摘要
以棉花秸秆为试材,采用傅里叶红外光谱(FTIR)分析方法,用盐碱化荒地作为对照(0年),设置棉花秸秆还田5、10、15、20年棉田4个处理,研究棉秆还田条件下土壤有机碳(SOC)化学结构的变化趋势,以期为研究外源有机物添加下土壤有机碳固持提供参考依据。结果表明:长期棉秆还田显著提升了土壤有机碳含量和20~40 cm土层土壤含水率,降低了土壤电导率。随棉秆还田年限的延长,土壤有机碳脂族性呈现出先升高后降低的趋势,还田15年最高。还田20年土壤有机碳芳香性升高,有机碳结构由简单变为复杂。总体来看,长期棉秆还田使土壤有机碳化学结构简单化。
Taking cotton straw as the test material and fourier transform infrared spectroscopy(FTIR)analysis method,with saline alkali wasteland as the control(0 year),the basic physicochemical properties and organic carbon chemical structure of cotton field soil after 5,10,15 years,and 20 years of cotton straw return were set,the change trend of soil organic carbon(SOC)structure under the condition of cotton stalk returning to field was studied,in order to provide reference for studying soil organic carbon sequestration under the addition of exogenous organic matter.The results showed that long-term cotton straw returning significantly increased soil organic carbon content,while the soil moisture content in the 20-40 cm soil layer was also increased,reducing soil conductivity.With the extension of the cotton straw returning period,the soil organic carbon lipid group characteristics showed a trend of first increasing and then decreasing,with the highest value after returning for 15 years.After returning straw to the field for 20 years,the soil organic carbon aromaticity increased,and the organic carbon structure changed from simple to complex.Overall,long-term return of cotton stalks to the field simplifies the chemical structure of soil organic carbon.
作者
康博
张军
唐鹏飞
张凤华
KANG Bo;ZHANG Jun;TANG Pengfei;ZHANG Fenghua(Key Laboratory of Oasis Ecological Agriculture of Xinjiang Production and Construction Corps,Shihezi University,Shihezi,Xinjiang 832061)
出处
《北方园艺》
CAS
北大核心
2024年第10期78-84,共7页
Northern Horticulture
基金
新疆维吾尔自治区重点研发计划资助项目(2022B02020)。
关键词
棉秆还田
土壤有机碳
红外光谱
官能团
稳定性
returning straw to the field
soil organic carbon
infrared spectroscopy
functional groups
stability
