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宋海星, 李生秀. 水、氮供应和土壤空间所引起的根系生理特性变化[J]. 植物营养与肥料学报, 2004, 10(1): 6-11. DOI: 10.11674/zwyf.2004.0102
引用本文: 宋海星, 李生秀. 水、氮供应和土壤空间所引起的根系生理特性变化[J]. 植物营养与肥料学报, 2004, 10(1): 6-11. DOI: 10.11674/zwyf.2004.0102
SONG Hai-xing, LI Sheng-xiu. Changes of root physiological characteristics resulting from supply of water, nitrogen and root-growing space in soil[J]. Journal of Plant Nutrition and Fertilizers, 2004, 10(1): 6-11. DOI: 10.11674/zwyf.2004.0102
Citation: SONG Hai-xing, LI Sheng-xiu. Changes of root physiological characteristics resulting from supply of water, nitrogen and root-growing space in soil[J]. Journal of Plant Nutrition and Fertilizers, 2004, 10(1): 6-11. DOI: 10.11674/zwyf.2004.0102

水、氮供应和土壤空间所引起的根系生理特性变化

Changes of root physiological characteristics resulting from supply of water, nitrogen and root-growing space in soil

  • 摘要: 在限制根系生长的胁迫条件下.,研究了补充和不补充供应水、氮对玉米根系生理特性及养分吸收的影响。结果表明.,正常生长条件下.,水、氮供应促进了根系生长.,增加了根系吸收总面积、活跃吸收面积和TTC还原量.,促进了根系对养分的吸收.,从而提高了产量.;限制根系生长.,水分的作用与正常条件下相同.,氮素的作用则受控于土壤水分。补充灌水增强了氮肥作用.,供氮促进了根系生长.,改善了根系生理特性.,减少了限制根系生长所引起的不良影响.;不补充灌水限制了氮肥作用的发挥.,供氮导致了根系生物量和生理特性下降.,加重了限制根系生长的不良影响。

     

    Abstract: Effects of supplemental supply of water and N upon maize root physiological characteristics and nutrient uptake were studied under a condition of limited root-grown space. Results showed that under anormal root-grown condition, supply of water and N stimulated root growth, increased total root absorbing area, enhanced actively absorbing area and TTC-reducing amounts, promoted nutrient uptake, and finally led to crop yield increase. Water function to roots grown in a limited space was similar to those grown under a normal condition while N function was controlled by water supply. Supplemental irrigation enhanced N effects, and therefore under an irrigation condition, N supply promoted root growth, improved root physiological characteristics, and decreased the detrimental effects resulting from limitation of the root-grown space. Without supplemental irrigation, N function was greatly affected, and its supply brought about decrease of root biomass and physiological characteristics. In this case, the detrimental effects resulting from limitation of the root-grown space were increased.

     

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