1. In that age class should be implemented?

2. Buds composed of 5 and 6 age classes, the 2 age class was dominant, and this also showed stable structure.

3. The age class structure of Acanthopanax senticosus population was stable in the Quercus mongolica forest, but they were unstable in the theropencedrymion and secondary forest.

4. Most 1st age class rhizomes of present year developed from the 2nd age classes.

5. But stand volume descents to a great extent, age class and stand density structure are maladjusted badly, and the number of stand growth is low.

6. The 1 st age class rhizome emerges at mid of growing season.

7. The ramets of 1st age class had the biggest productive potential, while the ramet productivity of 4th age class was generally weakened at milk stage.

8. The types of vegetation and the changes of the biodiversity were studied by investigating the species diversity of rubber forest in different age class.

9. The potential clone population consist of rhizome buds of 0 age class and tillering node buds of 1 age class, of which 0 age class constitute the majority, 84.8%.

10. The SOD activity of D. involucrata leaves as affected by both biological and non-biological factors, and varied with age class, leaf position and leaf layer.

11. L. quinquenervius clonal population adopted the survival and development strategies to preferentially transport and store nutrition matter to the 1st age class rhizomes.

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12. The rhizomes of L. quinquenervius could live for 3 years at most, but the 3rd age class rhizomes were very little and lost clonal reproductive capacity until the late period of growing season.

13. With the POPGENE analysis software, the genetic diversity index was calculated and the variation of genetic diversity was analyzed in every age class level.

14. The model allows for a population with multiple sex-age classes, different number of age class between sires and dams, and varied genetic contribution of the age class.