水培燕麦根系形态和氮吸收流量对硝态氮供应浓度的响应

2016-08-24王俊英王华青梁晓东刘景辉

植物营养与肥料学报 2016年4期

关键词：水培硝态燕麦

王俊英，王华青，梁晓东，刘景辉

(1 中国农业科学院生物技术研究所，北京 100081; 2 新疆农业科学院粮食作物研究所，乌鲁木齐 830091;3 内蒙古农业大学，呼和浩特 010019)

水培燕麦根系形态和氮吸收流量对硝态氮供应浓度的响应

王俊英1*，王华青1，梁晓东2，刘景辉3*

(1 中国农业科学院生物技术研究所，北京 100081; 2 新疆农业科学院粮食作物研究所，乌鲁木齐 830091;3 内蒙古农业大学，呼和浩特 010019)

水培; 燕麦; 根系形态; 氮流量; 硝态氮

1　材料与方法

1.1试验材料

供试材料为来自张家口地区的3个裸燕麦栽培品种，即坝莜9号、坝莜3号和200215，由张家口市农科院田长叶研究员选育。

1.2材料培养与不同浓度硝酸盐处理

区域内地表没有岩浆岩出露。根据航空物探磁测资料显示，位于箭猪坡矿床NNE方向3～13km的深部，有隐伏的花岗岩体存在，这个隐伏岩体是五圩地区岩浆期后热液多金属矿床成矿物质来源的提供者[6]。

温室培养为14 h光照(25℃)， 10 h黑暗(20℃)，湿度80%，冠层光强400 μmol/(m2·s)。

1.3测定项目和方法

数据分析使用非损伤微测系统专用数据处理软件Mageflux进行，离子的流速根据Fick第一扩散定律公式J=-D·(dc/dx) 制作的流速换算表(版本: JCal V3.2.2)计算，流速值J正值为外流，负值为内流。

1.4数据处理

应用SPSS v16.0 统计分析软件对所有试验数据进行单因素ANOVA方差分析，差异显著性水平为P<0.05。

2　结果与分析

2.1不同硝态氮浓度对燕麦根系形态的影响

表1　不同硝态氮浓度供应下3种燕麦的根系形态

2.2不同硝态氮浓度处理下燕麦品种不同直径范围内根系长度的分布

表2　不同硝态氮浓度下不同直径范围内根系长度 (mm)

注(Note): 同列数据后不同字母表示处理间差异达5%显著水平 Values followed by different letters in a column are significant among treatments at the 5% level. 括号内数据为不同直径范围内根系长度占总根长的百分比Values in the parentheses show the percentage of the length of root with various diameters in total root length (%).

图1　不同硝态氮浓度供应下不同燕麦品种根部的流量变化Fig.1　The flux changes of various oats root under different -N concentration supply

2.4不同燕麦品种的根系氮吸收量

图2　不同燕麦品种在不同硝态氮浓度供应下根部流量Fig.2　The flux of various oats root underdifferent -N concentration supply[注(Note): 柱上不同字母表示处理间差异达5% Different letters above the bars mean significant among treatments at the 5% levels.]

3　讨论

3.1不同硝态氮浓度对燕麦苗期根系生长的影响

4　结论

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Response of root morphology and N absorption to nitrate nitrogen supply in hydroponic oats

WANG Jun-ying1*, WANG Hua-qing1, LIANG Xiao-dong2, LIU Jing-hui3*

(1BiotechnologyResearchInstituteofChineseAcademyofAgriculturalSciences,Beijing100081,China; 2CropResearchInstituteofXinjiangAcademyofAgriculturalSciences,Wulumuqi830091,China; 3InnerMongoliaAgriculturalUniversity,Hohhot010019,China)