Dissertation > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Dendrology

The Comparative Study of Leaf Water Characteristics and Characteristics of Stem Hydraulic Conductivity in Eight Species

Author ZhangHaiMin
Tutor WangLinHe;LiuMeiZhen
School Inner Mongolia Agricultural University
Course Soil and Water Conservation and Desertification Combating
Keywords Stomatal characteristics PV curve Hydraulic structures Xylem Water transport
CLC S718.4
Type Master's thesis
Year 2010
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In this paper, the Beijing Botanical Garden introduction and cultivation of plant Metasequoia ( Metasequoia glyptostroboides H. ) , ginkgo ( Ginkgo biloba L. ) , cedar ( Cedrus deodara G. ) , Chinese white poplar (Populus tomentosa C.), home elm (Ulmus pumila L.) , the Ulmus macrocarpa (Ulums macrocarpa H.), weeping willow (Salix babylonica L.) and wisteria (Wisteria sinensis S.) study by the PV curve , hydraulic conductivity and anatomy eight kinds of plant leaf water parameters , stomatal characteristics and the characteristics of stem hydraulic conductivity and xylem anatomical structures were analyzed . The results show that : 1 leaf water parameters obtained from the PV curve different months of the same species, moisture characteristics have obvious differences . The variation of the different types of plant species is inconsistent , with trees of adaptability to the environmental conditions ( light , moisture , temperature , etc.) and the hysteresis . The ψs and ψw gymnosperms in the fast-growing period ( July -September) the higher saturated osmotic potential (ψs) , and the loss of turgor point water potential (ψw) value ; xerophytic trees Populus tomentosa lower performance in the fast-growing value. Other species variation is not obvious . Mean leaf water parameters as well as various species stomata Comparative Study of the eight species divided into four different ecological types : (1) higher ψs ψw, lower stomatal density and smaller pores gymnosperms the the Metasequoia , ginkgo and cedar ; ( 2 ) lower ψs ψw, large cell elastic modulus , lower stomatal density and smaller pores xerophytic trees Populus tomentosa ; ( 3) higher ψs ψw, higher stomatal density and larger pores house elm, Ulmus macrocarpa and weeping willow ; (4) lower ψs and ψw, higher stomatal density and smaller stomata wisteria vine . 3.8 species stems guide water features significant differences gymnosperm tracheid density , but the worst water conductivity , and the vine wisteria vessel diameter showed strongest hydraulic conductivity characteristics . Xeric , xeric trees located between the two . . Species Huber value was negatively correlated with the other three hydraulic structure parameters , correspondence and coherence with its own structure and function of plants in water transport and diffusion . Catheter or tracheid diameter with maximum hydraulic conductivity , conductivity and leaf specific conductivity of positive , indicating that the larger diameter catheter is more conducive to the transmission of moisture .

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