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以黄河三角洲莱州湾柽柳次生灌木生态林为对象,选取林分生长和土壤理化性状等24项指标,采用综合因子法研究柽柳林低效的主要影响因子和低效林划分的主要参数.结果表明:柽柳树木生长指标与反映土壤质量状况的主要指标相关性不明显,仅依据树木的生长状况不能反映柽柳林的低效程度,需采用树木生长和土壤改良指标来综合判断.土壤含盐量、林龄、土壤含水量、单株地上茎和叶生物量及地径是反映低效柽柳林分质效高低的主要指示因子,其次为土壤容重、孔隙度及土壤养分特征.莱州湾柽柳低效林可划分为生长潜力型、轻度低质型、中度低效型、中度低质低效型和重度低质低效型5大类型.依据聚类分析的类平均值探讨了其林分特征、低效原因及经营改造方法.
Twenty-four stands of Tamarix chinensis secondary shrubs in the Laizhou Bay of the Yellow River Delta were selected as indicators, and 24 indicators including stand growth and soil physical and chemical properties were selected to study the main influencing factors and the main parameters of inefficient forest classification. The results showed that there was no significant correlation between the indexes of Tamarix and tree growth and the main indexes reflecting the soil quality status. Only according to the growth status of trees, the inefficiency of Tamarix chinensis forest could not be reflected, and the index of tree growth and soil improvement should be used to judge synthetically. , Stand age, soil water content, biomass and diameter of above-ground stems and leaves of single plant were the main indicators to reflect the effect of low-yield Tilia mandshurica, followed by soil bulk density, porosity and soil nutrient characteristics. Lin can be divided into five types of growth potential type, mild low quality type, moderate low efficiency type, moderate low quality and low efficiency type, and severe low quality and low efficiency type.According to the class average of cluster analysis, Sub-characteristics, inefficient causes and management reform methods.