摘要
以尿素为氮源,采用土壤好气培养试验,研究了砖红壤区橡胶林短期内不同培肥方式下土壤硝化作用特征。结果表明,尿素加入胶园土壤后即迅速水解,加入橡胶树行间未经培肥区土壤(a)中4天水解99.0%,生成的铵态氮14天后开始较强的硝化作用,最大硝化率为46.2%,培养63天后NH4+-N含量仍保持在63.2 mg kg-1的较高水平;而尿素加入经有机无机肥培肥土壤(c)中1天水解99.8%,加入单用化肥培肥的土壤(b)中4天水解98.6%以上,水解生成的铵态氮培养至第4天即开始较强的硝化作用,14天基本硝化完全,最大硝化率都在99%以上,使得培肥区土壤中的无机氮主要以硝态氮形式存在。
Using urea as nitrogen fertilizer, an incubation method was conducted to study the effect of different fertilization treatments on the nitrification of a latosol under rubber plantation in a tropical area. The results showed that 99.0 % of the urea was hydrolyzed in four days after applied to the soil （a） , the but urea derived NH4^＋ - N was nitrified slowly , and the maximal nitrification ratio was only 46.2 %. Hence, the content of NH4^＋ - N in the soil was still kept at 63.2 mg kg^-1 after cultivated for 63 days . However, 99.8 % of the urea was hydrolyzed in one day after applied to the soil （c）-the mixed green manure and chemical fertilizer, and 98.6 % in the soil （b）-the single chemical fertilizer. The transfomed NH4^＋ -N in the soil （b） and （c） was nitrified entirely in 14 days, and the largest nitrification ratio was 99.0 %, and then NO3^- - N became the main nitrogen form in the soils.
出处
《土壤通报》
CAS
CSCD
北大核心
2006年第5期928-931,共4页
Chinese Journal of Soil Science
基金
农业部重大产业结构调整项目(20031001A)
中国热带农业科学院院基金资助项目
关键词
砖红壤
橡胶林地
培肥
尿素
硝化作用
Latosol
Rubber plantation
Fertilization
Urea
Nitrification
