秸秆还田下褐土易氧化有机碳及有机碳库的变化特征  

Variation Characteristics of Readily Oxidizable Organic Carbon and Soil Organic Carbon Pools under Straw Returning Modes in Cinnamon Soil

作　　者：史康婕 周怀平[2] 解文艳[2] 杨振兴[2] 程曼[2] 

机构地区：[1]山西大学生物工程学院,山西太原030006 [2]山西省农业科学院农业环境与资源研究所,山西太原030031

出　　处：《山西农业科学》2017年第1期83-88,共6页Journal of Shanxi Agricultural Sciences

基　　金：农业部公益性行业(农业)科研专项(201203030-08-03);山西省科技攻关项目(20150311016-1)

摘　　要：研究长期秸秆还田对褐土土壤有机碳(TOC)含量、有机碳储量(TOCs)与固碳速率(DTOC)、易氧化有机碳(ROOC)含量和碳库管理指数(CPMI)的影响,为评价土壤质量、固碳减排、培肥土壤提供理论依据。基于北方旱地连续24 a不同秸秆还田方式下春玉米长期定位试验,选择4个处理(秸秆不还田(CK)、长期秸秆覆盖还田(SM)、秸秆粉碎还田(SC)和秸秆过腹还田(CM))进行分析,通过测定土壤TOC与ROOC含量来确定碳库变化特征。结果表明,秸秆还田处理对0~20 cm土层TOC含量与ROOC含量影响显著,且先降低然后向一个新的平衡移动;CM处理对TOCs的维持最有利,SM,SC处理也对TOCs有显著的积极影响;DTOC表现为净释放,但CK处理的有机碳释放速率为秸秆处理的180.99%~135.57%;CM处理的CPMI值显著高于其他处理,且比CK高62.33%;碳库管理指数与易氧化有机碳含量呈显著正相关。可见,秸秆还田处理可极显著影响土壤有机碳固存,减少有机碳的释放,使土壤性质向良性发展,有利于培肥土壤、保护环境。The study on soil total organic carbon（TOC）content, soil total carbon storage（TOCs）and sequestration rate（DTOC）,readily oxidizable organic carbon（ROOC）content and carbon pool management index（CPMI）under long-term straw returning modes in cinnamon soil will provide theoretical basis for evaluation of soil quality, scientific application of fertilization and improving soil fertility.The study was based on the long-term straw returning modes experiment of cinnamon soil in Shouyang county, Shanxi province. Soil samples were collected from four treatments： no straw returning（CK）, straw mulching（SM）, straw crushing（SC）and cattle manure（CM）. The change of organic carbon pool was determined by measuring TOC and ROOC. The results showed that in 0-20 cm, TOC contents and ROOC contents were influenced significantly under the straw returning treatments, and achieved a new balance after the first decreases with time. It was the most advantageous to TOCs of maintaining which of CM. SM and SC also had a significant positive effect on TOCs. But DTOC was released, and released rate of CK treatment was more 80.99%-35.57% than straw returning treatments. The CM treatments was more 62.33% than CK treatment for CPMI. In conclusion, straw returning treatments can significantly affect the soil organic carbon sequestration, reduce the release of organic carbon, make soil properties to benign development, improve soil fertility and protect the environment.

关 键 词：秸秆还田 有机碳储量 碳库管理指数 固碳速率 土壤有机碳 易氧化有机碳 

分 类 号：S141.4[农业科学—肥料学]