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Position: Home > Articles > Fixed ammonium contents and NH4+ fixation capacities of some cultivated soils in China. Pedosphere 1995,5 (4)

Fixed ammonium contents and NH4+ fixation capacities of some cultivated soils in China.

作者：

Wen QiXiao;Cheng LiLi;Zhang XiaoHua;Wen QX;Cheng LL;Zhang XH

单位：

;Institute of Soil Science, Academia Sinica, Nanjing 210008, China.

关键词：

ammonium fixation;fixed ammonium;nitrogen ammonium fixation soil types;china

摘要：

Fixed ammonium contents and NH4+ fixation capacities of some representative cultivated soils collected from 16 provinces of China were studied. Results showed that the contents of fixed ammonium in soils ranged from 35 to 573 mg N/kg, with an average of 198 mg N/kg. The content of fixed ammonium correlated very significantly with mica content for tropical and subtropical soils, whereas this was not the case for soils in the temperate zone. At the end of a K-removal experiment the fixed ammonium content increased in most soils studied. However, it decreased in some temperate soils. Generally, fixation of NH4+ was not observed either before or after the K-removal experiment for highly weathered soils, including tropical soils and soils derived fromgranite-gneiss or Quaternary red clays in the subtropical zone, while for most soils in the Yangtze River delta the NH4+ fixation capacity was relatively high and increased significantly in the K-exhausted soils.

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Fixed ammonium contents and NH4+ fixation capacities of some cultivated soils in China.

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