不同施肥处理对旱地红壤团聚体中有机碳含量及其组分的影响  

EFFECT OF FERTILIZATION ON ORGANIC CARBON CONTENT AND FRACTIONATION OF AGGREGATES IN UPLAND RED SOIL

作　　者：徐江兵[1] 李成亮[1] 何园球[1] 王艳玲[1] 刘晓利[1] 

机构地区：[1]中国科学院南京土壤研究所

出　　处：《土壤学报》2007年第4期675-682,共8页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(406701108)资助

摘　　要：借助筛分、浮选等物理分组和化学分析方法研究了不同施肥处理下旱地红壤团聚体中不同有机碳组分的差异。结果表明:长期施肥显著地提高了土壤中总有机碳含量(TOC)和团聚体中轻组有机碳(LF-C)、团聚体内粗颗粒有机碳(CF-C)、团聚体内细颗粒有机碳(FF-C)和矿物结合态有机碳(mSOC)的含量,且各有机碳组分与TOC均呈极显著相关;团聚体中有机碳含量随团聚体的粒级减小而降低,厩肥处理的促进效果最明显;团聚体中有机碳主要以mSOC形式存在。有机肥的施入降低了大团聚体的周转,秸秆处理对团聚体的形成和稳定效果优于厩肥处理;在红壤地区有机无机肥配施使得有机碳在团聚体形成及稳定方面的作用得以加强。Physical fractionation and chemical analysis were conducted of upland red soils different in fertilization combination to study variation of organic carbon fractions in aggregates 〉 2 000,250 -2 000,53- 250 and 〈 53μm in particle size. Resuits show that long-term combined application of organic manure and inorganic fertilizer could significantly increase content of total organic carbon in soil（TOC）and content of organic carbon in light fraction（ LF-C）, coarse fraction（ CF-C）, inside particle organic carbon-fine（ FF-C）and mineral-associated organic carbon（mSOC） in aggregates of all sizes. And organic carbon contents in various fractions of aggregates were significantly related to TOC. Content of organic carbon in aggregates decreased with the decreasing particle size of aggregates. Application of livestock manure significantly improved SOC content, dominated with mineralassociated organic carbon. Application of organic manure reduced turnover rate of macro-aggregates, and incorporation of crop residues contributed more than application of organic manure to formation and stability of aggregates. In the red soil region, the effect of long-term combined application of organic manure and inorganic fertilizer on formation and stability of aggregates should be intensified.

关 键 词：团聚体 有机碳 不同施肥处理 旱地红壤 

分 类 号：S158.3[农业科学—土壤学] S152.4[农业科学—农业基础科学]