Authors: Xingmei Liu Jian Zhou Wanlu Li Jianming Xu Philip C Brookes
Publish Date: 2014/02/01
Volume: 21, Issue: 10, Pages: 6623-6631
Abstract
Our aim was to test the effects of simulated acid rain SAR at different pHs when applied to fertilized and unfertilized soils on the leaching of soil cations K Ca Mg Na and Al Their effects on soil pH exchangeable H+ and Al3+ and microbial community structure were also determined A Paleudalfs soil was incubated for 30 days with and without an initial application of urea 200 mg N kg−1soil as nitrogen N fertilizer The soil was held in columns and leached with SAR at three pH levels Six treatments were tested SAR of pH 25 40 and 56 leaching on unfertilized soil T1 T2 and T3 and on soils fertilized with urea T4 T5 and T6 Increasing acid inputs proportionally increased cation leaching in both unfertilized and fertilized soils Urea application increased the initial Ca and Mg leaching but had no effect on the total concentrations of Ca Mg and K leached There was no significant difference for the amount of Na leached between the different treatments The SAR pH and urea application had significant effects on soil pH exchangeable H+ and Al3+ Urea application SAR treated with various pH and the interactions between them all had significant impacts on total phospholipid fatty acids PLFAs The highest concentration of total PLFAs occurred in fertilized soils with SAR pH56 and the lowest in soils leached with the lowest SAR pH Soils pretreated with urea then leached with SARs of pH 40 and 56 had larger total PLFA concentrations than soil without urea Bacterial fungal actinomycete Gramnegative and Grampositive bacterial PLFAs had generally similar trends to total PLFAs
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