中国生态农业学报（中英文）2025，Vol.33Issue(7)：1301-1310,10.DOI:10.12357/cjea.20240427
秸秆还田与施氮对褐土水稳性团聚体及有机碳和全氮分布的影响
Effects of straw returning and nitrogen application on water-stable aggregate and distribution of organic carbon and total nitrogen in brown soil
摘要
Abstract
Aggregates are the basic units of soil structure and are important factors affecting soil quality.Their formation is influ-enced by agricultural management practices and environmental conditions,leading to variation in structure across different regions and soil types.Brown soil is one of the main soil types in Hebei Province and understanding the influence of long-term wheat-maize rotation on the formation of soil aggregates is essential for improving soil quality and enhancing grain storage in the ground.This study was based on a long-term experiment involving straw return and nitrogen application in a brown soil region,aiming to determ-ine their effects on the water stability and composition of soil aggregates,as well as the soil organic carbon(SOC)and total nitrogen(TN)content at different particle sizes.Four treatments-straw returning without nitrogen fertilizer(CK),traditional nitrogen fertil-izer with straw returning(CON),optimized nitrogen fertilizer with straw returning(OPT)and traditional nitrogen fertilizer with straw removal(CON-S)—were selected to study the effects of nitrogen application and straw return on the water stability of brown soil ag-gregate composition and soil organic carbon(SOC)and total nitrogen(TN)content at different particle size levels.Four types of ag-gregates with different particle sizes were obtained using the wet-screening method.The SOC and TN contents within different ag-gregates sizes were measured,and the composition and stability of water-stable aggregates under different treatments were analyzed.Additionally,the contribution of each aggregate size class to overall SOC and TN content was calculated to evaluate their respective roles in nutrient distribution.The results showed that soil pH and calcium carbonate content were positively correlated with the stabil-ity of soil aggregates,which significantly promoted the formation of soil water-stable macroaggregates and improved the stability of water-stable aggregates;however,nitrogen application had no significant effect on the stability of water-stable aggregates under straw return.Under the same nitrogen application conditions,the SOC content of the soil aggregates was significantly increased by straw re-turn,and the SOC content of the water-stable soil aggregates was significantly increased by nitrogen application.Nitrogen applica-tion significantly increased the TN content of aggregates at all levels,and straw return significantly increased the TN content of water-stable aggregates at all levels under the same nitrogen application conditions.The SOC and TN contents in the water-stable aggreg-ates decreased with decreasing water-stable aggregate particle size.Compared with straw removal,straw return significantly in-creased the contribution rates of SOC and TN in water-stable aggregates＞2 mm and 0.25-2 mm,while reducing their contribution in the 0.053-0.25 mm and＜0.053 mm fractions.However,nitrogen application had no significant effect on the SOC and TN contribu-tions of the water-stable aggregates.There were no significant differences in the water-stable aggregate composition and SOC and TN contents between optimal and traditional fertilization treatments.In summary,in brown soil areas,soil stability and fertility can be im-proved by optimizing nitrogen application under straw return measures.关键词
褐土/水稳定性团聚体/秸秆还田/施氮/有机碳/全氮Key words
brown soil/water-stable aggregate/straw returning/nitrogen application/organic carbon/total nitrogen分类
农业科技引用本文复制引用
肖广敏,刘蕾,王雪晴,王策,赵欧亚,侯利敏,茹淑华,王凌,孙世友..秸秆还田与施氮对褐土水稳性团聚体及有机碳和全氮分布的影响[J].中国生态农业学报（中英文）,2025,33(7):1301-1310,10.基金项目
国家重点研发计划项目(2022YFD1901304-10)、河北省农林科学院科技创新专项(2022KJCXZX-ZHS-10)和河北省农林科学院博士基金项目(C22R1101)资助 This study was supported by the National Key Research and Development Program of China(2022YFD1901304-10),Science and Technological In-novation Special Project of Hebei Academy of Agriculture and Forestry Sciences(2022KJCXZX-ZHS-10),and the Doctoral Foundation of Hebei Academy of Agriculture and Forestry Sciences(C22R1101). （2022YFD1901304-10）
