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为研究酸雨对不同pH值土壤农田系统呼吸的影响,选择酸性(pH 5.48)、中性(pH 6.70)、碱性(pH 8.18)水稻土,以冬小麦为实验对象在2005~2007年期间进行了盆栽实验.种植期间利用雨水T1(pH 6.0)、T2(离子浓度为T1的2倍,pH 6.0)、T3(离子浓度为T1的2倍,pH 4.4)进行喷淋,并采用静态暗箱-气相色谱技术测定农田系统暗呼吸速率.结果表明,酸雨通过影响农作物的呼吸过程而对农田系统暗呼吸产生影响,且农田系统可适应酸雨污染.2005~2006年,酸雨提高了碱性土壤(S3)农田系统平均暗呼吸速率,S3T3分别比S3T1、S3T2高23.6%2、7.6%(p<0.05),但对酸性土壤(S1)和中性土壤(S2)农田系统平均暗呼吸速率无显著影响(p>0.05).在3~4月,雨水离子浓度升高可促进酸性土壤农田系统暗呼吸,雨水pH值降低可抑制酸性土壤农田系统暗呼吸.结果证实,在酸雨对农田系统暗呼吸影响过程中,土壤酸碱性、农作物发挥了重要作用.
In order to study the effect of acid rain on the respiration of farmland system with different pH values, the soil types of acidic (pH 5.48), neutral (pH 6.70) and alkaline (pH 8.18) paddy soil were chosen to study the winter wheat from 2005 to 2007 Pot experiments were carried out using rainwater T1 (pH 6.0), T2 (twice the concentration of T1, pH 6.0), T3 (twice the concentration of T1, pH 4.4) The results showed that acid rain influenced the dark respiration of farmland system by influencing the respiration process of crop plants, and the farmland system could adapt to the acid rain pollution. From 2005 to 2006, acid rain increased the content of alkaline soil (S3) The average dark respiration rate of farmland system was S3T3, which was 23.6% higher than that of S3T1 and S3T2 by 2 and 7.6%, respectively (p <0.05), but had no significant effect on the average dark respiration rate of farmland system in acid soil (S1) and neutral soil (S2) p> 0.05) .In March ~ April, the increase of rain ion concentration could promote the dark respiration of farmland system in acidic soil, and the decrease of pH of rainwater could inhibit the dark respiration of farmland system in acid soil.The results showed that under the influence of acid rain on the dark respiration of farmland system In the soil acid-base, the crop has played an important role .