森林土壤硝态氮测定中样品采集与保存方法的研究  

Study on the Methods of Sample Collection and Keeping in Forest Soil NO_3-N Determination

作　　者：杨乐苏[1] 周光益[1] 邱治军[1] 王志香[1] 于彬[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广东广州510520

出　　处：《林业科学研究》2005年第2期209-213,共5页Forest Research

基　　金：国家科技部社会公益项目(编号2000DIB50161);广东省自然科学基金项目(编号032384)

摘　　要：通过对南方花岗岩发育的红壤样品的研究,得出以下初步结论:(1)由于降水对土壤硝态氮尤其对表土硝态氮的影响较强,因此测定土壤硝态氮的样品在采集时应避开降雨等特殊天气,最好在暴雨后1个星期或连续有3～5d未降雨的情况下进行;(2)误差分析表明:风干、冷藏和冷冻保存平均相对误差分别为-8 16%、-5 18%、0 185%;样品保存方法以-6～-7℃下冷冻效果最好;(3)通过3组对比分析表明:土壤硝态氮提取过程中,样品振荡时间以30min为宜。Based on the research of red soil sample that developed from granite, the results are as follows: (1) Because the content of NO_3-N in soil, especially the top soil, is infected seriously by the precipitation, soil sample should be collected on the day that avoid special weather such as rain. It is better to collect on the day without raining for 3 to 5 days or 1 week after rainstorm; (2) Three keeping ways of soil sample are taken in the test, that were wind drying, cooling and freezing. Error analysis showed that the average relative error of wind drying, cooling and freezing way were -8.16%, -5.18% and 0.185% respectively. The best keeping way is freezing(in temperature of -6～-7 ℃). (3) Through three group contrastive experiments,it was found that the best vibrating time of sample testing was 30 minutes.

关 键 词：森林土壤 硝态氮 样品采集与保存 误差分析 

分 类 号：S714.5[农业科学—林学]