水土保持学报2017，Vol.31Issue(4)：254-258,5.DOI:10.13870/j.cnki.stbcxb.2017.04.040
富士苹果营养转换期肥料氮去向和土壤氮库盈亏研究
Study on Fertilizer Nitrogen Fate and Soil Nitrogen Pool Budget During Nutrition Transformation Period of Fuji Apple
摘要
Abstract
The fertilizer nitrogen absorption and utilization,soil nitrogen residue and soil nitrogen pool budget under different nitrogen levels (0,50,100,150,200,and 250 kg/hm2) were studied using 15N isotope tracer technique during nutrition transformation period of 5-year-old Fuji Apple.The results showed that with the increasing of nitrogen application,utilization ratio of fertilizer nitrogen decreased gradually,and the percentage of tree nitrogen absorbed from soil nitrogen gradually decreased,but from nitrogen fertilizer increased.After one month of nitrogen application,5.75 ％ ～12.99 ％ of fertilizer nitrogen was absorbed by tree,and 29.62 ％ ～ 39.74％ of it remained in 0-60 cm soil,and 47.27％～64.64％ of it lost by other means.With the increasing of nitrogen application rate,the amount of fertilizer nitrogen absorbed by tree and soil residual nitrogen increased gradually,but the utilization rate of fertilizer nitrogen and soil residual rate decreased,and meantime,the loss amount and the loss rate of fertilizer nitrogen were both increasing gradually.Residual fertilizer nitrogen in the soil mainly distributed in the topsoil (0-20 cm),and soil 15N abundance increased significantly with the increasing of nitrogen application.With the increasing of nitrogen application,soil total nitrogen balance changed from deficit to surplus,and this indicated that low nitrogen application rate could lead to the decrease of soil nitrogen fertility,and the excessive application of nitrogen could increase the accumulation of nitrogen.There was a significant positive correlation between soil total nitrogen balance and nitrogen application rate,and the regression equation was y=0.3147x-16.144(R2 =0.990 2),soil nitrogen pool reached balance when nitrogen application rate was 51.30 kg/hm2.关键词
苹果/营养转换期/氮水平/氮去向/土壤氮库盈亏Key words
apple/nutrition transformation period/nitrogen level/nitrogen fate/soil nitrogen pool budget分类
农业科技引用本文复制引用
王芬,田歌,彭玲,何流,刘晓霞,葛顺峰,姜远茂..富士苹果营养转换期肥料氮去向和土壤氮库盈亏研究[J].水土保持学报,2017,31(4):254-258,5.基金项目
国家自然科学基金项目(31501713) （31501713）
国家重点研发计划资金项目(2016YFD0201100) （2016YFD0201100）
国家现代农业产业技术体系建设资金项目(CARS-28) （CARS-28）
