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Position: Home > Articles > Mineral N Distribution in Soil Profiles of Slope Land in Gully Region of Loess Plateau Journal of Soil and Water Conservation 2003,17 (2) 31-33+66

黄土高原沟壑区沟坡地土壤剖面中矿质氮的分布特征

作  者：
郭胜利;党廷辉;郝明德
单  位：
中国科学院水利部水土保持研究所
关键词：
坡地果园;硝态氮;铵态氮;土壤水分
摘  要：
以黄土高原沟壑区典型小流域为基础,选择不同利用年限的坡地果园分析了矿质氮在土壤剖面中的分布特征及其影响因素。研究发现,化肥投入显著提高了硝态氮在100～200cm土层分布与积累。随着果园利用年限的延长,土体剖面硝态氮的积累量呈显著增加的趋势,但施肥不影响铵态氮在土层的分布特征。坡地果园中化肥的挖沟深施,长期的氮肥投入和果园土壤水分的逐渐耗竭降低是产生硝态氮深层积累的重要因素。
译  名：
Mineral N Distribution in Soil Profiles of Slope Land in Gully Region of Loess Plateau
作  者：
GUO Shengli1,2, DANG Tinghui1,2, HAO Mingde1,2  (1.Institute of Soil and Water Conservation, Chinese Academy of Sciences and the Ministry of Water Resources, Yangling, Shaanxi 712100; 2.Northwest ScsciTech University of Agriculture & Forestry, Yangling, Shaanxi 712100) 
关键词：
slope land apple yard;NO_3~--N;NH_4~+-N;soil water
摘  要：
Large accumulation of mineral nitrogen (N) in agricultural eco-systems is concerned to have potential risks to environment and to decrease nitrogen use efficiency (NUE). This study was aimed toward better understanding on the distribution of mineral N in slope land in gully regions, based on series of apple yards with different years in a small watershed in the Loess Plateau. Large amount of NO3--N was accumulated in the depth of 100～200 cm in apple yard due to application of nitrogen fertilizer. NO3--N accumulation in soil profiles increased with years.For all the treatments investigated, NH4+-N content in soil profiles was fairly small and constant (5 mgN/kg soil). Over doses of N fertilizer input, soil water depletion and deep application of fertilizer were the main drive to NO3-N accumulation in soil profiles of apple yard. 

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