| 酸性环境下作物幼苗对NO-3-N和NH+4-N的吸收特征 |
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| 引用本文： | 汪晓丽,陈平,封克.酸性环境下作物幼苗对NO-3-N和NH+4-N的吸收特征[J].扬州大学学报(农业与生命科学版),2007,28(2):52-56. |
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| 作者姓名： | 汪晓丽 陈平 封克 |
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| 作者单位： | 扬州大学,江苏省作物遗传生理重点实验室,江苏,扬州,225009 |
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| 基金项目： | 国家自然科学基金
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扬州大学校科研和教改项目 |
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| 摘 要： | 以水稻、小麦、玉米3种作物的不同品种为试验材料,采用溶液培养方法研究介质pH对幼苗根系铵态氮(NH_4~ - N)和硝态氮(NO_3~--N)吸收速率的影响。结果表明:植物幼苗根系对2种无机氮素的吸收速率受介质pH的影响大,影响程度与作物的种类、品种和苗龄有关。多数作物品种在pH 4.0条件下对NO_3~--N的吸收速率高于pH 6.0,而介质pH对NH_4~ -N吸收速率的影响与此相反。水稻幼苗对NO_3~--N的吸收速率随苗龄的增大而减慢,但对NH_4~ -N的吸收速率则逐渐加快。小麦和玉米对NO_3~--N和NH_4~ -N的吸收速率均随苗龄的增大而加快。
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| 关 键 词： | 水稻 小麦 玉米 低pH NO_3~--N NH_4~ -N |
| 文章编号： | 1671-4652(2007)02-0052-05 |
| 修稿时间： | 2006年8月10日 |
Uptake characteristics of NO-3-N and NH+4-N by different plant seedlings under the low pH condition |
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| WANG Xiao-li,CHEN Ping,FENG Ke.Uptake characteristics of NO-3-N and NH+4-N by different plant seedlings under the low pH condition[J].Journal of Yangzhou University:Agricultural and Life Science Edition,2007,28(2):52-56. |
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| Authors: | WANG Xiao-li CHEN Ping FENG Ke |
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| Abstract: | Effects of low medium pH on uptake rate of ammonium nitrogen and nitrate nitrogen by seedlings of different varieties of rice,wheat and maize were studied through solution culture method.Results indicated that the effects of medi- um pH on inorganic nitrogen uptake varied with plant species,varieties,and seedling ages.Majority of plant varieties ab- sorbed nitrate faster at low pH(4.0)than at near neutral pH(6.0),while uptake of ammonium was slower at pH 4.0 than at pH 6.0.The uptake rate of nitrate by rice roots decreased with the seedling ages,while that of ammonium increased. Roots of wheat and maize seedlings had increasing uptake rates of both nitrate and ammonium with the growth ages. |
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| Keywords: | rice wheat maize low pH NO_3~--N NH_4~ -N |
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