摘要
石灰性土壤含有大量CaCO3所产生的高含量HCO3-及CaCO3对Zn的吸附作用被认为是造成作物缺锌的重要原因。该研究在营养液中添加CaCO3或HCO3-,探讨了两者在不同供Zn条件下对2种小麦(小偃22、郑麦9023)与1种大麦(西引2号)幼苗生长及Zn吸收的影响。结果表明,不供Zn条件下,添加HCO3-时3种供试作物均出现明显失绿症状,供Zn时症状减轻;同时HCO3-明显抑制小麦和大麦生长,供Zn抑制作用减轻。供Zn显著增加幼苗的Zn吸收,且地上部增加幅度高于根系;3种供试作物均对缺锌较为敏感;HCO3-通过抑制幼苗生长及Zn从根系向地上部转运而影响Zn吸收,大麦的锌转运率高于小麦。HCO3-还显著提高了营养液pH,但介质中有作物时pH值增加幅度较小;与HCO3-相比,高量CaCO3对作物生长及Zn吸收影响较小,但能明显提高营养液pH值。
The adsorption of high concentration of bicarbonate （HCO3ˉ ）originated from calcareous soils which are rich in CaCO3 and CaCO3 itself are considered the main factors to cause zinc deficiency in crops. A solution culture experiment was conducted to investigate that, under deficient and sufficient Zn supply, the effects of CaCO3 and HCO3ˉ （addition as NaHC03）addition on the growth and Zn absorption of two wheat cultivars （Xiaoyan22 and Zhengmai9023）and a barley cultivar （Xiyin2）. The results showed that under deficient Zn supply condition, addition of bicarbonate caused the obvious chlorosis symptoms of the three crops tested, and with Zn supply, the symptoms were slighter; meanwhile, bicar- bonate obviously inhibited growth of barley and wheat plants, and Zn sufficient supply could alleviate the inhibition. Zn supply significantly increased Zn uptake of plants, and also the increase range in the shoots was higher than that in the roots; the three test crops were all sensitive to Zn deficiency; Zn uptake affected by bicarbonate was mainly through inhibiting seedling growth and Zn translocation from roots to shoots, and with HCO3ˉ addition barley had higher zinc translocation rate than wheat, and more Zn was accumulated in roots comparing to no HCO3ˉ addition in the nutrient solution. With HCO3ˉ addition, the Zn translocation rates of Xiaoyan22 and Zhengmai9023 decreased by 24.0% and 23.4 %, respectively;while barely increased by 31.1%. The bicarbonate also greatly increased the pH of solution, but the extent of pH increase was relatively small when growing plants in the nutrient solution. Compared with HCO3ˉ , high content of CaCO3 had little influence on plant growth and zinc uptake, but showed obvious influence on the pH increase of nutrient solution.
出处
《华北农学报》
CSCD
北大核心
2009年第4期134-141,共8页
Acta Agriculturae Boreali-Sinica
基金
教育部新世纪优秀人才支持计划(NCET-06-0866)
西北农林科技大学青年学术骨干支持计划(2007)
作者简介
陆欣春（1982-），男，内蒙古赤峰人，博士，主要从事旱地养分调控方面的研究。
通讯作者：田霄鸿（1967-），男，甘肃天水人，博士，教授，主要从事植物营养与调控方面的研究。
