摘要
用过碳酰胺溶液(与尿素溶液作对照)对中国南方3种酸性土壤和中国北方3种碱性土壤进行室内土培试验,研究氮肥施用对土壤pH和5种交换态金属(Mn、Cu、Zn、Ca、Mg)离子含量的影响。结果表明:酸性土壤pH在短期内随过碳酰胺浓度增大而急剧上升,碱性土壤pH则随过碳酰胺浓度增加呈先增加再减少然后又增加,且其变化幅度小于酸性土壤;动态试验表明,pH上升的现象是短期的,6种土壤pH达到最大值后缓慢下降,9d后3种碱性土壤的pH均降到比原来更低的程度。酸性土壤中交换性Mn、Cu、Zn的整体变化趋势表现为随过碳酰胺施用时间延长呈先降低再逐步上升,与土壤pH呈负相关;而碱性土壤中交换态Mn、Cu、Zn的含量变化不明显。6种土壤中交换态金属Ca、Mg离子含量的变化与土壤pH变化基本呈正相关。研究表明,与施用普通尿素相比,作为一种新型氮肥,施用过碳酰胺对土壤中金属元素活性不会产生新的负影响。
The effects of percarbamide on the changes of pH and soil exchangeable Mn,Cu,Zn,Ca and Mg contents in 3 acidic soils and 3 alkaline soils in China were studied by indoor incubation test.The results showed that the pH of acidic soils increased quickly,and pH in alkaline soils increased first,then fell,rose again,with the increasing concentrations of applied percarbamide,and the changing range of pH in alkaline soils was smaller than that in acidic soils.The time-course experiment revealed that the rise of soil pH was short-term,with a subsequently slow drop after reaching their maximum,and pH value of 3 alkaline soils was less than the original pH value after 9 days.The dynamic changes of exchangeable mentals（Mn,Cu,Zn） in acidic soils were negative correlated with soil pH,and the contents of Mn,Cu,Zn decreased first and then increased gradually.However,the changes of Mn,Cu,Zn in alkaline soils were not very obviously.There was a positive relationship between soil Ca,Mg and soil pH,that was,the higher pH value was,the richer exchangeable Ca,Mg contents were.New negative effects caused by applying percarbamide as a new fertilizer on availability of metals in different acidic and alkaline soils was not found.
出处
《水土保持学报》
CSCD
北大核心
2012年第6期122-126,130,共6页
Journal of Soil and Water Conservation
基金
漳州师范学院科研基金项目(SK09010)
漳州师范学院杰出青年科研人才计划项目(SJ1006)
福建省教育厅科技项目(JA07157)
关键词
过碳酰胺
酸碱性土壤
PH
交换态金属离子
percarbamide
acidic and alkaline soils
pH
exchangeable mental ion
