典型滨岸草地生态系统碳稳定同位素组成及分布特征
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摘要
通过测定上海市青浦区东风港百慕大、白花三叶草、高羊茅和白茅等4种典型滨岸草本植物各组织以及不同垂直深度土壤有机质δ~(13)C值,对滨岸草地生态系统的植物-土壤碳稳定同位素特征进行了分析.结果表明:白花三叶草、高羊茅属于C3植物,百慕大、白茅属于C4植物,其茎叶、凋落物和根系各组织间δ~(13)C值无显著差异.C3和C4植物样带表层土壤有机质δ~(13)C值随着土壤深度递增而呈现截然不同的变化特征,这与样带本底δ~(13)C值以及碳稳定同位素分馏效应有关,同时还受植物根系分布深度的影响.植物输入是土壤有机碳(SOC)的最主要来源,植物有机体δ~(13)C组成对土壤有机质δ~(13)C值有直接影响,植物各组分δ~(13)C值与土壤有机质δ~(13)C值均存在极显著相关.4种草本植物样带SOC含量与δ~(13)C值均呈极显著相关,其中,C3植物样带SOC含量与δ~(13)C值呈线性负相关,C4植物样带SOC含量与δ~(13)C值呈线性正相关.
Plant-soil carbon stable isotope characteristics of riparian herbaceous ecosystem were analyzed by measuring the δ~(13)C value of plant tissues from four typical riparian herbaceous plants,which were Cynodon dactylon,Trifolium repens,Festuca arundinacea and Imperata cylindrical,and that of soil organic carbon( SOC) from different vertical depths along Dongfeng Port River in Qingpu District,Shanghai. The result showed that T. repens and F. arundinacea were C3 plants while C.dactylon and I. cylindrical were C4 plants. There was no significant difference between the δ~(13)C value of stem and leaf,litter and root of the four herbaceous plants. The surface SOC δ~(13)C value of C3 and C4 plants strips showed different trends with soil depth,which could be related to the background SOC δ~(13)C value,soil carbon stable isotope fractionation effect and plant root distribution depth as well. Plant input was the main source of SOC and the δ~(13)C composition of plant organisms had direct effect on the SOC δ~(13)C value. The δ~(13)C value of plant components were significantly correlated with the δ~(13)C value of SOC. The SOC content and δ~(13)C value were significantly correlated in the four herbaceous plants strips. The SOC content and δ~(13)C value showed linear negative correlation in C3 plant strips and linear positive correlation in C4 plant strips.
Plant-soil carbon stable isotope characteristics of riparian herbaceous ecosystem were analyzed by measuring the δ~(13)C value of plant tissues from four typical riparian herbaceous plants,which were Cynodon dactylon,Trifolium repens,Festuca arundinacea and Imperata cylindrical,and that of soil organic carbon( SOC) from different vertical depths along Dongfeng Port River in Qingpu District,Shanghai. The result showed that T. repens and F. arundinacea were C3 plants while C.dactylon and I. cylindrical were C4 plants. There was no significant difference between the δ~(13)C value of stem and leaf,litter and root of the four herbaceous plants. The surface SOC δ~(13)C value of C3 and C4 plants strips showed different trends with soil depth,which could be related to the background SOC δ~(13)C value,soil carbon stable isotope fractionation effect and plant root distribution depth as well. Plant input was the main source of SOC and the δ~(13)C composition of plant organisms had direct effect on the SOC δ~(13)C value. The δ~(13)C value of plant components were significantly correlated with the δ~(13)C value of SOC. The SOC content and δ~(13)C value were significantly correlated in the four herbaceous plants strips. The SOC content and δ~(13)C value showed linear negative correlation in C3 plant strips and linear positive correlation in C4 plant strips.
引文
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[6]Wang M(王敏),Huang Y-C(黄宇驰),Wu J-Q(吴建强).Quantification study on the runoff and seepage distribution and N,P pollutants removal of the vegetated buffer strips.Environmental Science(环境科学),2010,31(11):2607-2612(in Chinese)
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[15]Balesdent J,Mariotti A,Guillet B.Natural13C abundance as a tracer for studies of soil organic matter dynamics.Soil Biology&Biochemistry,1987,19:25-30
[16]Navarro-Fernndez CM,Madejón P,Domínguez MT,et al.Isotopic composition of C(δ13C)and N(δ15N)in leaves,roots and soil underneath of seven afforested tree species in the Guadiamar Green Corridor(SW Spain).Comunicaciones Congresos,2015,4:16-19
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[18]Fujio H,Soichiro K,David AW,et al.Changes in stable nitrogen and carbon isotope ratios of plants and soil across a boreal forest fire chronosequence.Plant and Soil,2013,367:111-119
[19]Xu W-Q(许文强),Chen X(陈曦),Luo G-P(罗格平),et al.Progress of research on soil carbon cycle using carbon isotope approach.Arid Land Geography(干旱区地理),2014,37(5):980-987(in Chinese)
[20]Yu G-R(于贵瑞),Wang S-Q(王绍强),Chen P-Q(陈泮勤),et al.Isotope tracer approaches in soil organic carbon cycle research.Advances in Earth Science(地球科学进展),2005,20(5):566-577(in Chinese)
[21]Zhang L(张林),Sun X-Y(孙向阳),Cao J-X(曹吉鑫),et al.Transfer of soil organic carbon to soil inorganic carbon in carbonate rock soil of desert grassland.Arid Land Geography(干旱区地理),2010,33(5):732-739(in Chinese)
[22]Zhu S-F(朱书法),Liu C-Q(刘丛强),Tao F-X(陶发祥),et al.Geochemical characteristics of stable carbon isotopes in soil organic matter from Karst areas.Earth and Environment(地球与环境),2006,34(3):51-58(in Chinese)
[23]Li Y-Y(李阳阳),Wang Q(王琴),Cui L-L(崔琳琳),et al.Differences inδ13C values of bulk organic matter from Chinese loess obtained using two analytic methods.Journal of Earth Environment(地球环境学报),2012,3(4):936-941(in Chinese)
[24]Ehleringer JR,Buchmann N,Flanagan LB.Carbon isotope ratios in belowground carbon cycle processes.Ecological Applications,2000,10:412-422
[25]Stevenson BA,Kelly EF,Mc Donald EV,et al.The stable carbon isotope composition of soil organic carbon and pedogenic carbonates along a bioclimatic gradient in the Palouse region,Washington State,USA.Geoderma,2005,124:37-47
[26]Ci E(慈恩),Yang L-Z(杨林章),Ma L(马力),et al.Distribution and stable carbon isotope character of organic carbon of paddy soils with long-term cultivation.Journal of Soil and Water Conservation(水土保持学报),2007,21(5):72-75,179(in Chinese)
[27]Liang LL,Riveros-Iregui DA,Risk DA.Spatial and seasonal variabilities of the stable carbon isotope composition of soil CO2concentration and flux in complex terrain.Journal of Geophysical Research:Biogeosciences,2016,121:2328-2339
[28]Boutton TW,Archer SR,Midwood AJ,et al.δ13C values of soil organic carbon and their use in documenting vegetation change in a subtropical savanna ecosystem.Geoderma,1998,82:5-41
[29]Sayak B,Shailesh A,Prasanta S,et al.Carbon isotopic ratios of modern C3-C4 plants from the Gangetic Plain,India and its implications to Paleo-vegetational reconstruction.Palaeogeography,Palaeoclimatology,Palaeoecology,2015,440:22-32
[30]Deines P.The isotopic composition of reduced organic carbon//Fritz P,Fontes JC,eds.Handbook of Environmental Isotope Geochemistry.1.The Terrestrial Environment.Amsterdam:Elsevier,1980:329-406
[31]Chen S-P(陈世苹),Bai Y-F(白永飞),Han X-G(韩兴国).Applications of stable carbon isotope techniques to ecological research.Acta Phytoecologica Sinica(植物生态学报),2002,26(5):549-560(in Chinese)
[32]Kraimer RA,Monger HC.Carbon isotopic subsets of soil carbonate:A particle size comparison of limestone and igneous parent materials.Geoderma,2009,150:1-9
[33]Li T(李涛),Wu X(吴夏),Huang Y-M(黄艳梅),et al.Stable carbon isotopic composition and seasonal varying characteristics of karst soil and vegetation in Guilin.Journal of Southern Agriculture(南方农业学报),2013,44(6):968-973(in Chinese)
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