成都地区慈竹生长状况及其与环境因子关系的初步分析

通过对成都市城区边缘及郊区6个样地慈竹林竹株的实地观测和取样分析，发现成都市城区边缘及青白江区的慈竹普遍生长不良，不同竹龄竹株的高度和胸径都比无郊崇州市怀远的慈竹要小，发育不良竹株竹杆内硅的含量显著高，初步分析硅的过多积累可能是慈竹竹杆脆化的一个明显指标；发育不良的慈竹竹杆含水量也普遍比生长状况好的慈竹竹杆含水量高。从样地土壤样品分析发现，慈竹生长不良的样地土壤偏酸或者偏碱。成都市区的降水普遍偏酸，降水中过高的SO4^2-,NO3^-,Cl^-和F^-离子成分也可能是导致慈竹生长不良的环境因素。

Study on the Growth Status and Correlative Environment Factors of Bamboo, Neosinocalamus affinis from Chengdu Region

Through field investigation followed by experimental testing of water content,the elements of P,N and Si of bamboo samples from six plots at the outskirts,suburban and far suburban area of Chengdu city,the growth status of the bamboo species Neosinocalamus affinis (Rendle) Keng f.was primarily analyzed.The results indicated that,in general,the bamboo culms of each age group from poor-developed groves were shorter in height and smaller in DBH than relatively normal groves in the plot far away from the downtown of Chengdu.The contents of Si in culm samples from the poor-developed groves were much higher than that in those from normal groves.The content of Si in a bamboo culm of this species may be an index of fragility to which extent the culm is turning into.No more relationship was clear among the soil contents in the six plots and the growth situations of the bamboo except that the pH in soil of plots that habitat poor-developed groves is either slightly acidity or alkalinity.The rainfall of Chengdu city was relatively acidic and the high concentrations of SO 2- 4,NO - 3,Cl - and F - in rainfalls may also contribute to the poor-development of bamboo and the degradation of the groves.