關(guān)鍵詞:土壤總碳;土壤總氮;土地利用類型;空間分布;半方差分析中圖分類號:S153.6 文獻(xiàn)標(biāo)志碼:A 文章編號:2095-6819(2025)05-1289-10 doi:10.13254/j.jare.2024.0350
Impact of different landuse types on the concentrations and spatial distribution characteristics ofcarbon and nitrogen elementsin soil
WANG Mingkun1,LI Xiulong2,TONG Yindong3,LI Zhenxin3,4*
(1.EcologicalEviroentureaufLiianCoutybabetanadiangutoomousrefecture,icanProvince,iia10, China;2.ChangchunCollgeofElectronicTechnology,Changchun30o51,China;3.SchoolofEcologyandEnvironment,ibet University,hasa85Oo,China;4.choolofEnvironment,NortheastNoralUniversityhangchun3017,ina) Abstract:Landusechangeiscucialfactoregulatigcarbonandnirogensourcsinkfunctiosinterrestrialosstes.Tolucidate thehorizontalandeticaldistrbutiocaracteisticsndcontetdiferencsofabonndrognelementsinsoilsuderttycal landusetypes(gassland,oodand,andrland)inaarididegion,tissudyeplodagidmpgthd. Totalcarbondotalrgeotsreeaurdat36pgpsrossisls(0-3046 cm,and 60-10Ocm)foreachlandusetype.One-wayANOVAwasusedtocomparecarbonandnitrogencontent diferencesamongsoil layersintetesoiltypes,futhrexploingtirerticaldistrbutonaractersticsSemvaranceaalysisandKrigingieolation wereutlizedtoalythspatialterogeeitypatesofarbonadnrogenelmntsinttopsoilofteelndusetsesults showed that the variabilityin total carbon content in the topsoil( 0-10cm )of woodland wassignificantly higher than that of grassland and farmland.oweerabilityinotalroenotetisixsoillasfasladoseagraatiodlad andfarmland.Amongthteelandusetys,everticaldstributionoftotalsoilcarboningrassnddidotsowdecreasingtrdih increasingdepth,hilewoodandandrandlsgenealyehbiteddcreasingtrendoftotalcarbonwithpthInthecsoil layer, grassland soil had the highest total carbon content ( 1.50%±0.23% ),approximately twice that of woodland ( 0.75%±0.10% )and 1.4 timesthatof farmland( 1.04%±0.12% ).Woodland soil had the highest total nitrogen content( 0.53%oo±0.09%o ),about1.8timesthatof grassland ( 0.30%o±0.06% )and1.4times that of farmland ( 0.38%o0.06% ).Semi-variance analysis results indicated strong spatial autocorrelationfoarboadrogenlementsinthpsoilofallandusetseeptfootalrbonioodlandtopsilich showedmoderatespatialutocoelationThsudydmonstratestatinsemidtosumidrgios,ativeassandostms havehigher carbon sequestration potential compared with woodlandand farmland.
Keywords:soil totalcarbon;soil totalnitrogen;land-use type;spatial distribution;semivariogramanalysis
自工業(yè)革命以來,人類活動以及土地利用的快速變化正在顯著影響土壤圈中碳氮循環(huán)過程。IPCC(聯(lián)合國政府間氣候變化專門委員會)評估報告和大量已有研究表明,全球變暖主要由溫室氣體(如二氧化碳、甲烷、一氧化二氮等)濃度增加引起[-2。這些氣體濃度的上升,尤其是二氧化碳和甲烷,主要源于人類活動導(dǎo)致的全球碳生物地球化學(xué)循環(huán)改變。其中,土地利用方式的變化、植被組成和土壤管理活動對碳封存的生物過程影響顯著3]。據(jù)IPCC的估算[4],全球陸地生態(tài)系統(tǒng)的碳貯存量約為 2200Pg ,其中土壤有機碳的貯量約為 1500Pg ,土壤無機碳的貯量據(jù)估計約為 700~1000Pg[5] 。作為地球上最為重要的一種生物化學(xué)循環(huán)過程,碳循環(huán)直接影響著人類發(fā)展和生態(tài)系統(tǒng)的穩(wěn)定。土壤碳循環(huán)的過程及土壤碳庫變化-全球氣候變化-土地利用變化之間存在著復(fù)雜的交互作用。與碳循環(huán)密切相關(guān)的氮循環(huán)同樣至關(guān)重要,溫室氣體中 N2O 的排放受到土壤中氮的生物地球化學(xué)循環(huán)的直接影響。土壤氮庫是整個陸地生態(tài)系統(tǒng)氮庫的主體,土壤氮儲量約是植物氮儲量的3倍,在部分森林生態(tài)系統(tǒng)中,土壤氮儲量甚至可以占到整個生態(tài)系統(tǒng)氮儲量的 90% 以上。土壤氮庫的變化不僅對生態(tài)系統(tǒng)氮循環(huán)產(chǎn)生重要影響,而且受到氣候變化和土地利用變化的反饋作用。鑒于土壤碳氮循環(huán)復(fù)雜性及其在生態(tài)系統(tǒng)中的作用,研究土地利用變化下土壤碳氮儲量的變化規(guī)律對于實現(xiàn)土地可持續(xù)管理和生態(tài)系統(tǒng)功能維持具有重要意義[8]。……