Auerswald, Karl

Bai, Chunhua

Bai, Yongfei

Schnyder, Hans

Tungalag, R.

Wittmer, M.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Influence of Aridity on Carbon Isotope Discrimination in Leaves of Stipa and Other C3 Species in Central Asian Grassland M. Wittmer Technische Universität München, Germany Karl Auerswald Technische Universität München, Germany R. Tungalag National University of Mongolia, Mongolia Chunhua Bai Chinese Academy of Sciences, China Yongfei Bai Chinese Academy of Sciences, China See next page for additional authors Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/1-3/43 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. Presenter Information M. Wittmer, Karl Auerswald, R. Tungalag, Chunhua Bai, Yongfei Bai, and Hans Schnyder This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/1-3/43 瞯 ]142　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsInfluence of aridity on carbon isotope discrimination in leaves of Stipa and other C3 species incentral Asian grasslandM . W ittmer１ ,K . A uersw ald１ ,R .Tungalag２ ,Chunhua Bai３ ,Yong f ei Bai３ , H . Schnyder１１ Technische Universit t M nchen , Lehrstuhl f r G r nlandlehre , Am Hochanger １ ,D‐85350 Freising‐Weihenstephan . E‐mail :auersw ald＠ w zw . tum . de . ２ National University o f Mongolia , Ikh surguulin gudalm j — １ , Baga toiruu , Sukhbataardistrict , Ulaanbaatar , Mongolia .３ Institute o f Botany , Chinese A cademy o f Sciences 20 Nanx incun , X iangshan 10009 ,Bei j ing , China .Key words : carbon isotope discrimination , Stip a , C３ plants , aridity , central Asian grasslandIntroduction The carbon isotope discrimination ( Δ ) of C３ ecosystems is sensitive to water availability . Mean annualprecipitation ( MAP) is the most convenient and in some cases even the only known property to quantify water availability . Thestudy reports the effects of MAP on Δ of Stipa species and other C３ plants .Material and methods Stipa species and were sampled along aridity transects in Inner Mongolia ( China) and in the Republic ofMongolia in ２００５ and ２００６ . Δ of Stipa was compared with published data of Stipa and of other C３ species ( including samplescollected along the ２００５ and ２００６ transects and published data) covering several years and regions around Mongolia . Weatherdata were taken from Climate Source Inc . and the NOAA NNDC network and geostatistically interpolated to obtain temporallyand spatially resolved information for the sampling sites .Results and discussion In ２００５ and in ２００６ Δ for Stip a species increased linearly with MAP . The slope ( Figure １ a) was thesame in both years there was an offset of １ .１ ‰ . The latter was caused by a difference of about ０ .７ mm day‐１ of precipitationduring the growing season . The Δ response was the same in both years when Δ was related to the year‐specific mean dailyprecipitation during the growing season ( Figure １ b) . An unbiased generalized relation of Δ with MAP was derived for Stip aspecies in Central Asian grassland . It has a slope of ０ .００６３ ‰ mm‐１ and predicts Δ for average growing seasons . The effect onΔ of deviations of actual from mean precipitation can be accounted for . The generalized relation of Δ with MAP was validatedwith published Stip a data ( Figure ２ a) . The same relationship held true for other C３ species ( Figure ２ b) .Conclusions The relationships established in this study can be used to estimate the mean Δ of C３ communities from MAP orannual precipitation during the growing period and v ice versa .Figure 1 (a) Relation between Δ and MA P f or Stipaspecies f or the years 2005 ( ● , dashed regressionline) and 2006 ( □ , solid regression line ) . ( b )Relation between Δ o f Stipa sp . and year‐speci f icmean daily p recip itation during the grow ing period(A p ril — A ugust) f or the years 2005 ( ● ) and 2006( □ ) .　 　 　Figure 2 Relation between Δ and mean dailyp recip itation ( a) Stipa sp . f rom this study and f romliterature . ( b ) C3 species f rom this study and f romliterature .Bold lines denote 95％ con f idence interv al o f theindiv idual v alues , dashed lines 95％ con f idenceinterv al o f the regression and thin line the regression ,all calculated f rom Stipa collected in 2005 and 2006 .ReferenceNOAA NNDC Climate Data Online (２００６) . http : / / cdo .ncdc .noaa .gov /CDO/cdo .22 ------------ ------------20 18 16 2006: 15.5+ 0.0105 ,:: r2 =0.296 a □ ~ ~--------. . ---  • 2005: 14.4 + 0.0100 - 1l r2 =0.385 \6.2 + 1.283 · X r2=0.320 b 14100L_ _ l5L0 ___ 2L00 ___ 2~50 __ _J300.L__---C0L.5,----~--~1L.5,----~2 mean annual precipitation (mm yr·1) precipitation (mm day·1) 22 .6. ~ sp.(literature) c C3 (literature) ■ C3 (own) 20 l 1s <l 16 b 14 O 0 precipitation (mm day·1) 

Influence of Aridity on Carbon Isotope Discrimination in Leaves of Stipa and Other C3 Species in Central Asian Grassland

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Influence of Aridity on Carbon Isotope Discrimination in Leaves of Stipa and Other C3 Species in Central Asian Grassland

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