退化低丘红壤新造毛竹林地上部分生物量的研究

A Study on Aboveground Biomass of Young Bamboo Stands of Phyllostachys Pubescens in Degenerative Hill Soil Area

以低丘退化红壤区新造毛竹林的促进生长提供科学依据为目标,在竹林林分结构年际变化和生态构件因子间相互关系的研究基础上,采用定位调查方法研究立竹年龄、径级对地上生物量的影响和生物量各组分间关系及其特征生态构件因子,结果表明:立竹胸径与竹林其它生态构件因子间呈极显著相关,与立竹度是新造毛竹林林分结构年际变化的主导因子。竹龄对竹林地上各器官含水率有不同程度的影响,2龄立竹竹秆、竹枝含水率较1龄立竹分别下降10.3%、9.4%,3龄始趋于相对稳定。2龄叶含水率较1龄叶含水率降低24.6%,相同叶龄竹叶含水率差异不显著。低丘红壤区新造毛竹林竹秆、竹枝、竹叶生物量与立竹径级呈一致性增长趋势,各组分生物量构成比例随径级无显著变化,大小顺序与其它土壤类型的毛竹林趋于一致,为竹材>竹枝>竹叶,而地上生物量的差异主要来源于竹林立竹平均胸径的差异。易于测量的立竹胸径与全竹干质量、竹材干质量显著相关,可作为毛竹林地上生物量分析的特征生态构件因子。

Aimed at growth promotion of young bamboo stands of Phyllostachys pubescens in degenerative hill area, based on the studies of change of bamboo stands structure year by year and relativity among bamboo stands structure factors, the paper has studied on the influences of bamboo culm age and diameter at breast height(DBH) on aboveground biomass through site investigation. The results show that DBH, which is the leading factor of young bamboo stands structure, has notable correlation with other bamboo stands structure factors;culm age has influences of different degrees on aboveground apparatuses water ratio of bamboo stands, the water ratio of two-year-old culm and branch are higher than those of one-year-old by 10.3%, (9.4%),respectively, water ratio of culm and branch of three-year-old and over is relatively stable. The water ratio of two-year-old bamboo leaf is lower than that of one-year-old by 24.6%,the difference of the water ratio is not notable in the same age bamboo leaves;the biomass of culm, branch and leaf of the young bamboo stands in degenerative hill red area has an increasing trend with DBH, the proportions of the biomass of the parts have no notable changes with DBH, sequence follows the rule of culm>branch>leaf,the difference of aboveground biomass mainly roots in DBH;DBH is biomass characteristic factor of bamboo stands, ntoable relativity with the biomass of stock and culm.