| The walnut wood samples were got in Fen yang Walnut Seed Garden of Shanxi province in two sivcultures. The walnut trees cultivated with fertilization, graft and shear measures in the first siviculture, but in the second not .The jujube wood samples were got in Wanbo forest district of Jinyuan ward,Taiyuan city, Shanxi Province. The results were as following: 1. Walnuta) The comparison of walnut wood properties in two sivculturesThe average of each property of the walnut in the first siviculture such as the maximum bending strength, modulus of elasticity in static bending, the compressive strength parallel to the grain, tangential shrinkage rate from wet to air-dry, shrinkage rate (tangential, radial, of volume) from wet to oven-dry is smaller than that in the second one, but the average of shrinkage rate (radial, of volume) from wet to air-dry, air- dry density, basic density is bigger. All the mechanical strength properties are medium or low in terms of the wood physic-mechanical classifying criteria. Regressive analysis shows that each physic-mechanical property positively related to density and the mechanical properties positively related to each other.The average value of such properties as each fiber formal feature except lumen, micro- fibril angle, ray height, and the tissue proportion (vessel, ray, axial parenchyma) of the walnut in the second siviculture is bigger than that in the first one, but the tissue proportion of fiber, raywidth, basic density is smaller.b) The radial variation laws of walnut wood properties in two sivculturesThe fiber length, length-diameter ratio, width, wall thickness, ray height and width possess the similar radial variation pattern: increase moderately firstly, then fluctuate from pith to bark, the radial variation pattern of the fiber length follows Panshinllor Panshinlll, and fiber length(y) could be predicted by the model: y=a+b Ln(x).From the pith to the bark, the proportion of fiber decreases moderately firstly, then increase, and after the ninth growth -ring fluctuate, but vessel and ray proportion follow an opposite pattern. Axial parenchyma varies randomly from pith to bark in two sivicultures.Microfibril angle varies a little from pith to bark in two sivicultures.Growth - ring width increases moderately firstly, then decreases, and then varies a little from pith to bark.c) The axial variation laws of walnut wood properties in two sivculturesIn the siviculture with fertilization, graft and shear measures, fiber proportion of the walnut wood declines from stump to the top, and differs significantly on 0.05 level among different stem-heights. All the other properties vary a little among different stem-heights.In the siviculture without such measures, the fiber wall thickness, fiber wall-lumen ratio possess the similar axial variation pattern, decrease first, then increase from the bottom to the top; basic density increase first, then decrease from the bottom to the top. The analysis of variance shows that the fiber wall thickness, fiber wall-lumen ratio, basic density differ significantly on 0.05 level among different heights, and all the other r properties do not differ significantly among different heights.d) Regressive analysis shows that it is feasible to cultivate fruitful,fine-wood, fast-growth walnut artificial plantation with fertilization, graft and shear measures. 2. Jujubea) The physic-mechanical properties of jujube Regressive analysis shows that each physic-mechanical property positively related to density and the mechanical properties positively related to each other. The maximum bending strength, the compressive strength parallel to the grain, tangential shrinkage rate from wet to air-dry are high, and modulus of elasticity in static bending, radial shrinkage rate from wet to air-dry, shrinkage rate (tangential, radial) from wet to oven-dry are medium in terms of the wood physic-mechanical classifying criteria.b) The radial variation laws of jujube wood propertiesThe radial variation p... |
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