摘要
为了探明油菜用于植物修复时其适宜的氮肥用量,采用大田试验研究了0,90,120,150,180kg/hm^2 5个氮肥用量水平对油菜(Brassica campestris L.)湘杂油743和沣油682地上部生物量和吸收积累镉的影响。结果表明,施用氮肥显著提高了油菜地上部生物量;与对照相比,施氮处理湘杂油743和沣油682地上部生物量分别提高了473.9%~1 055.5%和412.4%~1 164.6%。施氮提高了油菜根系对镉的吸收和镉向地上部转运积累。施氮处理湘杂油743和沣油682根系镉含量分别增加1.5%~21.9%和6.0%~26.3%,地上部镉含量分别显著增加22.2%~82.8%和19.5%~45.8%,地上部镉累积量分别显著增加598.5%~1 912.4%和518.6%~1 571.3%,镉转移系数分别增加18.5%~65.1%和1.7%~19.3%。油菜根系镉含量与土壤CaCl2—Cd含量显著正相关。施氮下土壤镉有效性和镉转移系数的提高是油菜镉吸收积累增加的主要原因。本试验条件下,油菜用于植物修复时其适宜氮肥用量为150kg/hm^2。
In order to find out the suitable amount of nitrogen fertilizer for rapeseed for phytoremediation,a field experiment was conducted to study the effect of five nitrogen levels（0,90,120,150 and 180 kg/hm^2）on the yield,cadmium（Cd）uptake and accumulation of rape（Brassica campestris L.）（Xiangzayou 743 and Fengyou 682）.Results showed that the application of nitrogen fertilizer significantly increased shoot biomass of rape.Compared with the control treatment,the shoot biomass of‘Xiangzayou 743＇and ‘Fengyou 682＇was significantly increased by 473.9%-1 055.5% and 412.4%-1 164.6%,respectively.Nitrogen application increased the uptake of Cd by rape roots and the transportation of Cd from root to shoot.With nitrogen treatments,Cd concentrations in root of‘Xiangzayou 743＇and‘Fengyou 682＇were increased by 1.5%-21.9%and 6.0%-26.3%,respectively,while Cd concentrations in shoot increased significantly by 22.2%-82.8%and 19.5%-45.8%,respectively.Cd accumulation in shoot were increased significantly by 598.5%-1 912.4%and 518.6%-1 571.3%,and the Cd transfer coefficients increased by 1.7%-19.3% and 18.5%-65.1%,respectively.Cd concentration in roots was significantly negatively correlated with soil CaCl2-Cd concentration.The main reason for increasing Cd accumulation in shoot of rape was the increase of bioavailability and the transfer coefficient of Cd.Under this experimental condition,the suitable nitrogen application level for rape for phytoremediation was 150 kg/hm^2.
作者
王辉
许超
罗尊长
王帅
熊婕
朱奇宏
朱捍华
黄道友
WANG Hui;XU Chao;LUO Zunchang;WANG Shuai;XIONG Jie;ZHU Qihong;ZHU Hanhua;HUANG Daoyou(College of Resources and Environment, Hunan Agricultural University, Changsha 410128;Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125;Institute of Soils and Fertilizers of Hunan Province, Changsha 410125)
出处
《水土保持学报》
CSCD
北大核心
2017年第6期302-305,共4页
Journal of Soil and Water Conservation
基金
农办财函(2016-6号)
国家科技支撑计划项目(2015BAD05B02)
湖南省自然科学基金项目(2015JJ2081)
博士后基金(2014M562110)
关键词
氮
油菜
镉
产量
转移系数
nitrogen
rape
cadmium
yield
transfer coefficient
