长期施钾对湖北省几种土壤粘土矿物组成影响的初步研究

Preliminary study of effect of long term potassium applicationon clay mineral association of soils in Hubei Province

对耕层土壤的粘粒进行X 射线衍射分析结果表明,无论是10 年不施钾或是10 年连续施钾,同一土壤的粘土矿物组成表现出相同的变化趋势:麻砂泥田粘土矿物组成中,水云母含量下降,1-4 nm 矿物含量相应上升,类型由以蛭石为主转变为以1-4 nm 过渡矿物为主,且1-4 nm 过渡矿物的热稳定性有所增强,这主要是由于土壤钾、镁等营养元素长期“入不敷出”所致;白散泥田土壤粘土矿物组成变化不明显;灰油砂土粘粒中,水云母含量上升,1-4 nm 矿物相应下降,这可能主要是粗粒云母类矿物在表层风化的结果。

The study by means of X ray diffraction analysis were analysed the clay in arable layer soil.Results indicated that,clay mineral association of the same type of soil showed the same changing tendency whether potassium was applied or not.In the clay of brown reddish paddy soil,the content of hydro mica tended to decresae,and that of 1 4nm mineral correspondingly tended to increase which dominated from vermiculite to 1 4nm intergrade mineral,what's more,the thermal stability of 1 4nm intergrade mineral tended to strengthen;The clay mineral association of yellow brownish paddy soil was rather stable;In the clay of gray fluvoaquic soil,the content of hydro mica tended to increase which was mainly resulted from the weathering of macroscopic micas in topsoil.