水、氮供应对玉米伤流及其养分含量的影响  

Effects of water and N supply on maize bleeding sap and its nutrient contents

作　　者：宋海星[1] 李生秀[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《植物营养与肥料学报》2004年第6期574-578,共5页Journal of Plant Nutrition and Fertilizers

基　　金：国家重点基础研究专项经费(G1999011707);国家自然科学基金重点项目(30230230);国家自然科学基金面上项目(30070429;40201028)资助。

摘　　要：以玉米为供试作物,在遮雨棚内进行了微区田间试验,研究了不同水、氮供应玉米的伤流量,伤流液中的硝态氮、铵态氮、游离氨基酸及磷、钾含量,以及对植株氮、磷、钾等养分含量和吸收量的影响。结果表明,供水明显增加伤流量和伤流液中硝态氮、铵态氮、游离氨基酸及磷、钾含量。水分充足或水分胁迫较轻时,伤流量及其养分含量随施氮增加而增加;水分胁迫严重时,则减少。在不同水、氮供应条件下,植株氮、磷、钾养分含量及吸收量具有相同的变化趋势。A micro-plot field experiment was conducted under a rain-shelter condition to study the effects of water and (nitrogen) supply on bleeding sap and contents of ammonium N, nitrate N, free amino acid, P and K in the sap, and the (nutrients) absorbed by plant of maize. Four factors, soil surface treatment, irrigation, N rate and root growing space, were involved in this experiment. Determinations were carried out at an interval of certain time. Results show that under water-stress condition, water supply remarkably increased the bleed and content of nutrients in the sap of maize. The effects of N supply being depended on water supply by either irrigation or soil moisture retention. With better water supply, bleeding sap and nutrients contents were increased by N addition whereas under serious water stress condition, application of N reduced the bleeding sap and nutrients content in it. N, P and K absorbed by maize had almost the same trend as the bleeding sap.

关 键 词：玉米 水氮供应 伤流 养分吸收 

分 类 号：S513.06[农业科学—作物学]