宁夏平罗县几种典型土壤修正系数的确定  

Determinating soil modification coefficient of several typical soils in Pingluo,Ningxia

作　　者：黄玉霞[1] 李新平[1] 毛文娟[1] 魏玉奎[1] 

机构地区：[1]西北农林科技大学资源与环境学院,陕西杨凌712100

出　　处：《干旱地区农业研究》2010年第5期124-128,共5页Agricultural Research in the Arid Areas

基　　金：日本COSMO石油株式会社资助项目

摘　　要：土壤修正系数是估算一个地区土壤生产潜力的关键。通过小麦盆栽实验,运用最低限制因子律模型对平罗县的盐土、碱土、改良盐碱土和灌淤土进行土壤修正系数的估算,得出盐土、碱土的修正系数分别为0.3045和0.2206,改良盐碱土为0.4806,灌淤土为0.6188。结果表明:灌淤土最适宜于种植,且它的生产潜力最高,改良盐碱土次之,盐土和碱土最小。土壤养分是这四种供试土壤生产潜力的主要限制因素;且土壤结构以及土壤盐分也是当地盐土和碱土生产潜力的主要限制因子,可通过适当的改良措施和合理施肥提高生产潜力。Determination of the soil modification coefficient is vital to evaluate the land potential productivity.Through a pot experiment of wheat,the model of lowest limited factor was used to estimate the modification coefficient of saline soil,alkali soil,modified saline-alkali soil and irrigation-silted soil in Pingluo.The results of the modification coefficient were 0.3045 in saline soil,0.2206 in alkali soil,0.4806 in modified saline-alkali soil,and 0.6188 in irrigation-silted soil.It showed that the irrigation-silted soil was suitable to plant,and its potential productivity was the highest,while saline soil and alkali soil were the lowest.Soil nutrient was the main limiting factor to potential productivity of the four tested soils,also soil structure and soil salt were major limiting factors for saline soil and alkali soil.We could use proper modified measures and rational fertilization to improve the potential productivity of tested soils.

关 键 词：平罗县 土壤修正系数 有效函数 土壤生产潜力 

分 类 号：S158[农业科学—土壤学]