山东省自然环境下土壤硼素有效性分析

THE ANALYSIS OF B AVAILABLITY IN SOILS UNDER NATURAL EVIRONMENT IN SHANDONG PROVINCE

成土母岩中硼的丰度及含硼矿物的稳定性是土壤有效硼含量的决定性因素;;而成土母质有效硼与土壤有效硼则更具直接的关系，其相关系数（ｒ）在０．３７－０．７１之间;;土壤有效硼含量与常年降雨量呈显著负相关;;土壤有机质与有效硼含量呈极显著正相关;;ｐＨ值对硼的有效性影响最大。硼的吸附量随ｐＨ上升呈直线增加;;随土壤物理性粘粒的增加，对硼的吸附量呈直线增加;;土壤碳酸钙对阴的吸附无明显的影响。

The B contents of mother rock and the stability of minerals which contain B are the determinaing factors of the available B contents in soils. The available B contents of mother materialhave more direct relation with the available B contents of soils. The correation coefficient (r) is 0.37-0.71. The available B contents of soils have remarkable negative correlation wth the perennialrainfall contents, and positive correlation wth the organic matters. The pH is the most important factorto affect the availability of B in soils. The absorption of B is increased with the pH and the physicalclay. There are not obvious effect between the contents of CaCO3 and the absorption of B in the soils.