EFFECT OF CALCICUM ON MUSKMELON SEEDLING HARMED BY ACID RAIN
钙对酸雨伤害甜瓜幼苗的影响

The protective effect of calcium on muskmelon seedling harmed by acid rain was studied. When muskmelon seedlings were sprayed with 30 mmol/L CaCl 2 two times(once every 24h),the damage to muskmelon seedlings by acid rain at pH2 5 were reduced. The protective effect was because that CaCl 2 raised photosynthetic rate, chlorophyll content and Ca 2 content, increased catalase activity, decreased malondialdehyde content, reduced cell membrane permeability and kept stability of cell juice pH value of muskmelon seedlings, etc .