小麦秸秆添加对不同类型土壤有机碳矿化的影响  

Effects of wheat straw addition on organic carbon mineralization in different types of soils

作　　者：余洁 苗淑杰[1] 乔云发[1] 李天 王校益 赵玉蝶 YU Jie;MIAO Shujie;QIAO Yunfa*;LI Tian;WANG Xiaoyi;ZHAO Yudie(School of Ecology and Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学生态与应用气象学院,南京210044

出　　处：《农业环境科学学报》2024年第9期2041-2049,共9页Journal of Agro-Environment Science

基　　金：国家自然科学基金面上项目(42177279);江苏省碳达峰碳中和科技创新专项(BE2022312)。

摘　　要：为探究在相同培养条件下,小麦秸秆添加对不同类型土壤有机碳矿化的影响,本研究采用室内培养法,向黑土、风沙土、紫色土和黄棕壤添加小麦秸秆,以揭示不同类型土壤有机碳矿化对外源碳添加的响应机制差异。结果表明:与未添加秸秆处理相比,添加秸秆处理的4种土壤有机碳矿化速率均表现为前21 d显著增加,之后趋于稳定。在培养的前7 d,4种土壤CO_(2)累积排放量迅速增加2.41~3.87倍,此后持续稳步增加;培养结束后,未添加秸秆的4种土壤间CO_(2)累积排放量未见显著差异;添加秸秆处理各土壤CO_(2)累积排放量显著增加,较未添加秸秆提升2.52~3.41倍,其中紫色土CO_(2)累积排放量显著低于其他3种类型土壤,为2760.74 mg·kg^(-1),黑土增加最显著,为4168.99 mg·kg^(-1)。相关分析表明,无论是否添加秸秆,土壤有机碳的矿化率均受到全氮的主导作用,且二者具有显著负相关关系。无论是否添加秸秆,土壤CO_(2)累积排放量均主要受到土壤pH的影响,且与pH呈显著负相关;添加秸秆处理中CO_(2)累积排放量还同时受到土壤C/N的正向作用。研究表明,同一种秸秆添加到不同类型土壤中时,土壤本身性质的差异会导致土壤有机碳矿化对其的响应也存在差异,因此在实际秸秆还田时需要依据不同土壤特性制定合理的秸秆还田措施。In order to explore the effects of wheat straw addition on the mineralization of organic carbon in different types of soils under the same culture conditions,this study used the indoor culture method to add wheat straw to black soil,windy sandy soil,purple soil,and yellow-brown soil.We aimed to investigate the dynamic changes in soil organic carbon mineralization and to elucidate the differences in the mechanism of the response to exogenous carbon addition in different types of soil organic carbon mineralization.The results showed that the soil organic carbon mineralization rates in all four soil types with straw addition increased significantly in the first 21 days and then stabilized compared with those observed without straw addition.In the first 7 days of incubation,the cumulative soil CO_(2)emissions increased rapidly by 2.41~3.87 times and then increased steadily and continuously.At the end of the incubation period,no significant difference was noted in the cumulative CO_(2)emissions of the four types of soils without straw.The cumulative CO_(2)emissions of all soils in the straw treatment were significantly increased by 2.52~3.41 times compared with those of the soils without straw.The cumulative CO_(2)emissions of the purple soil was significantly lower than that of the other three types of soil at 2760.74 mg·kg^(-1)and that of the black soil was significantly higher at 4168.99 mg·kg^(-1).Correlation analysis showed that total nitrogen dominated the mineralization rate of soil organic carbon with or without straw addition,and the two exhibited a significant negative correlation.Regardless of whether straw was added or not,the cumulative emission of soil CO_(2)was mainly influenced by soil pH and was significantly negatively correlated with pH.The cumulative emission of CO_(2)in response to the straw-added treatments was also positively affected by soil C/N simultaneously.When the same kind of straw is added to different types of soils,the response of soil organic carbon mineralization will vary,reflecti

关 键 词：有机碳 土壤类型 秸秆 动态变化 理化性质 

分 类 号：S153.6[农业科学—土壤学]