土壤水分胁迫对新疆大叶苜蓿构件生物量分配的影响

doi:10.13866/j.azr.2019.03.14

Abstract

Abstract: In this study,Medicago sativa cv.Xinjiangdaye was taken as the experimental material,and the pot culture experiment was adopted to reveal the change of component biomass of Medicago sativa cv.Xinjiangdaye under different soil moisture stresses (the field capacities were 85%,65% and 45% respectively).The results showed that:① Under slight water stress,the values of dry weight biomass,taproot length,branch number and leaf number of Medicago sativa cv.Xinjiangdaye were the highest;② The number,dry weight biomass,proportion and growth rate of fine roots of Medicago sativa cv.Xinjiangdaye were in an order of severe water stress>slight water stress>full water supply;③ The allocation proportion of component biomass under different soil water stresses was different.Under full water supply and slight water stress,the proportion was in an order of stem component>leaf component>root component>flower component;under the severe water stress,however,it was in an order of root component>stem component>leaf component>flower component;④ Under slight water stress,the rhizome ratio and the ratio between underground biomass and aboveground biomass were the best,and the plants adapted to the dry environment and could grow healthly.The study results could provide a scientific basis for revealing the efficient water use mechanism of crops and theoretical basis for increasing the yield of Medicago sativa cv.Xinjiangdaye in arid and semiarid regions.

Key words: Medicago sativa cv.Xinjiangdaye, soil water stress, component, biomass allocation

LIU Jia, LUO Yong-zhong, CHEN Guo-peng. Effects of Soil Moisture Stress on Biomass Allocation of Medicago sativa cv.Xinjiangdaye[J].Arid Zone Research, 2019, 36(3): 639-644.

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Effects of Soil Moisture Stress on Biomass Allocation of Medicago sativa cv.Xinjiangdaye

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