| 韩希英,宋凤斌.干旱胁迫对玉米根际氮的有效性及其相关酶活性和细菌的影响[J].干旱地区农业研究,2007,(2):71~76 |
| 干旱胁迫对玉米根际氮的有效性及其相关酶活性和细菌的影响 |
| Effects of drought stress on Rhizospheric available N Enzyme activities and bacteria related to N transformation in maize |
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| DOI：10.7606/j.issn.1000-7601.2007.02.16 |
| 中文关键词: 干旱胁迫 根际 氮 酶活性 细菌 |
| 英文关键词:drought stress rhizosphere N Enzyme activity bacteria |
| 基金项目:中国科学院知识创新工程重大项目(KZCX1—SW—19) |
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| 中文摘要: |
| 通过盆栽试验,研究了干旱胁迫下两基因型玉米根际有效态N及其两种相关酶活性和细菌的变化。结果表明:除白单9苗期外,干旱胁迫增加了玉米根际NH4+-N的含量,增加幅度为白单31>白单9;NO-3-N受干旱胁迫的影响比较小。干旱胁迫增加了玉米苗期根际蛋白酶的活性,减少了拔节期和抽雄～开花期的活性;脲酶活性受干旱胁迫的影响随基因型和生育时期而发生变化。干旱胁迫减弱了玉米氨化细菌的根际效应,与对照根际氨化细菌数量相比,白单31在苗期和拔节期根际氨化细菌数量受干旱胁迫的影响达极显著水平,在抽雄～开花期达显著水平;根际硝化细菌数量在干旱胁迫下有所增加。干旱胁迫改变了玉米根际NH+4-N和NO-3-N与蛋白酶、脲酶、氨化细菌和硝化细菌的相关性。 |
| 英文摘要: |
| Rhizospheric soil available N,enzyme activities and bacteria related to N transformation under drought stress in two genotypes of maize were investigated with a pot experiment.The results showed that except Baidan9 at seedling,rhizospheric NH+4-N of maize was increased under drought stress,and the increment of Baidan31 was higher than Baidan9.The changes of rhizospheric NO-3-N were not evident under drought stress.Rhizospheric protease activity was enhanced at seedling,but decreased at jointing and tasseling-anthesis under drought stress.Changes of rhizospheric urease activity under drought stress were different along with different genotypes and phases.Drought stress weakened the rhizosphere effect of ammonifying bacteria.Under drought stress,rhizospheric ammonifying bacterium amount of Baidan31 was very significantly different at seedling and jointing,and significantly different at tasseling-anthesis from that of control.Rhizospheric nitrifying bacteria tended to increase under drought stress.Drought stress changed the correlation of NH+4-N and NO-3-N with protease,urease activity,ammonifying bacteria and nitrifying bacteria. |
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