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首页> 外文期刊>Plant and Soil >Ammonium and nitrate uptake by Eucalyptus nitens: effects of pH andtemperature
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Ammonium and nitrate uptake by Eucalyptus nitens: effects of pH andtemperature

机译：桉树对铵和硝酸盐的吸收：pH和温度的影响

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Ammonium and nitrate uptake by roots of Eucalyptus nitens was characterised with respect to pH and temperature. Uptake of ammonium and nitrate was measured as depletion from solutions by roots of intact 11 week old solution-cultured seedlings. Uptake rates of ammonium were consistently higher than those of nitrate in all experiments. Uptake rates for ammonium were 200% higher at pH 4 than at pH 6, but for nitrate were unchanged. Uptake rates of ammonium and nitrate were both reduced to a similar extent (70%) with a decrease in temperature from 20 degrees C to 10 degrees C. For ammonium uptake, there was rapid (< 24 hr) adaptation to a reduction in root temperature. The apparent preference shown here for ammonium over nitrate could be indicative of E. nitens growing in cold, acidic forest soils where ammonium is commonly more available than nitrate. These results suggest that N uptake rates of E. nitens may be maximised under a wide variety of conditions if N is supplied predominantly in the ammonium form.
机译：根据pH和温度表征了桉树根部对铵和硝酸盐的吸收。完整的11周龄溶液培养幼苗的根部从溶液中消耗的铵盐和硝酸盐被测量为消耗量。在所有实验中，铵的吸收率始终高于硝酸盐。在pH 4时，铵的吸收率比在pH 6时高200％，但硝酸盐的吸收率没有变化。随着温度从20摄氏度降低到10摄氏度，铵和硝酸盐的吸收速率都降低了相似的程度（70％）。对于铵的吸收，快速（<24小时）适应了根温的降低。此处显示的铵比硝酸盐明显的偏爱可能表明在低温，酸性森林土壤中氨氮菌的生长，那里的铵通常比硝酸盐更易吸收。这些结果表明，如果氮主要以铵的形式提供，那么在多种条件下，大肠埃希氏菌的氮吸收率可能会最大化。

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