摘要
选取第四纪红色粘土母质发育的不同肥力红壤样品，利用超声波分散技术分离出不同粒级有机无机复合体，进行氮素分布、铵吸附和解吸特性的研究。结果表明：全氮、重组氮和碱解氮主要分布在＜５μｍ各粒级复合体中，它们的富集率在＜２μｍ和２～５μｍ粒级复合体中大于１；而在５～１０μｍ和１０～５０μｍ复合体中小于１。全氮、重组氮和碱解氮的富集率随复合体粒级增大而减少。高肥力红壤各粒级有机无机复合体的铵吸附量、铵解吸量和铵解吸率均大于低肥力红壤。随着复合体粒级增大，铵吸附量和铵解吸量减小，铵解吸率增大。
Organo mineral complexes in various size fractions from different fertility red soilsderived from Quaternary red clay were separated by ultrasonic dis persion in water.The N distribution,ammonium adsorption and desorption characteristic oforgano mineral complexes were studied and reported in this paper. The results obtainedare summarized as follows:Total N,heavy fraction N,and alkali hydrolyzabale N ofred aoils were mainly distributed in<5μm complexes,their accumulating rates beingabove 1 in<2μm and 2～5μm complexes while below 1 in 5～10μm and 10～50μmcomplexes. With the increase of particle size of complexes,the accumulating rates of to-tal N ,heavy fraction N and alkali-hydrolyzable N decreased.The ammonium adsorptioncapacity,desorption capacity and desorption rate in various fractions of complexes ofhigh fertility red soils were higher than those of low fertility ones.With increasing par-ticle size of complexes, ammonium adsorption and desorption capacity be camesmaller,but ammonium desorption rate larger。
出处
《华南农业大学学报》
CAS
CSCD
1995年第4期64-68,共5页
Journal of South China Agricultural University
关键词
红壤
有机无机复合体
氮
铵
吸附
解吸
red soil
organo mineral complex
N distribution
ammonium adsorption and desorption
ultrasonic dispersion.
