安徽岳西头陀镇毛竹林生产力与土壤养分特征比较

为了解土壤养分与毛竹生长的相关性，对安徽头陀镇的垦复毛竹纯林、未垦复毛竹纯林和竹阔混交林进行调查研究。结果表明院不同毛竹林生长及其生产力差异明显，平均胸径10.02耀12.35 cm，立竹度0.28耀0.49，该区的生产力属中等偏低，总生物量大小依次为院垦复毛竹纯林（96.50 t/hm2）>竹阔混交林（81.39 t/hm2）>未垦复毛竹纯林（78.17 t/hm2）。垦复毛竹纯林和竹阔混交林的各组分生物量大小依次为院竹杆>竹鞭>竹根>竹叶>竹枝；而未垦复毛竹纯林为院竹杆>竹枝>竹鞭>竹根>竹叶。不同林分下，各样地土壤有机质、全氮、速效磷和速效钾含量均随土层深度的加深而降低，同一土层中养分含量差异显著。相关分析显示，不同毛竹林总生物量与土壤有机质、全氮和速效磷存在不同程度的正相关；平均胸径与0耀20 cm 土层有机质和速效磷呈显著正相关；立竹度仅与0耀20 cm 土层有机质呈正相关。说明土壤有机质含量是影响毛竹生产力的关键因素。

Characteristics comparison of productivity and soilnutrient of Phyllostachys pubescens forestin Toutuo of Yuexi county, Anhui

In order to understand the relationship between soil nutrient and growth of Phyllostachys pubescens, aninvestigation was conducted to study the tending, non -tending pure P. pubescens stands, and P. pubescens andbroadleaved mixed stand in Toutuo of Yuexi county, Anhui province of China. The results showed that there existedsignificant differences in growth and productivity of P. pubescens among the different stands. The mean diameter at thebreast height (DBH) was from 10.02 to 12.35 cm. The mean stand density indices were ranged from 0.28 to 0.49. Theproductivity of P. pubescens stands in Toutuo was mediun to low. The total biomass of the tending stand (96.50 t/hm2)was the highest, followed by the mixed stand (81.39 t/hm2) and non tending stand (78.17 t/hm2). The biomass partition ofboth the mixed stand and the tending stand were ordered as stem>rhizome>root>foliage>branch, while the non-tendingstand was ordered as stem>branch>rhizome>root>foliage. The concentrations of organic matter, total nitrogen, availablephosphorus and potassiun in the different stands decreased with soil depth increasing. There was significant difference innutrient concentrations in the same soil layer among the different stands. Correlation analysis demonstrated that the totalbiomass of different stands was positively correlated with soil organic matter content, total N, and available phosphorus.The mean DBH had a significant and positive correlation with organic matter content and available phosphorus in 0-20cm soil layer, and mean stand density indices had asignificant and positive correlation with organic matter in0 -20 cm soil layer. This suggests that soil organicmatter content is the key factor affecting bamboo P.pubescens stand productivity.