化感物质对土壤硝化作用的影响  

Effects of allelochemicals on soil nitrification.

作　　者：刘秀芬[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《中国生态农业学报》2002年第2期60-62,共3页Chinese Journal of Eco-Agriculture

基　　金："九五"中国科学院重点资助项目(KZ952-SI-230)部分研究内容

摘　　要：试验研究了3种化感物质——苯甲酸、对羟基苯甲酸和阿魏酸在3种浓度(0.5mmoL、2.5mmoL和5.0mmoL)、不同pH、不同土壤含水量等环境因子作用下对土壤硝化作用的影响,在第1d、4d、7d、10d、14d取样与对照比较,测定其对土壤中NH_4^+-N转化为NO_3^--N过程中的影响。结果表明,阿魏酸和苯甲酸对硝化作用的抑制率略高于对羟基苯甲酸,且阿魏酸随浓度升高而抑制作用加强。研究所采用的2种不同pH的土壤未表现出明显的差异;不同土壤含水量对转化为NO_3^--N的总量影响较大,不加水的土壤样品NO_3^--N的转化量很少,且随时间的推移其总量无多大变化,而他和含水量的样品NO_3^--N的转化量随时间的推迟其总量一直上升,说明水分对土壤中NO_3^--N的转化起着非常重要的作用。This paper describes the changes of soil nitrification affected by three allelochemicals-benzole acid, p-hydroxy benzoie acid and ferulic acid in different concentrations, soil moisture content and pH. The contents of NO3-N were determined at 1 day, 4 days, 7 days, 10 days and 14 days after the soil treated. The results showed that inhibiting rates of ferulic and benzoic acids were higher than that of p-hydroxy benzole acid on nitrification and the inhibiting effects of ferulic acid increased with the increase of allelochemical concentration. The soils with different pH didn' t show obvious difference in nitrification, because these soils were all close neutrality. The water content of soil affected total NO3--N. The normal soil samples inverted a few of NO3-N, while the inverting content of the water saturated soil samples increased with time. It indicates that the water content of soil is very important for nitrification.

关 键 词：化感物质 土壤硝化作用 影响 环境因子 

分 类 号：S153[农业科学—土壤学] S154.1[农业科学—农业基础科学]