Effects of site conditions on the biomass of Phyllostachys bambusoides f. shouzhu Yi | 立地条件对寿竹生物量的影响

Chinese. 探讨立地条件对寿竹生物量的影响，确定寿竹生长的适宜立地条件，为寿竹的营林生产提供理论依据。在重庆市梁平县寿竹分布区选取16块样地，对样地的立地条件（坡度、坡位、坡向、海拔、土层厚度和腐殖质层厚度等）及寿竹标准竹的生物量进行调查，采用SPSS数理统计软件的t检验和多元回归分析方法，研究不同立地因子对寿竹生物量的影响。寿竹的生物量随坡度的增大而减小，平坦地和缓坡适宜寿竹生长；上坡不适宜寿竹的生长，中、下坡寿竹生物量差异不明显；坡向对寿竹生物量的影响不明显；海拔800 m是寿竹生长的一个分界线；土层越厚越有利于寿竹生物量的积累；腐殖质层厚度小于2 cm时不利于寿竹生长。上述立地因子中，坡位、土层厚度、腐殖质层厚度对寿竹生物量影响较大，海拔、坡度、坡向对寿竹生物量影响较小。影响寿竹生物量积累的主要立地因子是坡位、土层厚度、腐殖质层厚度。在寿竹营林生产中，林地应选择在海拔800 m以下的平缓坡地，坡位宜选择中、下坡；林地内应有一定厚度的土层和腐殖质层。

English. The study explored the effects of site conditions on the biomass of Phyllostachys bambusoides f. shouzhu Yi in order to ascertain the optimum site condition for the growth of P. bambusoides f. shouzhu Yi and provide theoretical foundation for forestation of the bamboo. The site conditions of slopeness, slope position, slope aspect, altitude, soil thickness and humus thickness, and the biomass of standard bamboo of P. bambusoides f. shouzhu Yi were investigated in 16 sample spots of bamboo forest of P. bambusoides f. shouzhu Yi in Liangping county, and then the effects of site conditions on the biomass of the bamboo were analyzed by the methods of t test and quantity regression by SPSS software. The biomass of P. bambusoides f. shouzhu Yi would decrease with the increase of slopeness, and the flat ground and the gentle slope were more suitable for its growth. The upper of a hill was not suitable for the bamboo growth, and the biomass difference of the bamboo was not significant between the mid and lower of a hill. The effect of slope aspect on the biomass of the bamboo was significant. The altitude of 800 m could be the boundary for the bamboo growth. The thicker soil was good for the accumulation of the bamboo biomass. The humus thickness less than 2 cm was not suitable for the bamboo growth. The site factors of slope position, soil thickness and humus thickness had significant effect on the biomass of P. bambusoides f. shouzhu Yi, but the effects of other factors on the bamboo biomass were lower. The main site factors affecting the biomass of P. bambusoides f. shouzhu Yi are slope position, soil thickness and humus thickness. The forestation site of P. bambusoides f. shouzhu Yi should be selected at the flat ground and the gentle slope of the hills below altitude of 800 m, and the slope postion of the forestation site shoud be selected at the mid and lower postion of a hill. Soil thickness and humus thickness should be kept at a suitable level in the forestation site.