石灰石和菱镁矿对酸化森林土壤修复作用的研究

以重庆铁山坪马尾松林下典型的酸化土壤为修复介质,将土壤溶液pH值和主要阴阳离子浓度作为测试指标,对石灰石和菱镁矿这2种化学修复剂的修复效果进行了为期1a的野外实验研究.结果表明:与未投加修复剂的土壤相比,投加石灰石和菱镁矿后土壤溶液的pH值和相应阳离子(Ca²⁺或Mg²⁺)浓度显著上升,而且无机单体铝(Al_i)浓度明显下降,从而起到了缓解土壤酸化并降低其对植被危害的效果.但是,修复剂的投加导致NO₃^-

Effect of Limestone and Magnesite Application on Remediation of Acidified Forest Soil in Chongqing,China

Effect of limestone and magnesite application on remediation of a typical acidified soil under a masson pine(Pinus massoniana) forest at Tieshanping,Chongqing in southwest China was studied through field experiments.The changes of soil water chemistry in different layers within one year after application of limestone or magnesite indicated that the remediation agents leaded to the recovery of acidified soil by significant increase of pH value and concentration of relative cation,i.e.Ca²⁺ or Mg²⁺,and notable decrease of inorganic monomeric aluminum(Al_i).However,the accelerated leaching of NO₃^- and SO₄^2- might somewhat counteract the positive effects.Since the limestone powder applied was much finer and thus more soluble than the magnesite powder,it seemed that the addition of limestone was more effective than that of magnesite.However,the application of magnesite could probably improve the nutrient uptake and growth of plant,and thus limestone and magnesite should be used together.The change of soil water chemistry was much more notable in upper layer of soil than lower,which means that it will take long time to achieve the whole profile soil remediation.