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采用室内模拟实验,分析不同强度的酸雨下水稻土p H值、磷素的动态变化,探讨不同酸雨对水稻土磷素变化的影响。结果表明,当模拟酸度为3.5、4.5、5.5的酸雨淋溶40 d过程中,水稻土p H值没有显著影响,说明水稻土具有一定的缓冲能力。而水稻土中全磷变化不大,速效磷含量变化显著,呈现下降的变化趋势,且在一定酸度的酸雨(p H=5.5)淋溶下水稻土中速效磷含量最低。随酸雨酸度的增强,水稻土中微生物量磷和酸性磷酸酶活性均呈先增强后降低的趋势。研究揭示p H≥4.5的酸雨可以促进水稻土中微生物生物量磷活性,当酸雨p H>3.5时可以促进水稻土中酸性磷酸酶的活性;高酸度的酸雨(p H<4.5)对水稻土中微生物量磷有抑制作用,当酸雨p H≤3.5时可以抑制水稻土中酸性磷酸酶活性。
Indoor simulation experiments were conducted to analyze the dynamic changes of p H and P in paddy soils under different acid rain intensities, and the effects of different acid rain on the changes of phosphorus in paddy soil were discussed. The results showed that the p H value of paddy soil had no significant effect when the simulated acid rain was leached by acid rain of 3.5, 4.5 and 5.5 for 40 days, indicating that paddy soil had a certain buffering capacity. However, total phosphorus in paddy soils did not change much, and available phosphorus content changed significantly, showing a decreasing trend. Soil available phosphorus was the lowest in paddy soils with a certain acidity (p H = 5.5). With the increase of acid rain acidity, microbial biomass phosphorus and acid phosphatase activity in paddy soil first increased and then decreased. The results showed that acid rain with p H≥4.5 could promote microbial biomass P activity in paddy soils. When acid rain p H> 3.5, it could promote the activity of acid phosphatase in paddy soil. High acidity acid rain (p H <4.5) Microbial biomass phosphorus inhibition, when the acid rain p H ≤ 3.5 can inhibit acid phosphatase activity in paddy soil.