机构地区: 华南农业大学
出 处: 《中国生态农业学报》 2008年第3期550-554,共5页
摘 要: 采用室内淋溶的方法研究了模拟酸雨对果园土壤pH(H2O)、pH(KCl)、交换性酸(EA)、交换性铝(EAl)、可滴定酸度(BNC)等各形态酸的变化影响,并依据淋溶前后各形态酸的含量评价了土壤酸度的变化。试验结果表明:以土壤pH(H2O)值作为供试土壤酸化指标,pH≤4.5的模拟酸雨淋溶促进了土壤酸化,而pH≥5.5的酸雨淋溶缓冲了土壤的酸化;以土壤pH(KCl)值、交换性酸(EA)、交换性铝(EAl)或可滴定酸度(BNC)作为土壤酸化的指标,pH2.5的酸雨淋溶促进了土壤酸化,而pH≥3.5的淋溶处理缓冲了土壤的酸化,土壤酸度减弱。 Through limited indoor leaching, the effect of acid-rain on soil acidity under litchi orchard was studied, and selection criteria of appropriate soil acidification discussed in the context of the factors of soil acidity. The study shows that, using pH ( H2O) as an acidification index, acid-rain with pH 〈 4.5 leads to soil acidification, whereas acid-rain with pH ≥ 5.5 has a buffeting effect on soil acidification; Using soil pH (KCl) , exchangeable acidity (EA) , exchangeable aluminum (EAl) or titratable acidity (BNC) as acidification indices, acid-rain with pH 2.5 leads to soil acidification, but soil acidity decreases after leaching of acid-rain with pH ≥3.5.