曲靖烟区土壤有效中量元素的空间变异特征及影响因子研究

为研究曲靖烟区土壤有效中量元素的空间分布特征及其影响因素,本文采用GPS技术在曲靖烟区采集2088个土壤样品,利用原子吸收分光光度法测定样品有效钙、有效镁和有效硫含量,利用地统计学和经典统计学分析了3种有效中量元素的空间变异特征及其影响因素,以为曲靖烟区土壤中量元素科学有效地分区管理及烤烟合理施肥提供依据.结果表明,曲...

SPATIAL VARIABILITY AND INFLUENCING FACTORS OF SOIL AVAILABLE SECONDARY ELEMENTS IN QUJING TOBACCO AREA, CHINA

To investigate the spatial distribution of soil available secondary elements Ca, Mg and S and its influencing factors, and provide a theory basis for management of secondary elements and fertilizing reasonably on tobacco, total 2088 soil samples were collected based on GPS technique. Available Ca, Mg and S were analyzed by Atomic Absorption Spectrometry. It addition, spatial variability and influencing factors of 3 secondary elements were studied. The concentrations of soil available Ca and Mg in Qujing tobacco area were moderate variability with the averages of 2579.2 and 323.0mg/kg, respectively. The concentrations of soil available S represented strong variability with the average of 37.6mg/kg. Soil available Ca, Mg and S were moderate spatial autocorrelations, and their spatial variability was caused by structural factors and random factors. Soil available Ca, Mg were high in most areas(96.5% and 96.0%) and soil available S was low (<16mg/kg) or too high (>50mg/kg)in some areas (0.70 % and 9.80%) in Qujing tobacco area. Altitude, terrain conditions, soil types, soil pH, organic fertilizer application rate and preceding crops were influencing factors of 3 secondary elements. Scientific management should be adopted to manage secondary elements in soil according to the status of secondary elements in different areas.