论文部分内容阅读
立地是林木生长环境因子的综合.立地质量好坏对林木产量有重大影响.鉴定林木立地质量是因地制宜营林的前提和依据.过去评定林木立地质量多采用地位级法,但它不适用于下层间伐后的林分;而当前应用比较广泛的立地指数表,又不适用上层间伐和“拔大毛”式采伐的林分.为此,本文试将地位级表和立地指数表结合在一起,编制了天山中东部雪岭云杉林立地等级表.一、资料来源和调查方法编表资料来源分为两部分,一是1985年
Site is the growth of environmental factors integrated forest site quality has a significant impact on forest yield.Forest stand quality assessment is based on the premise and basis for the management of forest in the past to assess the quality of forest stand-level method to use more, but it does not apply to the lower After the thinning of the stand; and the current application of a more extensive site index table, and does not apply the upper thinning and “pull big hair” type of logging stand.To this end, the status level table and site index table combination of preparation, preparation The Tianshan Mountains in the middle of the snow ridge spruce forest site rating scale I. Sources and methods of survey data source is divided into two parts, one in 1985