湖北省黄棕壤若干微量元素环境地球化学特征

摘要

在湖北省黄棕壤上采集32个土样，研究了微量元素B、Mn、Fe、Cu、Zn和Mo的总含量、有效态含量、它们在土壤剖面中的迁移分布等环境地球化学特征及其影响因素。所得结果如下：（1）湖北黄棕壤B、Mn、Fe、Cu的总含量较丰富，Zn的总含量中等，Mo的总含量缺乏；B、Cu、Zn、Mo的有效态含量较缺乏；（2）各微量元素总含量在黄棕壤剖面中的分布均以心土层中最高，而有效态含量均以表土层中最高；（3） Zn、Mo的有效态含量与总含量呈显著或极显著正相关；B、Mo的有效态含量与黄棕壤pH值呈极显著正相关，Fe、Zn有效态含量则与pH值呈显著负相关；除Fe外其他微量元素的有效态含量均与土壤有机质含量呈显著或极显著正相关。%Some microelements, such as B, Mn, Fe, Cu, Zn, Mo, etc., are regarded as essential elements to both animals and plants. But applying fertilizer blindly to soils can cause both waste and environmental pollution. In this paper, 32 soil samples were collected and the environmental geochemical characteristics of the aforementioned 6 kinds of microelements were studied in the yellow brown soil, which has the largest distribution area in zonal soils of Hubei Province. The main results are as follow: (1) B、Mn、Fe and Cu are relatively high in total contents, but Mo is lower. The available B、Cu、Zn and Mo are all insufficient. (2) All the microelements are the highest in total content in the subsoil and the highest in available form in the epipedon. (3) The positive correlation between the contents of total and available Zn & Mo arrives to significance or extreme significance level. The positive correlation between the contents of available B & Mo and pH of the yellow brown soil is proved to be of extreme significance. But for Fe & Zn, the negative correlation is also the same level.The contents of all available microelements except for Fe have significant of extreme significant positive correlation with the organic matter content in the soil. The authors think it necessary to plough deeply and apply organic fertilizer to improve the contents of available microelements in the yellow brown soil.