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Module Growth And Biomass Allocation Of Chloris Virgata Clone At Two Different Habitat Types In Songnen Plain Of China

Posted on:2019-06-26Degree:MasterType:Thesis
Country:ChinaCandidate:X TianFull Text:PDF
GTID:2370330563953675Subject:Population ecology
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Chloris virgata clones in alkali and sandy habitats were studied in the Songnen plain.Large sample sampling was carried out at seedling stage,elongation stage,booting stage,blooming period and full ripening period in two consecutive years.We conducted a comparative analysis of growth characteristics,production and distribution characteristics in both ramet module and root module between different habitats and different years.The correlation analysis and regularity simulation of quantitative characters in clone modules were also conducted.The main findings are as follows:(1)There were significant differences in ramet size,quantitative characteristics and production characteristics between the two different habitats and different years during the five growth stages.It indicated that the growth and production of the clonal ramets have more phenotypic plasticity.In the early growth stage,the tuft size was significantly higher in sandy habitat than that in alkaline habitat.At booting stage,it was 19.1 cm±8.3 cm and 14.7 cm±3.8 cm.However,in the later growth stage,the tuft size was significantly higher in alkaline habitat than that in sandy habitat.At blooming period,it was 28.35 cm±13.35 cm and 21.3 cm±13.6 cm.Height and numbers of ramet and aboveground biomass in sandy habitats were higher than these in alkaline habitats in each growth stage,and most of them reached a significant level.The results showed that the growth of C.virgata is a more suitable trend after blooming period.Moreover,the sandy habitat is more suitable for the growth and production of the clone.(2)In the two habitats,the depth of root and the angel of root in the sandy habitat was significantly higher than that in the alkaline habitat in each growth stage.At full ripening period,the depth of root was 35°±15°in the alkalinity habitat and was 68.5°±15.5°in the sandy habitat.That indicated that the root architecture of C.virgata clone has greater phenotypic plasticity not only in the habitat but also between the habitats.In addition,the root adopted different extension methods that alkaline habitat earth extended horizontally to the surrounding.While in the sandy habitat,it vertically extended mainly to the below.(3)There were significant positive correlations between the quantitative characters and tuft size,quantitative characters of the root component and the total biomass at all growth stages in the two habitats and years.And most of them were linear functions which showed isometric growth.This indicated that there was a certain regularity between the root module growth and the ramet size.At the same time,the total biomass was not only affected by the quantitative characters of ramets,but also restricted by the quantitative characters of the root modules.(4)The reproductive allocation and aboveground biomass allocation of C.virgata clone increased with the increase of the total biomass.However,the belowground biomass allocation decreased with the growth of the total biomass.It indicates that the root modules of C.virgata mainly grow,expand,and occupy more resources at the early of growth stages,which can ensure the growth of the belowground parts.At the later growth stage,the clones allocate more energy to the aboveground parts,especially to t reproduction parts,to meet its own growth and reproduction,so as to maintain the population recruitments.
Keywords/Search Tags:Habitat, Chloris virgata, Clone, Growth stage, Growth, Biomass allocation
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