土壤固定铵和钾过程中铵优先现象  

PREFRENTIAL FIXATION OF AMMONIUM TO POTASSIUM BY SOILS

作　　者：汤炎[1] 封克[1] 殷士学[1] 

机构地区：[1]江苏农学院农学系

出　　处：《江苏农学院学报》1996年第2期21-23,共3页Jiangsu Agricultural Research

基　　金：国家自然科学基金;江苏省教委自然科学基金

摘　　要：采自不同地区１０个土样先经盆栽黑麦草耗竭并去除根系过２ｍｍ筛作供试土样。再向土样中以摩尔比２．８：１同时加入Ｋ￣＋时，土壤的铵固定量比单加处理略有增加，新固定铵、钾摩尔比在６～１０之间。降低同时加入的：Ｋ￣＋摩尔比至１：１．４，新固定铵、钾摩尔比在１．３～２．０之间。先加钾１００ｍｇ／ｋｇ培养４８ｈ后，再加１００ｍｇ／ｋｇ续培养２ｈ，新固定铵、钾摩尔比在１～２．３之间。表明在本试验条件下，土壤有优先固定铵而少固定Ｋ￣＋的现象，无论Ｋ￣＋，同时加入还是Ｋ￣＋先加入者均如此。Ryegrass was cultivated on ten soils collected from different parts of China to deplete nutrients.After the rcots re-moval,the soils were used in a series of experiments to study fixation of and K￣+ by solls.When K￣+was added concurrentlywith or prior to,the soils were found to fix more moles of than those of K￣+,irrespective of the mole ratios of to K￣+ that were added.

关 键 词：铵固定 钾固定 土壤 

分 类 号：S154.34[农业科学—土壤学] S158.2[农业科学—农业基础科学]