次生木质部发育研究的内容是有关木材生成机理。这是林业科学的重要核心内容。植物学解决了木材逐年生成的共性细胞学过程，包括树茎顶稍初生生长至次生生长的连续转换。但树茎逐年次生生长中的变化却是林学和木材科学的学术盲区。单株树茎中的木材差异是树木在遗传控制下次生生长中的变化遗传物，但迄今把它与种内株间和种间在学术上都看作变异。这一误识充分表明，树茎逐年次生生长中的变化是木材生成机理中的重要部分。《木质部原理·次生木质部（1）：针叶树（英文版）》的新理念：认定单株内的木材差异是在生命过程变化中形成，并证明它受遗传控制，由此把这一变化定性为次生木质部发育。
Content introduced in brief
Preface
Part one General outline
1 Introduction
1.1 Natural background of secondary xylem development
1.2 The source, formation and content of the ideas of developmental studies of secondary xylem
1.3 Theoretical basis of experimental measures adopted in the studies for affirming the existence of secondary xylem development
1.4 Originality of studies of secondary xylem development
2 Experimental measures, materials and data processing
2.1 Determination
2.2 Factors to make choice of experimental material
2.3 Experimental materials
2.4 Determining the formation time of sampling position in secondary xylem
2.5 Data processing
3 That developmental phenomenon exists during secondary xylem life is proved by diagram
3.1 The diagrammatic conditions and necessity of secondary xylem development
3.2 The features of development diagram of two directional growth ages of secondary xylem
3.3 The technical terms related to ordinal numbers offing positions in secondary xylem
3.4 Explanation of four types of figures in this book
3.5 The general explanation of appendant tables
3.6 Data in appendant tables were applied to drawing figures
Part two Effect of relative disciplines and progress obtained in their application
4 The views related to development concept in biology and progress obtained in their application
4.1 Review on development concept in biology （Ⅰ） The features related to development
4.2 Review on development concept in biology （Ⅱ） The philosophical concept of developmental dynamics
4.3 Review on development concept in biology （Ⅲ） Some biological doubts relative to development
4.4 Consultation about developmental concept
4.5 Common nature of organisms' development
4.6 Secondary xylem meets the requirements for the experimental material of the study on determining the commonness of organism's development Cited Literature
5 The effect of botany and its progress obtained in application
5.1 Tree development
5.2 Expansion of comprehension about tree development
5.3 Theoretical progress in tree growth obtained in this project
5.4 The differences between the study of botany on tree growth and this project on secondar xylem development
6 The effect of wood and forest science and their progress obtained in application.
6.1 Secondary xylem is unchanged relic fixed throughout change process
6.2 Growth sheath
6.3 Two directional growth ages
6.4 Trait, time and position in developmental change of secondary xylem
6.5 Discrimination of technical terms in this chapter
6.6 Progress of wood and forest science in development studies of secondary xylem
7 The effect of genetics and its progress obtained in application
7.1 Cytology and genetics results that possess important effects on development studies of secondary xylem（Ⅰ） Genetic material
7.2 Cytology and genetics results that possess important effects on development studies of secondary xylem（Ⅱ） replication and recombination of genetic material
7.3 Genetics results that possess important effects on development studies of secondary xylem（Ⅲ） Genetic trait, acquired character, regulation and control of developmental trait
7.4 Tree under view point of genetics
7.5 Secondary xylem under the viewpoint of genetics
7.6 Discrimination and analysis of technical terms
8 The effect of evolutionary biology and its progress obtained in application
8.1 The evolution concept that have important effects in development studies
8.2 Mutation phenomenon and evolutionary relationship of secondary xylem among tree species
8.3 Dynamics of adaptation
8.4 Tree adaptation formed in evolution
8.5 Evolution and fimctionary adaptation of secondary xylem and its component cells
8.6 Conclusion
Part three Experimental proof
9 Developmental change of tracheid morphology of secondary xylem （Ⅰ） Tracheid length
9.1 Research results of correlative disciplines about tracheid length
9.2 Cogitation upon tracheid length research in this project
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Part four General review
Addendum
Plate
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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