干旱条件下氮、磷水平对土壤锌、铜、锰、铁有效性的影响

Effect of different N and P levels on availability of zinc, copper, manganese and iron under arid conditions

摘要: 研究了干旱条件下不同N、P水平对微量元素Zn、Cu、Mn、Fe有效性的影响。结果表明 ,在中壤质土壤含水量 11%～ 14%的情况下 ,不同N、P配比明显增加了土壤剖面中速效P的含量 ,但随着土壤深度的增加 ,土壤速效P呈不断下降的趋势。大田和土壤培养试验表明 ,施P有增加土壤Zn、Cu、Mn有效性的趋势 ,但有效Fe则有下降的趋势。土壤速效P、Zn、Cu、Mn、Fe之间的相关分析表明 ,土壤速效P与有效Zn之间存在显著的正相关关系 (r =0.65) ,而与有效Fe之间则存在显著的负相关关系 (r =- 0.63)。

Abstract: Effect of different levels of N and P on availability of Zn, Cu, Mn and Fe under arid conditions was studied. Results showed that the content of available P increased in loamy soil by application of N and P under the content of soil water (11%～14%), and content of soil available P decreased with the depth of soil increase. Application of P could increase the available Zn, Cu and Mn contents, on the contrary, for iron. The coefficient of correlation was 0.65, and -0.63 between available P and Zn , and available P and Fe, respectively.