赤红壤对模拟酸雨缓冲能力的研究

通过模拟酸雨的淋溶实验,引入绝对缓冲量和相对缓冲量的概念,分析了赤红壤对酸性降水的缓冲能力及其变化.认为赤红壤本身酸性较强,主要通过阳离子交换反应和氢氧化物的溶解反应发挥缓冲作用.对pH3.5以上的酸雨具有稳定的缓冲能力,淋入酸雨pH3.0以下时,对土壤的缓冲机制有一定损害,使缓冲能力逐渐下降,但下降的速率随淋溶程度的加深而趋缓.

BUFFER CAPACITY OF LATERIC RED EARTH TO SIMULATED ACID RAIN

Two indices are raised to estimate and compare soil buffer capacity to acid rain: Absolute BufferCapacity (ABC)and Relative BufferCapacity(RBC.)Lateric red earth is strong acid soil, andthe reactions of cateon exchange and dissolution of aluminium hydroxides are chhief buffer process of the soil. The result of leaching experiments shows that lateric red earth has stable buffer ca-pacitty to acid rain of pH>3.5,yet acid rain of pH<3.0can damges soil bufer mechanism and declines soil bufer capacity. Nevertheless,the rate of declination alleviates as the intensity of leaching rises.