降尘促进酸雨对土壤—蔬菜的效应

Dust Promoting the Effect of Acid Rain on Soil Vegetable

酸尘降地区酸雨尚难在短期内单独致使水体和土壤酸化。降尘对土壤—蔬菜中的ＳＯ４ ２－、ＮＯ３ －、Ｃａ２＋ 和Ｈｇ有较大贡献。随着降尘量的增加，对应土壤中的全Ｓ、吸附态Ｓ和Ｈｇ 含量也相应增加，表现出高度正相关，但未达显著水平；ＮＯ３－表现为中度相关，Ｃａ２＋ 表现为弱相关。降尘土促进酸雨对蔬菜的危害，主要表现在多病害，且伴有虫害发生；蔬菜宜种度变窄，对酸沉降敏感的青菜、蕃茄等几乎绝种。钙质土对降尘和酸雨表现出对抗。

It is really that the water body and soil is not acidified by acid rain alone in a short term in the acid precipitation area.But dust produced a large contribution to SO 4 2 、NO 3 、Ca 2+ and Hg in soil and vegetable.The contents of total S,absorption S and Hg in soil increased with the increasing dust,and there is a positive correlation bteween them.Because the effect of dust and acid rain on vegetable growing disease,and insect increased,the better vegetable species became shorter,the Chinese cabbage and tomato nearly became extinct.The harm of dust and acid rain on vegetable was weaker in calcarious soil.