Maize straw application as an interlayer improves organic carbon and total nitrogen concentrations in the soil profile: A four-year experiment in a saline soil

作     者：CHANG Fang-di WANG Xi-quan SONG Jia-shen ZHANG Hong-yuan YU Ru WANG Jing LIU Jian WANG Shang JI Hong-jie LI Yu-yi CHANG Fang-di;WANG Xi-quan;SONG Jia-shen;ZHANG Hong-yuan;YU Ru;WANG Jing;LIU Jian;WANG Shang;JI Hong-jie;LI Yu-yi

作者机构：Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China The Norwegian Institute of Bioeconomy Research(NIBIO)As 1431Norway Department of Soil and Plant MicrobiomeInstitute of PhytopathologyChristian-Albrechts-University of KielKiel 24118Germany 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2023年第22卷第6期

页      面：1870-1882页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：funded by the National Natural Science Foundation of China (31871584) the Agricultural Science and Technology Innovation Program, Chinese Academy of Agricultural Sciences (CAAS-ZDRW202201) the Fundamental Research Funds for Central Non-profit Scientific Institution, China (1610132020011) the “Open the list” in charge of the Science and Technology Project of Ordos, Center for Agro-pastoral Ecology and Resource Conservation of Ordos City, Inner Mongolia, China (JBGS2021-001) the Inner Mongolia Autonomous Region Research Project (2021EEDSCXSFQZD011) 

主　　题：straw addition interlayer soil organic carbon soil nitrogen C:N ratio saline soil 

摘      要：Soil salinization is a critical environmental issue restricting agricultural *** return of straw to the soil as an interlayer (at 40 cm depth) has been a popular practice to alleviate salt ***,the legacy effects of straw added as an interlayer at different rates on soil organic carbon (SOC) and total nitrogen (TN) in saline soils still remain ***,a four-year (2015–2018) field experiment was conducted with four levels (i.e.,0,6,12and 18 Mg ha~(–1)) of straw returned as an *** with no straw interlayer (CK),straw addition increased SOC concentration by 14–32 and 11–57%in the 20–40 and 40–60 cm soil layers,*** increases in soil TN concentration (8–22 and 6–34%in the 20–40 and 40–60 cm soil layers,respectively) were lower than that for SOC concentration,which led to increased soil C:N ratio in the 20–60 cm soil *** in SOC and TN concentrations in the 20–60 cm soil layer with straw addition led to a decrease in stratification ratios (0–20 cm:20–60 cm),which promoted uniform distributions of SOC and TN in the soil *** in SOC and TN concentrations were associated with soil salinity and moisture regulation and improved sunflower ***,compared with other treatments,the application of 12 Mg ha~(–1) straw had higher SOC,TN and C:N ratio,and lower soil stratification ratio in the2015–2017 *** results highlighted that legacy effects of straw application as an interlayer were maintained for at least four years,and demonstrated that deep soil straw application had a great potential for improving subsoil fertility in salt-affected soils.