作　　者： ; ; (朱剑云）; (叶永昌）;

机构地区： 华南农业大学林学院

出　　处： 《华南农业大学学报》 2006年第2期88-91,共4页

摘　　要： 依据对东莞林科园20个土壤剖面的调查取样,用电位法、碱解扩散法、氟化氨-盐酸浸提法、乙酸铵浸提-原子吸收法、重铬酸钾氧化-远红外加热法分别测定了土壤pH、速效N、速效P、速效K和有机质.在分析土壤养分总体特征的基础上,运用系统聚类的方法将东莞林科园土壤划分为6种养分类型:类Ⅰ为低肥力土壤;类Ⅱ为中氮土壤;类Ⅲ为高氮低磷土壤;类Ⅳ为富有机质的缺氮缺磷土壤;类Ⅴ属富磷高氮土壤;类Ⅵ属富氮土壤.其中,前3类是林科园的主要土壤养分类型.所划分的养分类型能反映各网格单元的地形特征及土地利用方式. Soil samples were collected from 20 profiles in Dongguan Forest Experimental Park, Dongguan, Guangdong Province. Soil pH was determined using electrometric method, available N was determined using NaOH hydrolyzable method, available P was determined using Bray I （0.03 mol/L NH4F-0.025 moL/L HCI extract） method, available K was determined using atomic absorption spectrophotometric method, and organic matter was determined using the dichromate oxidation （external heat applied） method. Six fertility types of the soils in Dongguan Forest Experimental Park were classified using cluster analysis, i. e. , low fertility soil, medium N-content soil, high-N and low-P soil, which are the major fertility types of soil in Dongguan Forest Experimental Park, soil rich in organic matter but deficient in N and P, soil rich in N and P, and N-rich soil. The classification of nutrient status reflects the topographic characteristics and land-use patterns of the respective sampling sites.

关 键 词： 土壤养分 土壤肥力 养分分级 聚类分析

领　　域： [农业科学]