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An Important Part of Wood Formation Mechanism-Secondary Xylem Development (1) Coniferous Tree
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An Important Part of Wood Formation Mechanism-Secondary Xylem Development (1) Coniferous Tree
木质部原理-次生木质部(1) 针叶树
Language:  English
Author:  Yin Sici
Pub. Date:  2013-09 Weight:  1.4 kg ISBN:  9787030376640
Format:  Hardcover Pages:  670
Subject:  Technology > Forestry > Wood Science
Series:   Size:  258x194mm
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    The distribution of sampling positions in a sample tree depends on satisfying that the result of continuous development with the combinations of two directional growth ages of the entire wood sample could be got by regression analysis, which just meet the requirement of study that is secondary xylem development with time.
    The measured accuracy of developmental trait must higher than the extent of trait differences that are exhibited (shown) between two successive measurements, which could barely reflect the change of developmental trait.
    1.2.7 The effects of mathematical means and computerization
In general development research, the consecutive trait values are measured on a series of designed / selected times. A planar curve could be drawn, its abscissa is time and its ordinate is trait value. The diagram shows that the trait changes continuously with time. At present, this work could be fulfilled by computers, curve can be drawn and its equation is given at the same time. However, the time of secondary xylem development is two directional growth ages, the diagram of development with time is three-dimensional curved surface. It is not suitable for secondary xylem development research directly; the expression shown by three-dimensional curved surface could be substituted by planar curve group of its different sectional views. What are those planar curves?
The diagram of developmental change of secondary xylem with two directional growth ages is three-dimensional curved surface. That is substituted for the planar curve group of four types in this project, which are directly drawn from measured data. This treatment corresponds with mathematical principle. They are all the sectional views of the curved surface on different specific conditions. The developmental change expressed on the curved surface could be fully observed by those planar curve groups.
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