竹阔混交林阔叶树下土壤养分对毛竹生长的影响

在浙江省龙游县和庙山坞自然保护区研究了竹阔混交林阔叶树周围土壤养分空间分布及其与毛竹生长的相关性.结果表明:(1)竹阔混交林中阔叶树周围全竹、新竹平均胸径及新竹数存在带内差异和树种间差异,毛竹生长随距阔叶树基干距离增加而增加;(2)阔叶树周围不同环形带内土壤养分含量分布存在明显差异,且这种差异与其周围毛竹生长分布趋势一致;(3)不同阔叶树周围相同环形带内土壤养分存在显著差异,除了有机磷外其他养分均达显著或极显著水平;(4)阔叶树周围对新竹生长影响的各土壤因子从大到小依次为:全磷、速效氮、全氮、速效磷、有机碳、速效钾;(5)新竹平均胸径与阔叶树周围各土壤养分因子相关性可达显著水平,新竹平均胸径与全氮、全磷呈显著正相关,而与速效钾和C/N呈显著负相关,与各土壤参数交互因子相关不显著.

The Effect of Soil Nutrient Around Broad-leaved Trees on Phyllostachys edulis Growth in the Mixed Forest

The correlation between the spatial distribution of soil nutrient around broadleaved trees and the growth of Phyllostachys edulis was studied in Longyou county and Miaoshanwu Protective Zone of Zhejiang province.The results showed that the obvious differences of the mean DBH of all bamboo and new culms and the number of new culms existed in the different annular zone around the trees and in whole stand.The growth of Ph.increased with the distance from the broad-leaved trees.It also showed that the clear differences of soil nutrients were coincident with the distribution differences of Phyllostachys edulis in the different annular zones around the same tree.The mean DBH of new culms increased with the higher content of soil nutrient.The evident differences of soil nutrients were seen in the same annular zones of different broad-leaved trees.Except the organic phosphorus,all of the soil nutrient factors reached the obvious level(p<0.05) or best obvious level(p<0.01).The grey correlation analysis between the mean DBH of new culms and soil nutrient around trees showed that the influence order of soil nutrients on new culms was total phosphorus,soluble nitrogen,total nitrogen,soluble phosphorus,organic carbon,soluble kalium.The analysis also showed that the relationship between the mean DBH of new culms and all soil nutrients was obvious(p<0.05).