次生木質部發育研究的內容是有關木材生成機理。這是林業科學的重要核心內容。植物學解決了木材逐年生成的共性細胞學過程，包括樹莖頂稍初生生長至次生生長的連續轉換。但樹莖逐年次生生長中的變化卻是林學和木材科學的學術盲區。單株樹莖中的木材差異是樹木在遺傳控制下次生生長中的變化遺傳物，但迄今把它與種內株間和種間在學術上都看作變異。這一誤識充分表明，樹莖逐年次生生長中的變化是木材生成機理中的重要部分。《木質部原理·次生木質部（1）：針葉樹（英文版）》的新理念：認定單株內的木材差異是在生命過程變化中形成，并證明它受遺傳控制，由此把這一變化定性為次生木質部發育。
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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