Wang, Tiezhi

Yang, Yunfei

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Dynamics of Reproductive Allocation of Reproductive Tillers in Stipa baicalansis Populations on the Songnen Plains, China Tiezhi Wang Northeast Normal University, China Yunfei Yang Northeast Normal University, China 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/21/1-3/36 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. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]135　 瞯Grasslands/Rangelands Resources and Ecology ——— Ecology of Grasslands/RangelandsDynamics of reproductive allocation of reproductive tillers in Stipa baicalansis populations onthe Songnen Plains , ChinaW ang T ie‐z hi , Y ang Yun‐f eiK ey L aboratory o f Vegetation Ecology , M inistry o f Education , Institute o f G rassland Science , Northeast NormalUniversity , Renmin Street , 5268 , Changchun 130024 , China . E‐mail : yangy f ＠ nenu .edu .cnKey words : Stip a baicalansis , reproductive tiller , biomass , reproductive allocationIntroduction Reproductive allocation ( RA ) is the biomass ratio of reproductive organs to total biomass in all assimilativeresource of a plant individual . Individual is plastic in size due to the difference of the microenvironment . The plasticity followscertain rules and shows the regulation in grow th and allocation at the population level . Stip a baicalansis , a perennial grass , isusually the constructive or companion species of communities in meadow steppe regions in China ( Li , et al . ,２００３ ) . Theobjective was to find the rules of the relationship of RA and height , biomass of tiller in different growing stages , whichprovided scientific accumulation to further research of reproductive ecology .Materials and methods The study was conducted at the Pasture Ecology Research Station of Northeast Normal University ,Changling , Jilin province of China ( ４４°４５′N , １２３°３１′E) which has temperate sub‐humid continental monsoon climate . S .baicalansis experimental population was planted in ２００５ . Each plot had an area of ２ m × ６ m with ５ replications . Fortyreproductive tillers were sampled randomly in all plots at flowering and ripening stages , respectively . Height , tiller andinflorescence biomass were measured . The ratio of inflorescence biomass to tiller biomass was regarded as reproductiveallocation . Relationships between biomass and height of the tiller , and RA and the height , the tiller biomass were evaluatedusing regression analysis .　 　 Figure 1 Observed data and simulated curves on relationship betweentotal biomass ( TB) and height( H ) o f the tiller , RA and both heightand total biomass o f the tiller at f lowering ( FS ) and ripening (RS)stages .Results The relationship between biomass andheight of the tillers were positively linearlycorrelated ( p ＜ ０畅０１ ) at flowering and ripeningstages , but between RA and both height andbiomass of the tiller negative correlation wasobserved , and only at flowering stage betweenRA and height of the tiller the correlation wassignificant ( p ＜ ０ . ０５ ) ( Figure １ ) . Theseindicated best isometric rule of the biomass andheight of reproductive tillers . The rule ofnegative correlations on RA and height as well asbiomass was gradually weakening from floweringto ripening stage . These showed RA of thetillers in different size were all tending to theaverage value of the population with growingstages .Discussions The grow th , intraspecies andinterspecies competitions of plants shared inlimited resource , and appropriate combination ofgrow th and reproduction could form relativepredominance in evolution . Taller tillers hadgood light and more nutrition , so they wereadvantageous in competition . Positive correlationof biomass and height indicated that increasingheight was advantageous to the whole tiller , andan increasing ratio of vegetative grow th woulddecrease RA . The nearly accordant RA in ripenembodied the strategies which S . baicalansispopulation advanced fitness through regulating grow th and allocation .ReferencesLi J . D . , Yang Y .F . ,(２００３) . Analysis of structure types for plant species in Stip a baicalensis meadow steppe in the SongnenPlains of China . A cta A grestia S inica , １１ (１) : １５‐２２ .YangY . F . , Zhang B .T . ,( ２００５ ) . Module structures and the grow th pattern of Stip a baicalansis clone in Songnen Plain ofChina . Chinese Journal o f A p p lied Ecology , １６( １２) : ２３１１‐２３１５ .3 0 ~ 0.9 .~ 0.6 ..,: CG 0.3 0 ~0.6 ~ 0.3 TB=0.0297H- l.9031 r=0.77~1" ••• --· • • 80 100 120 140 80 H(cm) RA= -0.0022H + 0.5708 r=-0.343•1' • : ~ ........ 100 120 H(cm) r = -0.2724 .. •• • 140 160 160 ';' 0.9 ~ 0 '-----'-----'-----' 0 2 TB (g) 3 2 0 TB= 0.0383H- 2.3485 r=0.87~ 60 80 100 120 140 H(cm) 0.9 ~ 0.6 0.3 o~-~-~--~-~ r=-0.1353 60 80 100 120 140 H (cm) r=-0.2175 0.9 ~ 0.6 0.3 -,,t II t41 4 0 '-----''----'-'----' 0 1 2 3 TB (g) 

Dynamics of Reproductive Allocation of Reproductive Tillers in \u3cem\u3eStipa baicalansis\u3c/em\u3e Populations on the Songnen Plains, China

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Dynamics of Reproductive Allocation of Reproductive Tillers in \u3cem\u3eStipa baicalansis\u3c/em\u3e Populations on the Songnen Plains, China

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