The effects of soil solid components on soil sensitivity to acid deposition by sequential extraction method were studied. A multiple regression equation of soil sensitivity was set up on the basis of stepwise regressi...The effects of soil solid components on soil sensitivity to acid deposition by sequential extraction method were studied. A multiple regression equation of soil sensitivity was set up on the basis of stepwise regression analysis. The results showed that organic matter expressed dual effects that were decided by soil original pH value and exchangeable cation composition on acid buffering reactions. The hydrolysis of activated oxides was a very important proton buffering reaction when in low pH situation. The crystalline oxides also played a role in the buffering reactions, but the role was restricted by the rate of activation of oxides. Meanwhile, the results by stepwise analysis showed that factors that had significant effect on soil acid buffering capacity were content of montmorillite, soil original pH value, Al 0, Mn 0 and CEC in decreasing order. Finally, sixteen soils were classified into four types of sensitive with single index cluster and multiple fuzzy cluster analysis respectively.展开更多
Soil acidification negatively affects plant growth,soil microbial composition and diversity,and the sustainability of agricultural ecosystems.The primary sources of soil acidity include base cations(BCs)leaching loss,...Soil acidification negatively affects plant growth,soil microbial composition and diversity,and the sustainability of agricultural ecosystems.The primary sources of soil acidity include base cations(BCs)leaching loss,the weathering of aluminum-containing minerals,excess cation uptake by plants,and the transformation of nitrogen,carbon,and sulfur compounds by soil microorganisms.Soil acidity reflects the degree of soil acidification and is characterized by the active acidity(intensity factor)and exchangeable acidity(quantity factor),while soil acid buffering capacity(Acid-BC)(capacity factor)controls the degree and rate of soil acidification.Biochar,as an alkaline,porous and carbonrich matter,not only reduces soil active and exchangeable acidity but also enhances the Acid-BC.Having a variety of BCs and oxygen-containing functional groups(OFGs),biochar improves acidic soil mainly through liming effect,cation exchange,complexation,and precipitation reactions.Thus,to improve acidic soils,the application of biochar may be a better alternative than conventional liming materials.However,further studies into re-acidification of biochar-amended soil due to biochar aging,nitrification of excess fertilizer nitrogen and their interaction are still required by binding the mechanistic comprehension of biochar-to-soil interactions and prolonged field researches.展开更多
文摘The effects of soil solid components on soil sensitivity to acid deposition by sequential extraction method were studied. A multiple regression equation of soil sensitivity was set up on the basis of stepwise regression analysis. The results showed that organic matter expressed dual effects that were decided by soil original pH value and exchangeable cation composition on acid buffering reactions. The hydrolysis of activated oxides was a very important proton buffering reaction when in low pH situation. The crystalline oxides also played a role in the buffering reactions, but the role was restricted by the rate of activation of oxides. Meanwhile, the results by stepwise analysis showed that factors that had significant effect on soil acid buffering capacity were content of montmorillite, soil original pH value, Al 0, Mn 0 and CEC in decreasing order. Finally, sixteen soils were classified into four types of sensitive with single index cluster and multiple fuzzy cluster analysis respectively.
基金funded by National Key Research and Development Program of China(No.2022YFE0116300)National Natural Science Foundation of China(4217070510).
文摘Soil acidification negatively affects plant growth,soil microbial composition and diversity,and the sustainability of agricultural ecosystems.The primary sources of soil acidity include base cations(BCs)leaching loss,the weathering of aluminum-containing minerals,excess cation uptake by plants,and the transformation of nitrogen,carbon,and sulfur compounds by soil microorganisms.Soil acidity reflects the degree of soil acidification and is characterized by the active acidity(intensity factor)and exchangeable acidity(quantity factor),while soil acid buffering capacity(Acid-BC)(capacity factor)controls the degree and rate of soil acidification.Biochar,as an alkaline,porous and carbonrich matter,not only reduces soil active and exchangeable acidity but also enhances the Acid-BC.Having a variety of BCs and oxygen-containing functional groups(OFGs),biochar improves acidic soil mainly through liming effect,cation exchange,complexation,and precipitation reactions.Thus,to improve acidic soils,the application of biochar may be a better alternative than conventional liming materials.However,further studies into re-acidification of biochar-amended soil due to biochar aging,nitrification of excess fertilizer nitrogen and their interaction are still required by binding the mechanistic comprehension of biochar-to-soil interactions and prolonged field researches.
