摘要
本文对云南、贵州和安徽三省区紫色土有机胶体组成和特性作了初步探讨,其共同特点是:三省区紫色土有机质含量均小于1%,普遍低于贵州的对照土壤—黄壤的有机质含量;紫色土腐殖质的HA/FA值均小于1,比其对照土壤—黄壤HA/FA值高;紫色土结合态腐殖质中松结态和稳结态较紧结态低,紧结态占重碳的50%以上。并且还分析了有机胶体与土壤肥力的关系。
The characteristics of organic matter,humus and combined humus of purple soils from Yunnan,Guizhou and Anhui provinces were analyzed,and were compared with that of yellow soil.The results showed:(i)the content of organic matter of some purple soils were less than 1?%and lower than that of the yellow soil from Guizhou province;(ii)the ratio of humic acid to fulvic acid(HA/?FA)in purple soil was lower than 1 and higher than that of the yellow soil from Guizhou province;(iii)the percentage of the loosly combined humus(H_1)and the stably combined humus(H_2)were both lower than the tightly combined humus(H_3)in purple soil;and (Ⅳ)the percentage of the tightly combined humus(H_3)was over 50?% in heavy fraction carbon.Furthermore,the relationship between organic colloid and fertility of purple soil was studied.
出处
《西南农业学报》
CSCD
2003年第4期85-89,共5页
Southwest China Journal of Agricultural Sciences
基金
中国科学院重点项目(KZ952-S1-206)
