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OA
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
为探究土地利用方式的转变对土壤碳、氮组分及碳、氮储量的差异化调控机制,以陇中黄土高原半干旱区典型土地利用方式(云杉林地:PA;沙棘林地:HR;苜蓿草地:MS;撂荒地:AL;小麦地:WF)为对象,通过野外定位观测与实验室理化分析相结合,探究不同土地利用方式对0～40 cm土层土壤物理性质、碳氮组分及碳氮储量的影响规律.结果表明,相较于AL处理,PA处理的土壤孔隙度、含水量和储水量分别增加了1.45%、70.4%、73.4%,而WF处理的土壤容重和pH值分别提高了2.78%、2.79%.土壤有机碳、溶解性有机碳、易氧化有机碳、微生物量氮及土壤溶解性有机氮含量在各处理下均随植被生长时间呈先增后降的趋势,且均随土层加深而逐渐降低.此外,与AL处理相比,PA、HR和MS处理显著增加了土壤碳、氮储量,其中,碳储量在PA处理下最高,为15.6 t/hm2,氮储量则在MS处理下最高,为1.13 t/hm2.相关性分析表明,土壤物理性质、碳氮组分和碳氮储量之间存在显著相关关系.冗余分析表明,土壤容重和土壤有机碳含量对碳、氮储量的解释率最高,分别为38.2%、26.0%.综上所述,土地利用方式显著影响了陇中黄土高原土壤碳、氮动态,PA、HR和MS处理均能显著提升土壤碳、氮储量,其中PA处理固碳效果较优,MS处理固氮能力较强.这一技术体系可为黄土高原半干旱区"固碳-固氮-增汇"的土地管理提供重要理论依据.
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.
董亚斌;李婉婷;高树林;姚瑶;杜梦寅;李广;袁建钰
甘肃农业大学林学院,甘肃 兰州 730070甘肃农业大学林学院,甘肃 兰州 730070甘肃农业大学林学院,甘肃 兰州 730070甘肃农业大学林学院,甘肃 兰州 730070甘肃农业大学林学院,甘肃 兰州 730070甘肃农业大学林学院,甘肃 兰州 730070||甘肃农业大学草业学院,甘肃 兰州 730070||干旱生境作物学国家重点实验室,甘肃 兰州 730070甘肃农业大学林学院,甘肃 兰州 730070||甘肃农业大学草业学院,甘肃 兰州 730070||干旱生境作物学国家重点实验室,甘肃 兰州 730070
土地利用方式碳组分氮组分碳、氮储量植被恢复
land use patternscarbon fractionsnitrogen fractionscarbon-nitrogen storagevegetation restoration
《中国土壤与肥料》 2026 (3)
1-11,11
国家自然科学基金(32360438)甘肃省青年科技基金(25JRRA370)甘肃省拔尖领军人才(GSBJLJ-2023-09)博士后科学基金(GSAU-BH-2025-09).
评论