安徽毛竹林生产力与土壤养分关系分析

采用常规的样地调查法,对安徽6个主产地的毛竹林土壤养分与生产力关系进行调查分析。结果表明,不同产地毛竹林生长及其生产力水平差异明显,林分平均密度为2 298～3 496株.hm-2,平均胸径9.0～10.8 cm,平均立竹度0.21～0.34,林分生物量54.7～94.6 t.hm-2;土壤容重多数在1.20 g.cm-3以上,有机质含量25.6～40.2 g.kg-1,全氮1.62～4.56 g.kg-1,全磷0.61～0.92 g.kg-1,有效氮56.5～78.8 mg·kg-1。相关分析显示毛竹林生物量与土壤有机质、全氮、全磷和全钾呈显著正相关,立竹度与土壤有机质、土壤全磷和全钾呈显著正相关。改善土壤物理性、提高土壤肥力特别是有机质含量是促进毛竹林优质丰产的重要措施。

Relationship between productivity and soil nutrient of Phyllostachys pubescens forest in Anhui

The productivity of Phyllostachys pubescens stands and their soil nutrients at the six main distribution areas in Anhui were studied using the conventional plot survey method. The result showed that there existed significant difference in growth and productivity of Phyllostachys pubescens stands amongst the different main areas. The mean densities were from 2 298 to 3 496 culms·hm^-2 with the mean DBH from 9.0 cm to 10.8 cm. The mean stand density indices were ranged from 0.21 to 0.34. The stand biomass averaged from 54.7 to 94.6 t·hm^-2. The properties of soils under the Phyllostachys pubescens stands differed significantly at different sites. The mean bulk densities for most soils were over 1.20 g·cm^-3. The mean concentrations of soil organic matter ranged from 25.6 to 40.2 g·kg^-1, and the total N from 1.62 to 4.56 g·kg^-1, total P from 0.61 to 0.92 g·kg^-1, available N from 56.5 to 78.8 mg·kg^-1. Results from the regression analysis showed that the biomass of Phyllostachys pubescens stand was significantly and positively correlated with soil organic matter, total N, total P and total K (p < 0.05). The stand density index was significantly and positively correlated with soil organic matter, total P and total K (p < 0.05). This suggests that to decrease soil bulk density and to increase organic matter content are the important measures for promotion of the high-quality and productivity of Phyllostachys pubescens stands.