采用5点取样法对海南岛吊罗山自然保护区内单优青皮林森林土壤进行取样,分析海拔高度、土层深度、季节及土壤理化性质对土壤的硝化-反硝化作用影响因素。结果表明:海拔高度及土层深度对硝化-反硝化作用影响不同;季节对其有显著影响(p＜0.05),雨季土壤的硝化-反硝化作用强度是旱季的几十至上百倍;土壤理化性质对土壤硝化作用没有影响(p＞0.05),但全磷、全钾、有效磷、速效钾和含水率均与反硝化作用强度呈显著负相关(p＜0.05)。以上结果说明,在研究区青皮林土壤氮素转化过程中,季节是重要影响因素,土壤部分理化性质是反硝化作用的重要影响因素。
5 point sampling method was adopted to take soil sample in the Vatica mangachapoi single-species-dominated forest of Diaoluoshan Nature Reserve,Hainan Island.The effects of altitude,soil layer depth,season and soil physical & chemical properties on the soil intensity of nitrification-denitrification were analyzed.The results showed that the altitude and soil layer depth had no significant effect on the soil nitrification-denitrification(p> 0.05).The season had a significant effect on them(p< 0.05),of which the soil intensity of the nitrification-denitrification in a rainy season was dozens to a hundred times higher than that in a dry season.The soil physical & chemical properties had no effects on soil nitrification intensity(p> 0.05),but the total phosphorus,total potassium,available phosphorus,available potassium and moisture content were significantly negative related to the soil intensity of denitrification(p< 0.05). This suggests that the season is an important influence factor,and part of soil physical & chemical properties are one of the important factors affecting soil denitrification intensity in the process of soil nitrogen transformation in the research area.
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