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水培燕麥根系形態(tài)和氮吸收流量對(duì)硝態(tài)氮供應(yīng)濃度的響應(yīng)

2016-08-24 09:09:41王俊英王華青梁曉東劉景輝

植物營(yíng)養(yǎng)與肥料學(xué)報(bào) 2016年4期

王俊英，王華青，梁曉東，劉景輝

(1 中國(guó)農(nóng)業(yè)科學(xué)院生物技術(shù)研究所，北京 100081; 2 新疆農(nóng)業(yè)科學(xué)院糧食作物研究所，烏魯木齊 830091;3 內(nèi)蒙古農(nóng)業(yè)大學(xué)，呼和浩特 010019)

王俊英1*，王華青1，梁曉東2，劉景輝3*

水培; 燕麥; 根系形態(tài); 氮流量; 硝態(tài)氮

1　材料與方法

1.1試驗(yàn)材料

供試材料為來(lái)自張家口地區(qū)的3個(gè)裸燕麥栽培品種，即壩莜9號(hào)、壩莜3號(hào)和200215，由張家口市農(nóng)科院田長(zhǎng)葉研究員選育。

1.2材料培養(yǎng)與不同濃度硝酸鹽處理

區(qū)域內(nèi)地表沒有巖漿巖出露。根據(jù)航空物探磁測(cè)資料顯示，位于箭豬坡礦床NNE方向3～13km的深部，有隱伏的花崗巖體存在，這個(gè)隱伏巖體是五圩地區(qū)巖漿期后熱液多金屬礦床成礦物質(zhì)來(lái)源的提供者[6]。

溫室培養(yǎng)為14 h光照(25℃)， 10 h黑暗(20℃)，濕度80%，冠層光強(qiáng)400 μmol/(m2·s)。

1.3測(cè)定項(xiàng)目和方法

數(shù)據(jù)分析使用非損傷微測(cè)系統(tǒng)專用數(shù)據(jù)處理軟件Mageflux進(jìn)行，離子的流速根據(jù)Fick第一擴(kuò)散定律公式J=-D·(dc/dx) 制作的流速換算表(版本: JCal V3.2.2)計(jì)算，流速值J正值為外流，負(fù)值為內(nèi)流。

1.4數(shù)據(jù)處理

應(yīng)用SPSS v16.0 統(tǒng)計(jì)分析軟件對(duì)所有試驗(yàn)數(shù)據(jù)進(jìn)行單因素ANOVA方差分析，差異顯著性水平為P<0.05。

2　結(jié)果與分析

2.1不同硝態(tài)氮濃度對(duì)燕麥根系形態(tài)的影響

表1　不同硝態(tài)氮濃度供應(yīng)下3種燕麥的根系形態(tài)

2.2不同硝態(tài)氮濃度處理下燕麥品種不同直徑范圍內(nèi)根系長(zhǎng)度的分布

表2　不同硝態(tài)氮濃度下不同直徑范圍內(nèi)根系長(zhǎng)度 (mm)

注(Note): 同列數(shù)據(jù)后不同字母表示處理間差異達(dá)5%顯著水平 Values followed by different letters in a column are significant among treatments at the 5% level. 括號(hào)內(nèi)數(shù)據(jù)為不同直徑范圍內(nèi)根系長(zhǎng)度占總根長(zhǎng)的百分比Values in the parentheses show the percentage of the length of root with various diameters in total root length (%).

圖1　不同硝態(tài)氮濃度供應(yīng)下不同燕麥品種根部的流量變化Fig.1　The flux changes of various oats root under different -N concentration supply

2.4不同燕麥品種的根系氮吸收量

圖2　不同燕麥品種在不同硝態(tài)氮濃度供應(yīng)下根部流量Fig.2　The flux of various oats root underdifferent -N concentration supply[注(Note): 柱上不同字母表示處理間差異達(dá)5% Different letters above the bars mean significant among treatments at the 5% levels.]

3　討論

3.1不同硝態(tài)氮濃度對(duì)燕麥苗期根系生長(zhǎng)的影響

4　結(jié)論

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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)