Effects of Amorphous Aluminum Hydroxide Addition on Soil Organic Nitrogen Mineralization in Acid Phyllostachys praecox Soils
In order to understand the effect of active aluminum induced by soil acidification on soil nutrient transformation,the amorphous aluminum hydroxide was applied to Phyllostachys praecox soils in various planting times(0,4,18 years)to measure soil organic nitrogen mineralization using an intermittent eluent culture method.The results showed that the addition of amorphous aluminum hydroxide inhibited soil organic nitrogen mineralization,and there was a significant linear correlation between the addition rate and the inhibition rate of nitrogen mineralization.The inhibition rates of soil nitrogen mineralization were 22.42％,31.86％and 35.3％,respectively,in the three soils with the addition rate of 20 g/kg.Ammonium content showed stable in various treatments but nitrate content decreased significantly with the increasing addition rate of amorphous aluminum hydroxide.The ratio of ammonium to nitrate in mineralized nitrogen increased significantly with the increasing addition rate,suggesting that the inhibition of nitrogen mineralization was mainly resulted from the nitrification inhibition.Overall,soil nitrogen mineralization will decrease under the acidic condition that exert further a great impact on soil nutrient cycling.
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