树冠及叶凋落物对模拟酸雨缓冲能力的初探

用模拟试验的方法,对树冠、叶凋落物和鲜树叶缓冲酸雨的能力进行研究。结果表明,阔叶树比针叶树缓冲能力大;树叶汁液pH高的比低的缓冲能力大;阔叶树面积的大小,与缓冲能力成正比;针叶则相反。在pH2.0、3.0的处理中,它们的缓冲能力排序为:叶凋落物>鲜树叶>树冠。在pH4.5时,则是叶凋落物>树冠>鲜树叶。

Preliminary Studies of the Buffering Effect of Tree Growns and Leaf Litter on Simulated Acid Rain

The studies of the buffering effect of crown, leaf litter and live leaves on acid rain were carried out with simulation methodology. The results show that buffering ability of broadleaf trees was greater than that of conifers, that tree species with higher leaf juice pH values are more capable of buffering acid rain than those with lower leaf juice pH values, and that the ability of braodleaf tree species is directly proportional to the area of leaves. As to conifers, however, the ability of tree species with larger leaf areas tends to be smaller. The order of buffering ability of different materials at pH2.00 and 3.00 was found to be: leaf litter>live leaves>crown, while at pH4.50 the order is leaf litter> crown> live leaves.