摘要
以7年生‘黄金梨’树为试材,采用^(15)N示踪技术研究了3个施氮深度[0(表面施氮)、20和40 cm]处理下不同器官对氮素的吸收、分配及利用效率,并探讨了氮素在土壤中的残留及损失。结果表明,梨果实成熟期,果实的Ndff值最高,其他器官的Ndff值均表现为20 cm施氮深度处理显著高于其他处理。各施氮深度处理,^(15)N的分配率均为贮藏器官最高,生殖器官最低。20 cm施氮深度处理的梨树N利用率最高(26.23%),40 cm施氮深度处理最低(15.65%)。N损失率以表面施氮处理最高(54.21%),20 cm施氮深度最低;0~80 cm土层的N残留率以40 cm施氮深度处理最高(31.73%),表面施氮处理最低。因此,本研究中,20 cm深度施氮处理能提高梨树各器官对N肥的吸收征调能力,氮素损失少。
In this field experiment,seven-year-old pear trees(Pyrus pyrifolia‘Hwangkumbae')were treated by ^(15) N-tracer to research the effects of fertilization depth(0,20 and 40 cm)on nitrogen absorption,distribution and utilization of different pear trees organs,residual and loss in the soil. The results indicate that the ^(15) N derived from fertilizer(Ndff)was the highest in the fruit at fruit maturity stage,and the Ndff in other organs of 20 cm treatment is significant higher than that of other treatments. The ^(15) N distribution ratio of each treatment is highest in storage organs and lowest in vegetative organs. The N utilization ration of 20 cm depth treatment is highest(26.23%),and that of 40 cm depth treatment is lowest(15.65);the N loss ration of 40 cm depth treatment is the highest(54.21%),and that of 20 cm depth treatment is lowest;the N residual ration during 0–80 cm depth soil of 40 cm depth treatment is the highest(31.73%),and that of 0 cm depth treatment is lowest. Thus,the 20 cm depth treatment can enhance the absorption and ability to transfer N to organs of pear trees,and reduce the nitrogen loss and residual in the soil in this study.
出处
《园艺学报》
CAS
CSCD
北大核心
2017年第11期2171-2178,共8页
Acta Horticulturae Sinica
基金
国家科技支撑计划子课题项目(2014BAD16B03-3)
国家自然科学基金青年基金项目(51609006)
北京市科委重大项目(D161100000716002)
关键词
梨
施氮深度
Ndff
15N分配率
N利用率
pear
fertilization depth
Ndff
distribution ratio of 15N
utilization ratio of N