[目的]研究黔东南州稻田土壤硝态氮和铵态氮的含量.[方法]对从黔东南州采集的146份稻田土壤的硝态氮和铵态氮含量进行测定,研究各县市硝态氮和铵态氮含量、分布及速效氮的分级情况,对黔东南州稻田土壤肥力进行评价.[结果]黔东南州各县市间稻田土壤硝态氮和铵态氮含量差异较大,硝态氮平均含量最高的为镇远县,最低的为岑巩县;铵态氮平均含量最高的为三穗县,最低的为麻江县.速效氮主要分为3、4、5、6等级,黔东南州绝大部分稻田土壤速效氮处于5、6等级.[结论]黔东南州90％以上稻田土壤速效氮含量偏低.%[Objective] To study soil nitrate nitrogen and ammonium nitrogen content in rice fields of Qiandongnan Prefecture.[Method] Nitrate nitrogen,ammonium nitrogen content of 146 soil samples collected from Qiandongnan Prefecture were measured,and the content of nitrate nitrogen,ammonium nitrogen,and the classification and distribution of available nitrogen were analyzed and compared among counties.[Result] The soil nitrate nitrogen,ammonium nitrogen content had obvious difference between the counties,the average concentration of nitrate nitrogen from Zhenyuan County was the highest,while that from Cengong County was the lowest;the average concentration of ammonium nitrogen from Sansui County was the highest,while that from Majiang County was the lowest.Available nitrogen distributed from 3 to 6 grades,mostly in the 5 and 6 grades in Qiandongnan Prefecture.[Conclusion] More than 90％ rice field soil is deficient in soil available nitrogen.
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