中国土壤与肥料Issue(3)：1-11,11.DOI:10.11838/sfsc.1673-6257.25342
黄土高原半干旱区不同土地利用方式对土壤碳氮组分及碳氮储量的影响
Effects of different land use on soil carbon and nitrogen fractions and carbon and nitrogen storage in the semi-arid region of the Loess Plateau
摘要
Abstract
To investigate the differential regulation mechanisms of land use change on soil carbon and nitrogen fractions as well as carbon and nitrogen storage,this study took typical land use types(picea asperata:PA,hippophae rhamnoides:HR,Medicago sativa:MS,abandoned land:AL,and wheat field:WF)in the semi-arid region of the Loess Plateau in Longzhong as research objects in 2022.Through the combination of field positioning monitoring and indoor index analysis,the study explored the variation characteristics of soil physical properties,carbon and nitrogen fractions,and carbon and nitrogen storage in the 0-40 cm soil layer under different land use types.The results showed that,compared with the AL treatment,the soil porosity,water content,and water storage capacity of the PA treatment were increased by 1.45%,70.4%,and 73.4%,respectively;while the soil bulk density and pH value of the WF treatment were increased by 2.78%and 2.79%,respectively.The contents of soil organic carbon,dissolved organic carbon,easily oxidizable organic carbon,microbial biomass nitrogen,and soil dissolved organic nitrogenin each treatment were first increased and then decreased with the vegetation growth stage,and all decreased with the deepening of the soil layer.Furthermore,compared with the AL treatment,the PA,HR,and MS treatments significantly increased soil carbon and nitrogen storage;among which,the carbon storage was the highest under the PA treatment,reaching 15.6 t/hm2,while the nitrogen storage was the highest under the MS treatment,reaching 1.13 t/hm2.Correlation analysis showed significant correlations among soil physical properties,carbon and nitrogen fractions,and carbon and nitrogen storage.Redundancy analysis showed that soil bulk density and soil organic carbon content had the highest explanatory power for carbon and nitrogen storage,accounting for 38.2%and 26.0%,respectively.In summary,land use patterns significantly affected soil carbon and nitrogen dynamics in the Longzhong Loess Plateau.PA,HR,and MS treatments all significantly increased soil carbon and nitrogen stocks,among which PA treatments had a relatively better carbon sequestration effect and MS treatments had a relatively better nitrogen fixation capacity.This technical system could provide an important theoretical basis for land management oriented to"carbon sequestration,nitrogen fixation,and sink increase"in the semi-arid regions of the Loess Plateau.关键词
土地利用方式/碳组分/氮组分/碳、氮储量/植被恢复Key words
land use patterns/carbon fractions/nitrogen fractions/carbon-nitrogen storage/vegetation restoration引用本文复制引用
董亚斌,李婉婷,高树林,姚瑶,杜梦寅,李广,袁建钰..黄土高原半干旱区不同土地利用方式对土壤碳氮组分及碳氮储量的影响[J].中国土壤与肥料,2026,(3):1-11,11.基金项目
国家自然科学基金(32360438) （32360438）
甘肃省青年科技基金(25JRRA370) （25JRRA370）
甘肃省拔尖领军人才(GSBJLJ-2023-09) （GSBJLJ-2023-09）
博士后科学基金(GSAU-BH-2025-09). （GSAU-BH-2025-09）
