δ~(13)C值在羊草草原植物体中的差异和变化及其影响因素分析
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摘要
为了解稳定同位素~(13)C在草原植物体中的分配和变化以及水分和温度对~(13)C组成(δ~(13)C)的影响,在内蒙古羊草草原的生长盛期(7-9月),应用~(13)C脉冲标记技术,测定了~(13)C脉冲标记处理和对照处理下羊草草原植物活体和活根中的δ~(13)C,分析了土壤水分、气温和地温对植物体中δ~(13)C的影响。结果表明:对照处理中羊草草原植物活根δ~(13)C值比活体高1～2‰,标记处理中活体δ~(13)C值显著高于活根,标记处理中活体和活根的δ~(13)C均显著高于对照处理。生长盛期,标记和对照处理中植物活体和活根的δ~(13)C值均表现为先减小再增加,随后再减小的趋势。对照处理中活体和活根以及标记处理中活根的δ~(13)C与0～20cm土壤水分含量之间线性负相关,而标记处理中活体δ~(13)C与0～20cm土壤水分之间存在二次函数关系。标记、对照两处理中羊草草原活体、活根δ~(13)C与温度均呈线性正相关。
In order to understand the distribution and change of stable carbon isotope ~(13)C in grassland plants and the effects of soil moisture and temperature on the stable carbon isotope ~(13)C composition( δ~(13)C),we measured the δ~(13)C of shoots and living roots which both had two treatments,~(13)C pulse labeling treatment and control treatment,and analyzed the effect of soil moisture content,air temperature and ground temperature on the δ~(13)C of plants body during the fast-growing stage(July-September)of the Leymus chinensis grassland in Inner Mongolia.The results showed that the δ~(13)C of the living roots was 1～2‰ higher than the δ~(13)C of the shoots in control treatments,and the δ~(13)C of the shoots in~(13)C pulse labeling treatment was significantly greater than the δ~(13)C of the living roots.The variation trends of the δ~(13)C value of shoots and living roots in labeling and control treatments were both in good consistency with time,which showed that the value of~(13)C in shoots and living roots decreased at first,then increased,and then decreased during the growing season of plants.The δ~(13)C of the shoots and living roots in control group and living roots in ~(13)C pulse labeling treatment had a linear negative correlation with soil moisture content in the layer of 0～20 cm,but the δ~(13)C of shoots in ~(13)C pulse labeling treatment had Quadratic function relation with the soil moisture content in the layer of 0～20 cm,which indicated that the δ~(13)C increased with increasing soil moisture content when it had a low soil moisture content,and the δ~(13)C decreased when there was a high soil moisture content.In~(13)C pulse labeling treatment and control treatment,there were significant positive correlation between temperature and the δ~(13)C of the shoots and living roots,the δ~(13)C of the shoots and living roots increased with increasing the temperature.
In order to understand the distribution and change of stable carbon isotope ~(13)C in grassland plants and the effects of soil moisture and temperature on the stable carbon isotope ~(13)C composition( δ~(13)C),we measured the δ~(13)C of shoots and living roots which both had two treatments,~(13)C pulse labeling treatment and control treatment,and analyzed the effect of soil moisture content,air temperature and ground temperature on the δ~(13)C of plants body during the fast-growing stage(July-September)of the Leymus chinensis grassland in Inner Mongolia.The results showed that the δ~(13)C of the living roots was 1～2‰ higher than the δ~(13)C of the shoots in control treatments,and the δ~(13)C of the shoots in~(13)C pulse labeling treatment was significantly greater than the δ~(13)C of the living roots.The variation trends of the δ~(13)C value of shoots and living roots in labeling and control treatments were both in good consistency with time,which showed that the value of~(13)C in shoots and living roots decreased at first,then increased,and then decreased during the growing season of plants.The δ~(13)C of the shoots and living roots in control group and living roots in ~(13)C pulse labeling treatment had a linear negative correlation with soil moisture content in the layer of 0～20 cm,but the δ~(13)C of shoots in ~(13)C pulse labeling treatment had Quadratic function relation with the soil moisture content in the layer of 0～20 cm,which indicated that the δ~(13)C increased with increasing soil moisture content when it had a low soil moisture content,and the δ~(13)C decreased when there was a high soil moisture content.In~(13)C pulse labeling treatment and control treatment,there were significant positive correlation between temperature and the δ~(13)C of the shoots and living roots,the δ~(13)C of the shoots and living roots increased with increasing the temperature.
引文
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[12]张蕊,赵钰,何红波,等.基于稳定碳同位素技术研究大气co2浓度升高对植物-土壤系统碳循环的影响[J].应用生态学报,2017,28(7):2379-2388
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[14]何树斌,王燚,程宇阳,等.丛枝菌根真菌与柳枝稷协同固碳机制及对土壤碳氮循环的调控[J].草地学报,2016,24(04):802-806
[15]王喜明,王媛,马丽娜,等.碳、氮同位素技术在我国草地植物营养研究中的应用[J].中国草地学报,2014,36(1):104-108
[16]Bruggemann N,Gessler A,Kayler Z,et al.Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum:A review[J].Biogeosciences,2011,8(11):3457-3489
[17]Creamer C A,Filley T R,Boutton T W,et al.Controls on soil carbon accumulation during woody plant encroachment:Evidence from physical fractionation,soil respiration,andδ13c of respired co2[J].Soil Biology&Biochemistry,2011,43(8):1678-1687
[18]Zou J,Zhao L,Xu S,et al.Field13co2pulse labeling reveals differential partitioning patterns of photoassimilated carbon in response to livestock exclosure in a kobresia meadow[J].Biogeosciences,2014,11:4381-4391
[19]Resco V,Ferrio J P,Carreira J A,et al.The stable isotope ecology of terrestrial plant succession[J].2011,4(2-3):117-130
[20]Tucker C L,Young J M,Williams D G,et al.Process-based isotope partitioning of winter soil respiration in a subalpine ecosystem reveals importance of rhizospheric respiration[J].Biogeochemistry,2014,121(2):389-408
[21]宋文琛,同小娟,张劲松,等.用自然13 C丰度法区分人工林根源呼吸的原理与应用[J].中国水土保持科学,2015,13(4):37-43
[22]Riederer M,Pausch J,Kuzyakov Y,et al.Partitioning nee for absolute c input into various ecosystem pools by combining results from eddy-covariance,atmospheric flux partitioning and13co2pulse labeling[J].Plant and Soil,2015,390(1-2):61-76
[23]Zhang J M,Griffis T J,Baker J M.Using continuous stable isotope measurements to partition net ecosystem co 2exchange[J].Plant Cell&Environment,2006,29(4):483-496
[24]Still C J,Berry J A,Collatz G J,et al.Global distribution of C3and C4vegetation:Carbon cycle implications[J].Global Biogeochemical Cycles,2003,17(1):1006
[25]O'leary M H.Carbon isotopes in photosynthesis[J].Bioscience,1988,38(5):328-336
[26]Coleman D C,Fry B.Carbon isotope techniques[M].San Diego:Academic Press,1991
[27]Kuzyakov Y.Sources of co2efflux from soil and review of partitioning methods[J].Soil Biology&Biochemistry,2006,38:425-448
[28]Craig H.The geochemistry of the stable carbon isotopes[J].Geochimica et Cosmochimica Acta,1953,3(2):53-92
[29]Badeck F W,Tcherkez G,Nogués S,et al.Post-photosynthetic fractionation of stable carbon isotopes between plant organs--a widespread phenomenon[J].Rapid Communications in Mass Spectrometry,2005,19(11):1381-1391
[30]Wu Y B,Tan H C,Deng Y C,et al.Partitioning pattern of carbon flux in a kobresia grassland on the qinghai-tibetan plateau revealed by field 13cpulse-labeling[J].Global Change Biology,2010,16(8):2322-2333
[31]刘贤赵,宿庆,李嘉竹,等.控温条件下c3、c4草本植物碳同位素组成对温度的响应[J].生态学报,2015,35(10):3278-3287
[32]殷树鹏,张成君,郭方琴,等.植物碳同位素组成的环境影响因素及在水分利用效率中的应用_殷树鹏[J].同位素,2008,21(1):46-52
[33]Zhou Y C,Fan J W,Zhong H P,et al.Relationships between altitudinal gradient and plant carbon isotope composition of grassland communities on the qinghai-tibet plateau,china[J].SCIENCE CHINA(Earth Sciences),2013,56(2):311-320
[34]赵艳艳,徐隆华,姚步青,等.模拟增温对高寒草甸植物叶片碳氮及其同位素δ13c和δ15 n含量的影响[J].西北植物学报,2016,36(4):777-783
[35]刘艳杰,许宁,牛海山.内蒙古草原常见植物叶片δ13c和δ15n对环境因子的响应[J].生态学报,2016,36(1):235-243
[36]严昌荣,韩兴国.六种木本植物水分利用效率和其小生境关系研究[J].生态学报,2001,21(11):1952-1956
[37]Swap R J,Aranibar J N,Dowty P R,et al.Natural abundance of13C and15 n in C3and C4vegetation of southern africa:Patterns and implications[J].Global Change Biology,2004,10(3):350-358
[38]Hartman G,Danin A.Isotopic values of plants in relation to water availability in the eastern mediterranean region[J].Oecologia,2010,162(4):837-52
[39]齐玉春,董云社,耿元波,等.我国草地生态系统碳循环研究进展[J].地理科学进展,2003,22(4):342-352
[40]Li S G,Asanuma J,Eugster W,et al.Net ecosystem carbon dioxide exchange over grazed steppe in central mongolia[J].Global Change Biology,2005,11(11):1941-1955
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