模拟酸雨影响下红壤中钴的释放行为研究

采用室内模拟酸雨淋溶土柱的方法,研究了酸雨影响下红壤中钴的释放特征与规律.结果表明,酸雨加速了红壤中钴的淋溶损失.酸雨作用下红壤中钴的释放随淋溶量的变化具有阶段性特点,但不同土壤之间其阶段性特点存在一定的差异.在实验所施的淋溶强度下,供试的4种红壤中有3种表现为前期阶段减小和后期阶段增大的规律性,1种表现为前期阶段减小,中期阶段增大和后期阶段减小的规律性.酸雨对红壤中钴释放的促进作用,在短期内有利于提高红壤钴的可给性,但长期的酸雨淋溶可导致红壤因钴的加速淋失而缺钴. 

Study on Release of Cobalt from Red Soils under the Impact by Simulated Acid Rain

A soil leaching column experiment was designed to investigate the release of cobalt from red soils under the impact by simulated acid rain.The results show that acid rain can accelerate the release of cobalt from red soils.Under the impact by simulated acid rain,there is a phase characteristic in the process of release of cobalt.But the phase characteristics of the release of cobalt are different among various soils.Under the experimental leaching intensity,the release of cobalt increases in the early phase and decreases in the later phase for 3 out of the 4 test red soils,while the release decreases in the early phase,increases in the medium phase and decreases in the later phase for the other test red soil.The impact of acid rain on the release of red soils can enhance the availability of cobalt in a short time,but in a long time it can lead to lack cobalt in red soils because of the mass losing of cobalt.