土壤2009，Vol.41Issue(5)：719-725,7.
长期施肥潮土在玉米季施肥初期的有机碳矿化过程研究
Research on Process of Fluvo-Aquic Soil Organic Carbon Mineralization in Initial Stage of Maize Growth Under Long-Term Different Fertilization
摘要
Abstract
In a 37-day laboratory incubation study soil organic C mineralization was determined in soil samples obtained from initial stage of maize growth in an 18 year long-term field experiment which was carried out to evaluate nutrition equilibrium in a fluvo-aquic soil under different fertilization treatments. During the incubation time, cumulative CO_2-C released from soil was positively correlated to soil organic carbon, total nitrogen and microbial activity, which with a general decrease order of OM>1/2OM+1/2NPK>NPK>NP>PK>CK>NK. Amodified first-order model best described C mineralization in the soil. Potentially mineralized C (C_0), easily mineralized C (C_1) and the initial potential rate of C mineralization (C_0k) were significantly different among the treatments with a general decline order of organic manure treatments>mineral fertilizer treatments>control, which were positively correlated to soil organic carbon, total nitrogen and microbial activity. Mineralization rate (k) and potentially mineralized C divided by organic C (C_0:Organic C) were not significantly different among treatments, which were not correlated to soil organic carbon, total nitrogen and microbial activity except k was negatively correlated to organic carbon. Consequently, we conferred that long-term application of both organic manure (OM or 1/2OM+1/2NPK) and mineral fertilizers (except NK) to soil could significantly increase the mineralization of soil organic carbon, reflecting the differences in soil properties, thus increase the availability of soil mineral nutrients to crops and soil organic carbon content.关键词
长期不同施肥/土壤呼吸/土壤潜在可矿化有机碳/易矿化性有机碳量Key words
Long-term different fertilization/Soil organic carbon mineralization/Potentially mineralized C/Easily mineralized C分类
农业科技引用本文复制引用
陈吉,赵炳梓,张佳宝,沈林林,张辉,钦绳武..长期施肥潮土在玉米季施肥初期的有机碳矿化过程研究[J].土壤,2009,41(5):719-725,7.基金项目
中国科学院知识创新工程重要方向项目(KZCX2-YW-406-4),"十一五"国家科技支撑计划重点项目(2008BADA4B07)和中国科学院知识创新工程重大项目(KSCX1-YW-09-02和KSCX1-YW-09-05)资助. （KZCX2-YW-406-4）
