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Secondary xylem is the wood part of stem, root and branch of a tree excluding the primary xylem and their pith.
This book gives detailed descriptions that the secondary xylem keeps its elaborative process, but the main body
of the wood part of a standing living tree vitality in is non-living biomaterial.

It is firstly realized by this project that the static wood differences within an individual tree can serve
as an experimental material to study the dynamic change during the elaborative process. That is the

crossing between life science and material science. Hence, this project has broken through the long-term

academic limit related to wood formation in botany and wood science within the range of cell division, maturation,

and deposition process of the substances of cell walls. The life nature and the changeable state of

secondary xylem during its lasting elaboration have been an academic blank. This is an

important but unknown part of wood formation mechanism. This book is the original research

findings of the basic theory about secondary xylem development.  Growth sheath and the independence of two directional growths are defined and paid

attention for the first time as two characters of a tree's growth in this project. On the basis of the facts of secondary xylem development and the needs for the study on it,

some new concepts and measurements adopted in this project are as follows: two directional ages and their combination, special requirement for the sampling positions within a sample tree and the necessary types of the diagram that correspond with the mathematical principles. It is testified by the experimental results of the lasting life change determined from non-living wood material that the change during the secondary xylem elaboration is under geneti control, and it is theoretically ascertained that the nature of the change is development. 

 

 

This book (II) about angiospermous trees is a continuation of the book(I) Coniferous

Tree . The main point of the study on coniferous trees is that the existence of the natural 

phenomenon of the developmental changes in secondary xylem is testified by the dynamic change

similarities among trees within a

species The study on angiospermous trees is based on the foundation obtained from the previo

work on the coniferous trees and has expanded the tree species for experiments. The measures

for the experiments correspond with the structural features of angiospermous themselves. The

regularity of orderly transition of the change within a sample tree was observed, and the

twelve angiospermous species in three different wood structure types(diffuse-porous, semi-

ring-porous and ring-porous)were determined. These species were sampled in plantation in

the south of China, where the angiospermous species are prevalent. The common researching

results of angiospermous and coniferous trees are that the existence of the regular changes

during their secondary xylem elaboration can all be observed. But the analogous nature of the

changes among different tree species is different from the nature of the similarity among

different individuals within a tree species. And further, the analogous degree of the changes

 

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