坡耕地植烟土壤酸碱度和中量元素的空间变异及其适宜性评价

Spatial Variability and Suitability Evaluation of Acid and Secondary Elements in Tobacco Planted Soil from Slope Farmland

试验采集重庆市武隆县坡耕地烟区土壤样品312个,对土壤样品的酸碱度、中量元素含量进行测定,并采用修正的内梅罗公式对采样区域的土壤质量进行评价。结果表明:武隆县烟田土壤pH值、交换性Ca、交换性Mg、有效S的含量的平均值分别为5.82、2.50 g/kg、0.15 g/kg和31.49 mg/kg。根据全国第二次土壤普查养分分级标准,pH值、交换性Mg含量总体上处于中等偏低水平,交换性Ca、有效S含量总体上处于较丰富状态。土壤pH值变异较小,有效S变异较大,交换性Ca、Mg变异居中。综合评价植烟土壤质量指数为1.81,适宜性等级为适宜。

312 soil samples were collected from tobacco planted area in slope farmland in Wulong County of Chongqing city,and their pH and secondary element content were measured,and then the modified Nemero formula was adopted to evaluate quality of the soil samples.The results showed that the average value of soil pH,exchangeable Ca content,exchangeable Mg content and effective S content in tobacco soil in Wulong county was 5.82,2.50 g/kg,0.15 g/kg and 31.49 mg/kg,respectively.According to the nutrient classification standards of second national soil survey,the pH and the exchanging Mg content of the soil samples are in a middle level or slightly lower in general,the exchangeable Ca content and the effective S content are in a rich level in general;variance in soil pH is little,variance in effective S content is relatively larger,and variance in exchangeable Ca content and exchangeable Mg content are moderate.The quality index of tobacco soil is 1.81 through a comprehensive evaluation,which is basically suitable for tobacco planting.