摘要
采用物理分组方法分析了长期不同施肥模式下红壤耕层(0~20cm)不同大小矿物颗粒结合态有机碳储量差异及其固定速率。结果表明,与不施肥相比,长期施肥均显著增加了耕层土壤砂粒、粗粉粒、细粉粒及粗黏粒结合有机碳的储量,且以配施有机肥(M、NPKM和1.5NPKM)效果最显著,固碳速率分别达到0.13~0.24、0.19~0.23、0.05~0.16及0.12~0.36Mg.hm-2.a-1;施化肥(NPK、NP、N)和秸秆还田(NPKS)有利于增加细黏粒有机碳储量,且固碳速率高于配施有机肥,分别达到0.08~0.13和0.11Mg.hm-2.a-1。17a有机肥配施有利于增加固存于粗粉粒(30.5%)和粗黏粒(30.7%)中的有机碳;而秸秆还田(NPKS)和化肥施用下,有利于增加固存于粗粉粒(32.9%)和细黏粒(42.9%)中的有机碳,说明无论化肥配施还是有机无机配施,红壤粗粉粒是固定新增有机碳的主要组分,而长期配施有机肥是提升红壤各级颗粒有机碳库的较好施肥模式。
The density fractionation scheme was used to study change characteristics of organic carbon stocks and sequestration rate of particle-size fractions in red soil under long-term fertilization. Our results showed that compared to non-fertilization (CK), long-term fertilization significantly increased the organic carbon stock that combined with sand( S ), coarse silt( CS ), fine silt( FS ), and coarse clay( CC ). Especially, applications with manure( M, NPKM, 1.5NPKM) showed highest carbon sequestration rate in S-OC(0.13-0.24 Mg·hm^-2·a^-1), CS(0.19-0.23 Mg·hm^-2·a^-1 ), FS ( 0.05-0.16 Mg·hm^-2·a^-1 ), and CC (0.12-0.36 Mg·hm^-2·a^-1 ), respectively. Applications of chemical fertilizers ( NPK, NP, N ) and straw incorporation were more effective to increase organic carbon in FC and the carbon sequestration rate were 0.08-0.13 and 0.11 Mg·hm^-2·a^-1 respectively, which were higher than the rates of applications with manure,. Applications with manure were apt to sequester more organic carbon in the CS( 30.5% ) and CC (30.7%) particles. However, application of straw incorporation (NPKS) and chemical fertilizers sequenstered more organic carbon in CS( 32.9% ) and FC(42.9% ) particles. Therefore, CS was the main carbon pool that sequestrated organic carbon in red soil under long-term fertilization. Moreover, long-term application with manure was helpful fertilization practices to increase Organic carbon in all particle-size fractions of red soil.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2009年第12期2584-2589,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金(40871148)
"十一五"国家重点科技支撑计划项目(2006BAD02A14
2006BAD05B09)
中央级公益性科研院所基本科研业务费专项资金(2009-17)
关键词
长期施肥
有机碳
储量
土壤颗粒
红壤
long-term fertilization
organic carbon
reserves
particle-size fractions
red soil