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Data Requirements For Developing Growth Models For Tropical Moist Forests, Jerome K. Vanclay

Professor Jerome K Vanclay

Permanent sample plots provide the basis for growth modelling, yield prediction and sustained yield management, and the reliability of the data is crucial to these and many other aspects of forest management. To obtain reliable data, it is necessary to ensure consistent standards and that a wide range of stand and site conditions are sampled using both passive monitoring and experimental plots. Individual trees should be numbered, marked and mapped. Remeasurement frequency should be determined to facilitate plot relocation and ensure that growth is greater than measurement errors. Measurement records should be unambiguous and secure.

Lessons From The Queensland Rainforests: Steps Towards Sustainability, Jerome K. Vanclay

Professor Jerome K Vanclay

Commercial timber harvesting commenced in the tropical rainforests of north Queensland in 1873 and ceased in 1988 following their inclusion on the World Heritage List. The evolution of forest policy, management and research is reviewed, and strengths and weaknesses are highlighted. Between 1950-85, eight estimates of the sustainable yield varied ten-fold. Discrepancies were due to different assumptions regarding management, and to errors in estimating net productive areas and growth rates. During 1950-85, the allowable cut (130,000-207,000 m3/ann) exceeded sustained yield estimates (60,000-180,000 m3/ann), but the actual harvest (90,000-205,000 m3/ann) remained less than the allowable cut. The allowable cut was reduced …

Sustainable Harvesting Of Tropical Rainforests: Reply To Keto, Scott And Olsen, Jerome K. Vanclay, E J. Rudder, Glenn Dale, G A. Blake

Professor Jerome K Vanclay

This paper refutes the Keto et al. proposition that the Queensland selection logging system is neither ecologically nor economically sustainable. The key requirements of this system are: (1) that logging guidelines are sympathetic to the silvicultural characteristics of the forest, ensuring adequate regeneration of commercial species and discouraging invasion by weeds; (2) tree-marking by trained staff specifies trees to be retained, trees to be removed and the direction of felling to ensure minimal damage to the residual stand; (3) logging equipment is appropriate and driven by trained operators to ensure minimal damage and soil disturbance, compaction and erosion; (4) prescriptions …

Modelling Forest Growth And Yield : Applications To Mixed Tropical Forests, Jerome K. Vanclay

Professor Jerome K Vanclay

Contents: 1. Introduction -- 2. Whole Stand Models -- 3. Size Class Models -- 4. Single-tree and Tree List Models -- 5. Data Requirements -- 6. Constructing Growth Models -- 7. Forest Site Evaluation -- 8. Diameter Increment -- 9. Mortality and Merchantability -- 10. Regeneration and Recruitment -- 11. Model Evaluation and Re-calibration -- 12. Implementation and Use -- 13. Future Directions.

Potential Contributions Of Statistics And Modelling To Sustainable Forest Managment: Review And Synthesis, Keith Rennolls, Margarida Tomé, Ronald E. Mcroberts, Jerome K. Vanclay, Valerie Lemay, Biing T. Guan, George Z. Gertner

Professor Jerome K Vanclay

This chapter provides a review of the statistical and modelling disciplines, their techniques and potential contribution to sustainable forest management (SFM). The main topics covered are:

Mensuration and models for sustainable forest management (SFM) Inventory and monitoring for forest sustainability: criteria and indicators Models of tropical forests for the conservation of biodiversity Integrating information and models across spatial and temporal scales for SFM Climate and carbon models in relation to sustainability New techniques for the statistical analysis of sustainability data Uncertainly analysis in modeling and monitoring for SFM Forest data, information and model archives

There are major contributions to be …