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研究了不同 p H淋洗液和 Na Cl胁迫对水培条件下玉米冠层淋洗物中氮组分的影响。结果表明 :冠层淋洗物中硝态氮、铵态氮、有机态氮和全氮的含量随植物生长量的增加而提高 ;p H3.5淋洗无盐处理的 NH4 - N、NO3- N和 Tot N的含量高于 p H7.0无盐处理的含量 ,而 Org- N含量则低 ;同一淋洗处理无盐胁迫的单株氮组分淋洗量高于盐胁迫处理(p H7.0淋洗的 NO3- N未达显著水平 ) ;p H7.0淋洗液时 ,淋洗液中的氮组分以 Org- N为主 (占 5 1.6 %～ 5 7.8% ) ,p H3.5淋洗液时 ,以 NO3- N为主 (占 4 8.3%～ 5 0 .5 % ) ;与无盐胁迫相比 ,盐处理后 p H7.0淋洗的 Org- N和 p H3.5淋洗的 Org- N、NO3- N和 Tot- N的单位鲜重淋洗总量增加 ;p H3.5淋洗可增加 NO3- N和 Tot- N的单位鲜重淋洗量
The effects of different p H elution and Na Cl stress on nitrogen fractions in corn canopy eluate under hydroponic conditions were studied. The results showed that the contents of nitrate nitrogen, ammonium nitrogen, organic nitrogen and total nitrogen in the canopy leachate increased with the increase of the plant growth rate. However, NH4 - N and NO3 - N and Tot N were higher than that of p H7.0, while the content of Org-N was low. The leaching amount of nitrogen component of single plant without salt stress was higher than that of salt stress treatment (p H7 .0 rinsed NO3-N was less than the significant level). For p H7.0 eluent, the content of nitrogen was mainly Org-N (51.6% -5 7.8%), p H3 .5 eluent was mainly NO3- N (accounting for 4.83% ~ 5.0.5%). Org-N and p H3 rinsed with p H7.0 after salt treatment compared with no salt stress. 5 leaching Org- N, NO3- N and Tot-N units of fresh weight total leaching increase; p H3.5 leaching can increase NO3- N and Tot-N unit fresh weight leaching