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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (22): 66-69.

• 林学 园艺 园林 • 上一篇    下一篇

柽柳根不同区域吸氮特性研究

骆翔 朱艳霞 杜友 郭玉海   

  • 收稿日期:2011-02-21 修回日期:2011-03-08 出版日期:2011-09-05 发布日期:2011-09-05
  • 基金资助:

    农业行业专项;北京市科技计划;河北省科技攻关项目;教育部研究生创新项目

The Study on the Nitrogen-absorbing Characters in Different Root Parts of Tamarix chinensis Lour.

  • Received:2011-02-21 Revised:2011-03-08 Online:2011-09-05 Published:2011-09-05

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摘要：

为了探讨柽柳根不同区域的氮素吸收特性，采用非损伤离子探测技术，测定了柽柳根尖、分生区、伸长区和根毛区的铵离子和硝酸离子的流量；硝态氮肥和铵态氮肥对柽柳生根和管花肉苁蓉接种的影响。结果：（1）柽柳根的根尖、分生区及伸长区表现为硝酸离子内流，分别为9.7、12.9、11.7 pmol/(cm2?s)，根毛区则表现为硝酸离子外流，达到11.0 pmol/(cm2?s)；而柽柳根的根尖、分生区、伸长区和根毛区均表现为铵离子外流，分别为47.3、36.7、37.8、21.7 pmol/(cm2?s)。结果显示，柽柳根具有吸收硝态氮而排出铵态氮的吸氮特性。（2）施用硝态氮肥提高单株柽柳生根条数和管花肉苁蓉接种个数。

关键词: 玉米, 玉米, 省域尺度, 比较优势, 河北省

Abstract:

To explore the nitrogen absorbing character in different root parts of Tamarix chinensis Lour., the flux of NH4+ and NO3- in the root tip, meristematic zone, elongation zone and mature region of Tamarix chinensis roots were measured by Non-invasive Micro-test Technique. The influence on the root growing of Tamarix chinensis and infection rate of Cistanche tubulosa was studied. The results showed that: (1) The NO3- was influx in the root tip, meristematic zone and elongation zone of Tamarix chinensis roots, the values were 9.7, 12.9, 11.7 pmol/(cm2?s) respectively. However in the mature region it showed efflux, the value was 11.0 pmol/(cm2?s); the NH4+ showed efflux in all rigions were measured, the mean values were 7.3, 36.7, 37.8, 21.7 pmol/(cm2?s) respectively. These results suggested the Tamarix chinensis preferred to take up NO3-. (2) The nitrate could increase the number of Tamarix chinensis roots and the Cistanche tubulosa.