长期酸化对红壤中活性固相铝库大小及亏损程度的影响  

The Effect of Long-term Acidification on Size and Depletion of Reactive Solid-Phase Aluminum in Red Soils

作　　者：朱茂旭[1] 季国亮[2] 

机构地区：[1]中国海洋大学化学化工学院,山东青岛266003 [2]中国科学院南京土壤研究所,江苏南京210008

出　　处：《土壤通报》2004年第2期106-111,共6页Chinese Journal of Soil Science

基　　金：国家博士后科学基金;国家自然科学基金(49831005)资助项目

摘　　要：用连续分级提取和反复多次酸提取方法研究了长期土壤酸化对红壤固相铝库中铝含量及亏损程度的影响。研究结果表明:嵊县红壤的活性铝库大于永春红壤和屯溪红壤;因永春红壤和屯溪红壤的酸化程度大于嵊县红壤,前两者的有机铝库和无机铝库都比嵊县红壤的亏损,因此反复酸提取过程中铝的释放量也比嵊县红壤少;当高强度酸输入土壤后,弱键合的有机络合态铝可快速活化并亏损,剩余铝库因活性小而释放速率减小,但长期酸化过程中,动力学控制的低活性铝库的活化可能对铝的溶解量仍有重要贡献。A sequential dissolution technique and a prolonged extraction method were used to investigate the effect of long-term acidification on the sizes and depletion of various reactive solid-phase Al pools in red soils. The results show that the size of reactive solid-phase Al pool in Shengxian soil is larger than that in Yongchun soil and Tunxi soil. Due to a higher degree of acidification in the Yongchun soil and the Tunxi soil than that in the Shengxian soil, the depletions of both organically and inorganic ally bound Al in the former two soils are higher than those in the latter one, therefore,during a prolonged acid extraction the total amount of released Al from the former soils were smaller than that from the latter one. Under strong acid input fast release and sequential depletion of weakly bound organic Al may render the residual solid-phases a low Al dissolution rate. In the long term, however, kinetically constrained Al dissolution from strong bound organic and inorganic Al pools may have an important contribution to the amount of dissolved Al after quick depletion of weakly bound organic Al pool.

关 键 词：土壤酸化 红壤 活性固相铝库 亏损程度 

分 类 号：S153.4[农业科学—土壤学]