双闸调控机制:土壤溶解性铝释放的一种理论模型

DOUBLE—TAP CONTROL MECHANISM: A THEORETICAL MODEL FOR THE RELEASE OF ALUMINIUM IN SOILS

土壤中溶解态铝的含量,主要受固态铝的风化水解反应和溶解铝的聚凝共沉反应两种过程的控制.当pH>4.5时,溶解铝的含量对pH有极强的响应;在pH为4.0～4.5时,铝对pH的响应最弱;当pH<4.0后,响应程度又有所提高。

There are two taps controlling the release process of aluminium in soils: the hydrolysis of aluminium hydroxides and the coagulation of soluble aluminium With soil colloid. The responsibility of soluble aluminium to pH has two turning points. The soluble aluminium responds strongly to the change of pH when soil ph>4.5, which is the first tap of the controller. Its responsibility becomes very weak when soil pH<4.5, which is the second tap of the controller. However, the responsibility slightly increased when pH<4.0.