水土保持学报2017，Vol.31Issue(4)：211-218,8.DOI:10.13870/j.cnki.stbcxb.2017.04.034
控释氮肥减量施用对南方丘陵地区春玉米土壤渗漏水氮素动态及其损失的影响
Effects of CRNF Application on Nitrogen Dynamics and Loss of Leachate Water in Spring Maize Soil in Hilly Area of South China
摘要
Abstract
In order to improve the nitrogen use efficiency and reduce the resource waste and the risk of environmental pollution,a study on the leakage loss of controlled release nitrogen fertilizer (CRNF) application in hilly area of South China was conducted.The effects of CRNF (T3 ～ T6) application on nitrogen dynamics and loss of TN,NO3--N and NH4+-N in leachate water under different treatments in spring maize soil were explored.The results showed that the leakage water was 3 888～3 948 L when the nitrogen application rate was 168～240 kg N/hm2,hence fertilizer application rate had no significant effect on the leakage volume (P＞0.05).Average leaching loss concentration of TN,NO3--N and NH4+ N under T3 treatment were as follows 32.66 mg/L,29.41 mg/L,and 0.26 mg/L.Compared with the application of common urea (T2),T3 treatment with the same amount of nitrogen application rate decreased by 24.99％ (P＜0.01),25.56 ％ (P＜0.01) and 25.71％ (P＜0.05),respectively.Meanwhile,the loss load decreased by 24.10 ％(P＜0.01),25.62 ％(P＜0.01) and 18.97 ％(P＞0.05),respectively,and namely 53.07,47.14 and 0.47 kg N/hm2.When the nitrogen fertilizer application rate was reduced by 10％,20％％,30％,the corresponding average TN loss concentration were 28.81,26.50 and 24.34 mg/L,which decreased by 11.79％(P＞0.05),18.86％(P＜0.05),25.47％(P＜0.05)compared to T3.Similarly,the loss load were 41.78,36.62,and 33.90 kg N/hm2,which decreased by 21.27％(P＜0.01),31.00％(P＜0.01),36.12 (P＜0.01),respectively.NO3-N is the major component of leakage nitrogen loss,which accounted for 88.83 ％～92.75％ of TN loss load,and DON was also not negligible.During the planting of spring maize in dry land,the CRNF application rate with 192 kg/hm2 could effectively reduce the loss of nitrogen leaching and the risk of environmental pollution,and even increase yield and efficiency.关键词
控释氮肥/施氮量/渗漏/氮素损失Key words
CRNF/nitrogen application rate/leachate water/nitrogen toss分类
农业科技引用本文复制引用
谢勇,荣湘民,何欣,石敦杰,唐丽,刘强,张玉平..控释氮肥减量施用对南方丘陵地区春玉米土壤渗漏水氮素动态及其损失的影响[J].水土保持学报,2017,31(4):211-218,8.基金项目
同家科技支撑计划项目(2014BAC09B01) （2014BAC09B01）
省教育厅平台项目(15K056) （15K056）
