土壤固定态铵的影响因素

FACTORS AFFECTING SOIL-FIXED AMMONIUM

本文研究了有机质、全氮、有机氮、粘粒、CEC、溶液中铵浓度、水分、温度等影响土壤固定态铵含量的因素。结果表明,固定态铵与<0.01lmm的粘粒呈显著正相关,但与<0.00lmm的粘粒、有机质、全氮、有机氮、CEC相关性很差。通过拟合Langmuir方程可知河沙泥的最大固铵量为357.2mgN/kg,这与359mgN/kg相近。无论是潮沙泥还是紫泥田,固定态铵含量均有:30oC>20oC,30oC>40oC。除了黄泥田外,紫泥田,河沙泥和潮沙泥三种土壤的固定态铵含量均有:长期淹水>干湿交替8次>长期干燥。

Some factors affecting soil-fixed ammonium, such as organic matter, total N, organic N, clay, CEC, ammonium content in soil solution, moisture and temperature, were studied. The results indicate that soil-fixed ammonium is positively related to <0.01 mm clay content, but not much related to < 0.001 mm clay, organic matter, total N, organic N or CEC. Fitting of the Langmuir equation reveals that the maximum ammonium-fixation by river mud is 357.2 mgN/kg, quite close to 359 mgN/kg, and that no matter whether tidal mud or Zhinitian, their ammonium fixation rates show a trend of 30℃ > 20℃ and 30℃ > 40℃.Besides Huangnitian, ammonium-fixation rates of Zhinitain, river mud and tidal mud all have a similar trend of long-term inundation > 8 times dry and wet alternation > long-term drought.