黄土高原沟壑区原状土壤氮素迁移Nitrogen Migration in Intact Soil of Hilly-gully Region of Loess Plateau
杨毓峰,李世清
摘要(Abstract)：
以中国生态系统研究网络CERN长武王东沟实验站的坡耕地和塬耕地为供试土壤,研究了黄土高原沟壑塬区旱耕地原状土壤氮素迁移和时空变异。结果表明:耕作土壤NO3--N为23.1~33.8 mg/kg,NH4+-N为0.23~0.50mg/kg,DOC为9.17~13.38 mg/kg,P为0.18~0.23 mg/kg;坡耕地和塬耕地的NO3--N和NH4+-N主要集中在0~20 cm的上层土壤,中下层土壤NO3--N和NH4+-N起源于上层淋溶迁移和累积;高含量时养分淋溶溶出呈指数衰减型;NO3--N、NH4+-N、DOC向下层的迁移塬耕地慢于坡耕地。
关键词(KeyWords)： 氮素迁移;坡耕地;塬耕地;原状土壤;王东沟小流域;黄土高原沟壑区
基金项目(Foundation): 国家自然科学基金(39970151);国家自然科学基金(39970459);国家自然科学基金重点项目(30230230);; 国家开放实验室基金(10501-85);; 开放实验室基金(10501-104);; 国家基础研究重大项目前期研究专项(国科基[2001]50号)
作者(Author): 杨毓峰,李世清
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