【摘要】 对下、中、上3个不同坡位的糙花少穗竹(Oligostachyum scabriflorum)林的土壤养分和竹林主要养分分配格局的差异进行研究。结果表明:(1)各坡位糙花少穗竹林不同土层的土壤养分浓度均为下坡>中坡>上坡,同一坡位中,0-20 cm土层的养分显著高于另外2个土层,土壤有效养分主要分布在土壤的近表土层。(2)生物量大小均为下坡>中坡>上坡,坡位效应明显。(3)虽然1、2龄竹的秆枝叶的养分浓度略高于3、4龄竹,但各坡位糙花少穗竹同一龄级或同一土层的同一器官养分浓度差异很小,表现出一定的稳定性。同一器官养分浓度随坡位升高而略有下降;同一坡位,随土层加深,鞭根的养分浓度也略有下降,说明各器官养分浓度在环境因子变化时也会发生小幅度的变动。(4)各坡位各器官或各部分的养分含量明显表现出下坡>中坡>上坡的规律。更多还原

【Abstract】 Comparison of nutrient allocation of soil and bamboos in different slope positions in Oligostachyum scabriflorum forest showed that:(1)Soil nutrient concentrations ranked:lower slope>middle slope>upper slope.Nutrient concentrations in soil layer of 0-20 cm were larger than other soil layers in each slope position meaning that effective soil nutrients located at near surface layers.(2)Biomass also ranked:lower slope>middle slope>upper slope,affected by the slope position.(3)The same organs′ nutrient concentrations of the same age or at the same soil layer in different slope positions had small difference,showing the stability of organ′s nutrient concentration although the organ′s nutrient concentrations of 1 and 2 years bamboos were a little larger than that of 3 and 4 years.A little decrease of the same organs′ nutrient concentration in upper slope position compared with down slope,and a little decrease of the same organs′ nutrient concentration in deeper soil layer meant that the organ′s nutrient concentrations changed a little with the changing of environmental factors.(4)The nutrient contents of organs and total bamboos also ranked evidently:lower slope>middle slope>upper slope.更多还原