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我国北方一些土壤对外源钾的固定
引用本文:黄绍文,金继运.我国北方一些土壤对外源钾的固定[J].植物营养与肥料学报,1996,2(2):131-138.
作者姓名:黄绍文  金继运
作者单位:1.中国农业科学院土壤肥料研究所 北京 100081
摘    要:本文研究了我国北方农区主要土壤的固钾能力。结果表明,在施K量0-4000mg/kg范围内,土壤固钾量与施钾量的关系符合方程y=ax3/2/(x3/2+b)。不同土壤固钾量相差很大,其固钾量与土壤矿物学性质和理化性质(粘粒含量、CEC、非交换性钾和速效钾含量)有关,与原始土壤非交换性钾含量呈显著负相关(不同施钾水平下土壤固钾量与非交换性钾含量之间的相关系数均在-0.6769* *以上)。供试土壤固钾能力表现出一定的地带性分布规律。施K1200mg/kg以下时土壤固钾能力的一般趋势是取自西北的土壤取自东北的土壤取自华北的土壤;而施K1200mg/kg以上时土壤固钾能力,从西向东呈逐渐增加的趋势。取自西北地区的土壤,固钾量(施K量为400~4000mg/kg,下同)平均为133~348mg/kg,最大同钾量平均是372mg/kg;取自华北地区的土壤,其固钾量平均为235~1001mg/kg,最大固钾量平均是1121mg/kg;取自东北地区的土壤,其固钾量平均为199~1254mg/kg,最大固钾量平均是1519mg/kg。

关 键 词:土壤    外源钾    最大固钾量    固钾率    拟合方程

POTASSIUM FIXATION IN SELECTED SOILS FROM NORTH CHINA
Huang Shaowen Jin Jiyun.POTASSIUM FIXATION IN SELECTED SOILS FROM NORTH CHINA[J].Plant Nutrition and Fertilizer Science,1996,2(2):131-138.
Authors:Huang Shaowen Jin Jiyun
Affiliation:1.Soil and Fertilizer Institute. CAAS;Beijing 100081
Abstract:Potassium fixation by soils was studied for 25 soil samples taken from major agricultural regions of north China with 0~4000 mg K added to each kilogram of soil. Potassium fixation can be well discribed by an equation y=ax3/2/(x3/2+b) (y is the amount of K fixed in mg/kg, x is the amount of K added in mg/kg, a is an estimation of maximum potassium fixation in mg/kg, b is a constant ). Fixation power of the various soils differred significantly, the amount of K fixed was closely related to the types and the amount of clay minerals existing in the soil, and physical and chemical properties (clay content, CEC, non-exchangeable K and available K levels). Potassium fixation by soils was negatively correlated with non-exchangeable K content of the soils. Soils taken from different regions showed different K fixation characteristics. When K application level was below 1200mg/kg soil, capacity of K fixation of these tested soils followed a general order: soils from northwestern region < soils from northeastern region < soils from northcentral region;while K added was above 1200mg/kg, K fixation power of the soils showed a general tendency: soils taken from northwestern region < soils from northcentral region < northeastern region. When 400~4000 mg K was added to one kilogram of soil, on average, 133 ~ 348 mg / kg were fixed by soils from northwestern region with an average maximum fixation of 372 mg/kg; 235~1001mg/kg were fixed by soils from northcentral region with an average maximum fixation of 1121 mg/kg; 199-1254 mg/kg were fixed by soils from northeastern region with an average maximum fixation of 1519 mg/kg soil.
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