A Study of Variation Character of Soil Nitrogen Compositions under Drainage Condition in Typical Alpine Marsh Wetlands of the Western Sichuan Plateau
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摘要: 为探究排水条件下典型高寒沼泽湿地土壤氮素空间变异特征，2017年8月在若尔盖地区选择3种典型湿地类型，即泥炭沼泽（Peat marsh，PM）、沼泽草甸（Swamp meadow，SM）和草地草甸（Grass meadow，DM）为研究对象，对0~20 cm、20 cm~40 cm、40 cm~60 cm、60 cm~80 cm 4个层次土样进行测试分析，结果显示：各湿地类型土壤全氮（TN）、有效氮（EN）、硝态氮（NN）、有机氮（DON）具有显著的垂向空间变异规律，而且在各层次间都表现为PM > SM > GM的分布特征，而铵态氮的空间变异较大，呈无规律分布，TN、EN、NN、DON之间均具有显著的正相关关系。3种湿地类型不同土壤氮素含量空间分异特征表明，土壤有效氮（EN）、硝态氮（NN）、有机氮（DON）对指示高寒沼泽湿地退化具有重要意义。Abstract: Aiming to understand the variation character of various nitrogen compositions in typical alpine swamp soil,three sites with different ground water tables in Zoige Plateau were selected as test objects in August 2017, soil samples from different layers(0~20 cm, 20~40 cm, 40~60 cm, 60~80 cm)were determined. The result showed that there was significant vertical variation by soil profile in total nitrogen (TN), effective nitrogen (EN), nitrate nitrogen (NN), organic nitrogen (DON). In different layers, there was regular distribution (PM > SM > GM) by wetland types. Nevertheless, ammonia nitrogen (AN) showed considerable spatial variability and less distribution rules, there was significant positive relationship between any two of soil nitrogen compositions. In conclusion:EN, NN and DON will be of great importance in indicating the alpine swamp wetland degradation.
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Key words:
- Drainage;
- Alpine marsh;
- Nitrogen compositions;
- Variation character
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