摘要
采用田间取样与室内分析相结合的方法,研究了黄土高原坡地苹果园肥力状况与矿质氮累积。结果表明,坡地苹果园土壤肥力低,氮、磷严重缺乏,钾相对丰富,土壤属于砂壤土,通气性强,保肥、保水性差。0—60cm土层土壤有机质含量为9.24～28.12g/kg,全氮为0.22～0.60g/kg,速效磷为0.17～16.08mg/kg,速效钾为80.06～168.39mg/kg;黄土高原坡地苹果园中NO3-—N有深层累积分布,累积深度大于2m,在180—200cm层最高累积量达249.61kg/hm2,而NH4+—N无深层累积。不同施肥处理对土壤剖面中的NH4+—N和NO3-—N含量分布影响不同,对NH4+—N含量和分布影响不明显,但不同施肥方式对NO3-—N含量分布影响显著。施加氮肥促进NO3-—N深层累积,施加磷肥有助于降低土层中的NO3-—N含量,缩小富集量的分布范围。
Soil fertility and mineral N accumulation of Results show that soil appears low-fertility due to the soil aeration and poor water and nutrient retention. F eau is low on the whole. The content of soil nutrients slope apple orchard on the Loess Plateau are studied. serious lack of N and P. Soil is sandy loam, with better ertility status of slope apple orchard on the Loess Plat- of the 0--60 cm soil layer is as follows： organic matter is 9.24~28.12 g/kg; total N is 0.22~0. 60 g/kg; available P is 0.17~16.08 mg/kg; and available K is 80.06~168.39 mg/kg. There are NO3---N enrichment layers below 2 m of slope apple orchard on the Loess Plateau. Different fertilizations have significant effects on the NO3--N distribution and its content in the soil profiles, while the NH4＋--N distribution and its content were relatively constant. For more N treatment, the NO3--N enrichment depth increases, while for more P treatment, the NO3--N enrichment depth decreases in the soil profiles.
出处
《水土保持通报》
CSCD
北大核心
2009年第4期31-36,共6页
Bulletin of Soil and Water Conservation
基金
国家技术支撑项目"丘陵沟壑区生态经济建设模式研究与示范"(2006BAD09B07)
关键词
坡地
苹果园
黄土高原
矿质氮
slope
apple orchard
Loess Plateau
mineral N
作者简介
作者简介：闫亚丹（1981～），男（汉族），河南省宜阳县人，硕士研究生，研究方向为植物氮素循环。E-mail：yanyadan06@mails．gucas．ac．cn。
通信作者：徐福利（1958-），男（汉族），陕西省富平县人，博士，研究员，主要从事植物营养方面的研究工作。E-mail：xfl@nwsuaf．edu．cn。
