不同坡向坡位对毛竹林生长及土壤因子的影响

Effects of different slope positions on the growth of Phyllostachys pubescens and soil factors

为了探明桃江地区不同坡向坡位对毛竹林生长及土壤因子的影响,对不同坡向坡位毛竹林生长情况调查,土壤因子分析以及毛竹林林分生长指标与土壤因子指标相关性进行分析,结果表明:阳坡地毛竹林林分生长较好,相比较阴坡地,立竹度高,平均胸径低,株高稍高,而枝下高相差不大,毛竹林的生长指标由上坡至下坡逐渐转好,坡向是影响立竹度和平均尖削度主效因子,而且坡位也是影响平均尖削度的显著因子,但是交互作用不明显;阳坡地毛竹林分生物量较大,毛竹凋谢物较多,土壤因子指标明显较高于阴坡地,该时期水解氮和全氮平均值分别达到了100 mg/kg左右和2 g/kg左右,土壤速效磷含量保持在8 mg/kg左右,土壤速效钾含量处于中等偏上的状态(高于60 g/kg),平均值在70 g/kg以上,下坡土壤因子指标含量明显高于上坡和中坡,坡向是影响速效磷和有机质的显著因子,坡位是影响速效钾的显著因子,是影响有机质的主效因子,两个影响因子在同一水平上交互作用不明显;水解氮与平均株高呈显著相关;速效磷与平均尖削度显著相关;速效钾与立竹度极显著相关,与平均株高显著相关,与平均胸径呈负显著相关;有机质与平均株高显著相关,与平均胸径负显著相关,与立竹度极显著相关。

In order to explore the different slope position and influence on the growth of Phyllostachys pubescens and soil factors in Taojiang area,through the different direction and position of slope Phyllostachys pubescens growth survey,factor analysis and analysis of soil of bamboo forest growth index and growth index of soil factor correlation found better compared to the sunny bamboo forest,bamboo shade,high,average at low height is slightly higher,and branch height difference,Phyllostachys pubescens＇ s growth index by up to the downhill slope is gradually improved,the average effect of bamboo and the average taper main effect factor,and slope position also affect significantly the average taper factor,but the interaction is not obvious; sunny hair forest biomass is larger,more bamboo withered,index of soil factor is significantly higher than that of shady,hydrolysis nitrogen and total nitrogen in this period the average value reached about 100 mg / kg and 2 g / kg,the content of soil available phosphorus is maintained at about 8 mg / kg,soil available potassium content in the medium state（ above 60 g / kg）,the average value is over 70 g / kg,slope soil factors are significantly higher than that in the uphill and the slope,the slope is a significant factor in available phosphorus and organic matter,slope position is the significant factor affecting potassium,and is the main factor affecting organic matter,the effect of two factors on the same level of interaction is not obvious; the hydrolysis nitrogen and the average plant height is significantly correlated,available phosphorus and the average taper is significantly related; available potassium and the average density is significantly correlated with the average strain. High significant correlation is negatively correlated with the average DBH; organic matter is signif-icantly correlated with average plant height,significantly correlated with DBH negative,significantly correlated with the average density.