川北植烟土壤有效态微量元素含量评价及其分布特征

为探明川北植烟区土壤有效态微量元素含量状况及分布特征,对广元市228份植烟土壤有效铁、锰、铜、锌、钼及硼含量进行综合评价,并分析其在不同植烟区域、土壤类型及海拔段的分布特征。结果表明:川北植烟区土壤有效铁总体上处于丰富或极丰富水平,平均含量为65.42 mg·kg^-1;有效锰、铜及钼总体上处于中等以上水平,平均含量分别为31.79、1.65和0.15 mg·kg^-1;有效锌和有效硼总体处于缺乏或极缺乏水平,平均含量分别为0.90和0.19 mg·kg^-1。土壤有效铁、锰、铜、钼平均含量在旺苍县较高,而有效锌和硼在剑阁县较高。有效铁平均含量在黄壤较高,有效锰、锌、钼在黄棕壤较高,而有效铜和硼在潮土较高。有效钼和硼平均含量在各海拔段无明显差异,有效锰随海拔升高而增加,有效铜和锌在高海拔处(1 100 m)较高,而有效铁在低海拔处(500~700 m)较高。

Evaluation on content and distribution characteristics of soil available microelements in tobacco growing area in Northern Sichuan

In order to investigate the content status and distribution characteristics of soil available microelements, such as Fe, Mn, Cu, Zn, B, Mo, in tobacco growing area, 228 soil samples were selected from Guangyuan City in northern Sichuan for analysis. Meanwhile, the distribution characteristics of the above microelements on the function of tobacco growing area, soil type and altitude were analyzed. It was shown that the soil available Fe was at the rich or extremely rich level with the average content of 65.42 mg·kg^-1. Soil available Mn, Cu and Mo were over the medium level with the average content of 31.79, 1.65 and 0.15 mg·kg^-1, respectively. Soil available Zn and B were at the poor or extremely poor level with the average content of 0.90 and 0.19 mg·kg^-1, respectively. Soil available Fe, Mn, Cu and Mo exhibited higher average content in Wangcang County, while soil available Zn and B were higher in Jian??ge County. The average content of soil available Fe was higher in yellow soil, and Mn, Zn and Mo were higher in yellow brown soil, yet soil Cu and B were relatively higher in fluvo-aquic soil. The average content of Mo and B showed no significant difference among different altitudes. Soil available Mn content increased with the elevated altitude. Soil available Cu and Zn contents were higher over 1 100 m, while soil available Fe was higher in lower altitude (500-700 m).