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Mingzhuo Hao

Mingzhuo Hao

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Mingzhuo Hao

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  1. 2013 Western Mensurationists Meeting Simulating Small Tree Height and Diameter Growth of Catalpa bungei Mingzhuo Hao

  2. Contents • Introduction of Catalpa bungei • Research objectives • Simulation model framework • Analysis of site types • Analysis of climate zones • Testing of different Catalpa bungeiclones • Running the model • Additional questions & possible future studies

  3. Introduction • Catalpa bungei is a deciduous broad-leaf tree species in China that is of considerable importance for cultural, ornamental, and wood products purposes. • It was called “king of wood-production tree" in China • It had been cultivated more than 2000 years • North American species isCatalpa bignonioides Walt.

  4. Distribution Map of Catalpa bungei

  5. Some individual trees with high wood properties

  6. Some stands

  7. Totally left 232 old trees in China 1000 years old 1300 years old

  8. Flower and Pod

  9. Good adaptability

  10. Seedlings grow very fast

  11. High afforestation survival rate

  12. Used in urban silviculture projects

  13. Research Objectives • For my test sites, how many site types can be recognized? For each site type height and diameter growth curves for small trees are required. • Based on my data and reference literature, how many climate zonesof Catalpa bungei should be recognized in China? What's the growth difference between different zones? • Different clonesgrow differently. Comparing clones in terms of height and diameter can be used to predict future yields. • Build a simulation model for growth & yield of Catalpa bungei.

  14. Simulation model framework STELLA 3 Dimensions model

  15. Nanjing Shanghai Testing Location for Site & Clones China 10 ha14 plots

  16. Experimental stand of Catalpa bungei

  17. Analysis of site types Legend Code of site Small trees Location of soil samples N-S sectional view C A D F B E G Bird's-eye view W-E sectional view

  18. Soil properties of different site Soil water Nitrogen Kalium Soil weight Phosphor pH value

  19. Yuqiu1 Yuqiu1 7.0 6.0 Nanyang Nanyang 6.0 5.0 5.0 4.0 4.0 Height (m) DBH (cm) 3.0 3.0 2.0 2.0 1.0 1.0 0.0 0.0 A B C D E F G A B C D E F G Sites Sites Growth statusof different Site types DBH Height

  20. Site types cluster analysis Cluster Analysis: 5 types, Very good to very poor

  21. Analysis of climate zone Based on 11meteorological elements

  22. Meteorological Data collected • annual average site barometric pressure • annual average temperature • annual mean maximum temperature • annual mean minimum temperature • annual extreme maximum temperature • annual extreme minimum temperature • annual average relative humidity • annual rainfall • annual average wind speed • maximum wind speed • annual sunshine time

  23. Meteorological Data of the sites Cluster Analysis: 4 types

  24. Trend surface map of mature Catalpa bungei trees in different areas Diameter Height

  25. Growth equations of mature Catalpa bungei trees in different areas

  26. Gowth status of Catalpa bungeismall trees

  27. Gowth status of Catalpa bungeismall trees Growth curves of 7 clones of Catalpa bungei DBH Height

  28. Gowth curves of Catalpa bungeitrees Guo Congjian (1991), Henan Province Jinsiqiu

  29. Demonstration of running model

  30. Questions & Future Studies • The interplay between genetic makeup and environment • Relationships between young and mature trees • Influence of treatment & density • Smart and powerful simulation models for Catalpa bungeineed more experimental data and possibly interact with other spatial databases in a GIS environment

  31. THANKS FOR YOUR ATTENTION ! My E-mail: mingzhuohao@gmail.com Supervisor: Peter Marshall