甘州区农田耕层土壤微量元素分布空间变化研究

Spatial Variability of Soil Trace Elements Distribution in Cultivated Field in Ganzhou District

通过分析甘州区农田耕层土壤微量元素（Fe、Mn、Cu、Zn、B）的空间分布,从水平与垂直方向对全区农田耕层土壤微量元素含量特征进行研究,并对照全国土壤微量元素有效态含量分级标准得出全区各乡镇耕层土壤微量元素含量丰缺情况。主要结论如下：在0～5、5～10、10～20 cm土层水平方向上,土壤各有效态微量元素分布特征差异较大,主要表现为西北向东南逐渐减小和中间低四周高的特征。从垂直方向来看,全区土壤有效铁、有效锌平均含量随着土层的加深呈缓慢增加的趋势;土壤有效铜、有效硼平均含量均表现为随着土层的加深而减小;土壤有效锰平均含量的趋势为上下层高,中间层低;个别乡镇的土壤微量元素垂直分布特征与全区存在差异。全区大部分乡镇土壤有效铁、有效锰、有效铜、有效锌含量属于适中水平;土壤有效硼含量属于缺乏水平。建议今后在种植中应向该区土壤施入硼肥。

Through analyzing spatial distribution of soil trace elements（Fe, Mn, Cu, Zn, B） of topsoil infarmland in Ganzhou District, the author took a research on the content of soil trace elements in the wholeregion from both horizontal and vertical directions, and drew a conclusion about the sufficiency and deficiencysituation of the content of soil trace elements in this area by comparing them to the national soil trace elementstandards. The main conclusions were as follows： in the horizontal direction of 0-5, 5-10, 10-20 cm soil layer,the distribution characteristics of soil trace elements were quite different, the main characteristics showed thatthere was a decreasing trend of soil trace elements distribution from northwest to southeast and low in themiddle and high on all sides. From the vertical direction, the average content of soil available Fe and Znshowed a slow upward trend with the increase of soil depth; the distribution of the average content of soilavailable Cu and B decreased with the soil depth increase; soil available Mn was high in both top and bottomlayer and low in middle layer; the vertical distribution characteristics of trace elements in some towns weredifferent from the whole region. The contents of soil available Fe, Mn, Cu, Zn in most of the towns were atmoderate level, soil available B belonged to deficiency level. The author suggested that B fertilizer should beapplied in this area for future planting.