模拟酸雨对三峡库区土壤中铝溶出及不同土壤缓冲性能的影响

采用室内模拟酸雨土柱淋溶实验,研究了酸雨对三峡库区4种典型土壤铝离子的淋失规律。研究表明,长时间受酸雨淋洗,土壤对酸雨的缓冲性能降低,且酸雨pH值越低,对土壤酸化影响越大。土壤铝离子的淋溶量随酸雨pH值下降而上升,在pH≥3.5的酸雨作用下,土壤中铝离子的淋溶量较少;而当酸雨pH=2.50时,铝离子的淋溶量骤然升高;同时,经酸雨淋洗后土壤中交换性铝的含量发生了改变(红棕紫泥除外),酸雨pH值越低变化越明显。

Effects of simulated acid rain on the release of Al~(3+) in typical soils from Three Gorges Reservoir region

The releasing pattern of Al3+ in different horizons in four types of typical soils,which samples were collected from the Three Gorges Reservoir Region,is studied by simulated acid rain leaching of soil columns equipment indoor.The results indicate that the buffering capacity of the tested soils against acid rain is weakened after a long time of leaching,and acid rain of a lower pH presents a stronger impact on the acidification of the soil.The leaching amount of Al3+ in four types of typical soils increases...