不同海拔高度植烟土壤有效钙镁的分布状况--以云南曲靖烟区为例

Distributions of Available Ca and Mg Contents in Tobacco Soil at Different Altitudes——A Case Study of Tobacco-growing Area of Qujing in Yunnan

为探明不同海拔高度植烟土壤有效Ca、Mg的差异和分布状况,采集了2552个曲靖烟区1300～2300m海拔高度土壤样品,利用数理统计和地统计学方法对其有效Ca、Mg进行了研究。结果表明:曲靖烟区土壤有效Ca、Mg含量平均为2640.86mg/kg、314.26mg/kg。中海拔地区土壤有效Ca含量最高,低与较低海拔地区土壤有效Ca含量适宜,高与较高海拔地区土壤有效Ca含量处于低水平范围内。随着海拔高度的增加,土壤有效Mg含量递减。低与较低海拔地区土壤有效Mg含量过高,其他地区适宜。土壤有效Ca、Mg含量与海拔高度呈极显著负相关。较低和低海拔地区土壤Ca/Mg比值显著低于其他地区,中海拔地区Ca/Mg比值最大。土壤有效Ca与有效P呈极显著负相关,与其他土壤养分指标呈极显著正相关,有效Mg与碱解N、有效P呈显著负相关,与其他土壤养分呈极显著正相关。曲靖烟区土壤有效Ca含量从东往西逐渐下降,有效Mg则是南北高,中间低,Ca/Mg比值在东部地区较大,而南北部地区和西部地区较小。

In order to clarify the changes and distributions of available Ca and Mg contents in tobacco soil at different altitudes,in total 2 552 soil samples between 1300 m and 2300 m altitude in tobacco-growing region of Qujing were collected and analyzed by statistical analysis and geostatistics.The results showed that the mean contents of soil available Ca and Mg in tobacco-growing soil Qujing were 2 640.86 mg/kg and 314.26 mg/kg,respectively.The content of soil available Ca was highest in the middle altitude region,suitable at the low and lower altitude regions,but lower at the high and higher altitude areas.The content of soil available Mg declined with the increase of altitude.The content of soil available Mg was higher in the low and lower altitude regions but suitable in other regions.The contents of soil available Ca and Mg were correlated negatively with altitude.The ratio of Ca/Mg in the middle altitude region was highest,but significantly lower in the low and lower altitude regions than other regions.The available Ca was correlated negatively with available P,positively with other soil nutrients.The available Mg was correlated negatively with alkali-hydro nitrogen and available P,positively with other soil nutrients.The content of soil available Ca gradually declined from east to west in Qujing.Available Mg was higher in south and north regions but lower in middle region,the ratio of Ca/Mg was higher in east region but lower in south,north and west regions.