、数学理论和计算机工具分析扩展初植密度。以11.3地位指数分析,15～35a长白落叶松人工林竞争敏感密度(竞争阈)平均1800株/hm2;15～10a密度竞争减弱,竞争敏感密度和有效密度上浮在1900和2000株/hm2为理论依据设计初植密度;10a以下竞争不明显。为培育工业用材,强调收获量和降低成本,适合采用1700～2000/hm2为理论依据设计初植密度。以此密度设计造林能够产生空白生态位,用于生物多样性的发展,为搞复合经营创造条件。

In this paper the initial density was derived by sampling in larix olgensis plantations,undisturbed,well developed in thoutheast area of Heilongjiang,dynamically analyzing stem analysis and using computers.By 11.3 site index analyzing,the compesitive sensitive density averages 1800 plants per hm2 at ages of 15～35 per hm2.The competition is weak at 15～10 a,in which the average growth is 1900 plnats per hm2 and 2000 plants per hm2?Competition is'nt clear below 10 years.In order to raise harvest quantity and reduce cost the optimum initial density obtained is between 1700 and 2000 plants per hm2?Afforestation at that design density can produce free ecotype place.It is helpful for development of diversity and creating favorable condition for complex management.