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The Correlativity between Site Condition and Properties of Alnus Formosana Introduced by Sichuan

Author: YangYongQian
Tutor: LuoChengDe
School: Sichuan Agricultural University
Course: Forest cultivation
Keywords: Alnus formosana Site condition Wood properties Correlativity
CLC: S781
Type: Master's thesis
Year: 2009
Downloads: 56
Quote: 0
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Abstract


Three six-year Alnus formosana collected in four growing points respectively from Leshan and Guangyuan city Sichuan province were tested as sample timbers, meteorological data in recent five years and soil samples were also collected; physical and mechanical properties, stem parse and chemical analysis of soil samples were texted in this paper; meteorological and soil of environment factors as independent variables, while mechanical properties as dependent variable, processing dates using variance analysis combine with canonical correlation analysis, coming to the conclusion of the major correlation factors affecting wood properties, and provided correlation scientific basis for forest cultivation and Alnus formosana introduced to Sichuan. The research results showed:(1)The distinction of gross and minute structure of Alnus formosana collecting in Leshan and Guangyuan isn’t significant.(2)The results of stem parse indicated the average diameter at breast height and height increment of Alnus formosana grew with thicker richer soil, soil layer and soil keeping water well are bigger; while worse with opposite condition.(3)In terms of fiber configuration, spring and summer wood fiber of Alnus formosana collected in dazaizi mountain, suji town, Leshan city have the largest ratio of fiber length and diameter at breast height (58/75), while it’s the least collected in ecologically friendly park, suji town, Leshan city (48/63)(4)The average air-dry density of Alnus formosana in introduced place (0.47g/cm3) is less than that in Taiwan local (0.52g/cm3), and it is nearly same in the introduced place with poor site condition and Taiwan local, for example, three-bao village Guangyuan city (0.52g/cm3).(5) Variance analysis and t-test of mechanical properties of Alnus formosana collected in Guangyuan and LeshanThe results of physical properties of Alnus formosana using variance analysis are the following:the difference of water absorption of Alnus formosana collected in Guangyuan and Leshan is highly significant; the difference of air-dry bulk shrinkage, oven-dry tangential and bulk shrinkage and swelling property is significant; while the difference of basic density, air-dry density, air-dry tangential and radial shrinkage and oven-dry tangential shrinkage is relatively significant.The results of mechanical properties of Alnus formosana using variance analysis is the following:the difference of bending strength, modulus of elasticity in static bending, impact toughness and cleavage tangential is highly significant; the difference of compressive strength parallel, shearing strength and tensile strength parallel is significant.(6)The correlativity of meteorological factors and physical and mechanical properties of Alnus formosana is the following:the correlation of physical and mechanical properties and annual precipitation, daylight time, height above sea level, slope aspect, slope and forest land relief of the meteorological factors is significant.(7)The correlativity of soil factors and physical and mechanical properties of Alnus formosana is the following:the correlation of physical and mechanical properties and nitrogen, potassium, potassium of soil chemical property, soil organic matter, soil pH value and soil depth, soil keeping water, soil texture of soil mechanical properties is significant.(8) The canonical correlation coefficient of site conditions and properties of Alnus formosanaThe canonical correlation coefficient of site conditions and physical properties of Alnus formosana:λ1=0.99%,λ2=0.999,λ3=0.997,λ4=0.880, the correlation is significant.The canonical correlation coefficient of site conditions and chemical properties of Alnus formosana:λ1=0.999,λ2=0.997,λ3=0.99%,λ4=0.873, the correlation is significant.The innovation is:analyze and get the correlation coefficient of different site conditions and wood properties, and estimate the main factors affecting the vegetation of Alnus formosana exactly.

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CLC: > Agricultural Sciences > Forestry > Forest harvesting and utilization > Wood Science
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