采用低温加热法测定土壤固定态铵的探讨

中国农业科学 ›› 2005, Vol. 38 ›› Issue (03): 624-628 .

采用低温加热法测定土壤固定态铵的探讨

张崇玉,李生秀

西北农林科技大学资源环境学院

收稿日期:2004-02-02 修回日期:1900-01-01 出版日期:2005-03-10 发布日期:2005-03-10
通讯作者: 张崇玉

Determination of Fixed Ammonium in Soils Using Low-Temperature Heating Method

西北农林科技大学资源环境学院

Received:2004-02-02 Revised:1900-01-01 Online:2005-03-10 Published:2005-03-10

摘要/Abstract

摘要： 以Silva-Bremner 法为对照，在不同加酸量、温度和时间条件下，测定了土娄土中的固定态铵含量，确定了低温加热法释放土壤固定态铵的最佳条件。该条件是在敞口的情况下，加入5 mol·L-1 HF-1mol·L-1 HCl溶液，在100℃条件下加热1.5～2 h。以确定的方法测定了全国38种不同类型土壤中的固定态铵。结果表明，低温加热法适合于土壤固定态铵的测定。与Silva-Bremner 法相比，低温加热法测定的38种土壤固定态铵误差在5%左右；两种方法测定结果无显著差异，测定结果显著相关（r = 0.99）。

关键词: 固定态铵, Silva-Bremner法, 低温加热方法

Abstract: For reducing the long period of shaking for the release of the fixed ammonium by Silva-Bremner method, a new procedure was proposed. The new procedure is that the soil is heated at low-temperature after removal of the exchangeable ammonium and organic N. A manurial loessial soil was sampled to study the effect of acid volume, temperature and heating time on the release of the fixed ammonium by Silva-Bremner method for making comparison. Through this study, optimal conditions were determined for using such a method: treating soil with 5 ml of 5 mol·L-1 HF-1 mol·L-1 HCl and heating at 100 ℃ for 1.5~2 h. Thirty eight soil samples were collected all over China to compare the results between the two methods. Results show that the two techniques gave virtually the same results for the 38 soils with a coefficient of 0.99, and the relative errors was within 5% for the low-temperature heating method. No significant difference was found in the results between the two methods as shown by T-test for individual pairs of each soil.

Key words: Fixed ammonium, Silva-Bremner method, Low-temperature heating method

张崇玉,李生秀. 采用低温加热法测定土壤固定态铵的探讨[J]. 中国农业科学, 2005, 38(03): 624-628 .

,. Determination of Fixed Ammonium in Soils Using Low-Temperature Heating Method[J]. Scientia Agricultura Sinica, 2005, 38(03): 624-628 .