Canadian Forestry Journal, November, 1919 



469 



THE SAMPLE PLOTS AT PET AW AW A 



The Dominion Forestry Branch has, during 

 the past season continued the investigative work 

 at the Forest Experiment Station on the military 

 reservation at Petawawa, Ontario. A number 

 of permanent sample plots have been estab- 

 lished, mapped, and described, and much in- 

 teresting and useful information in regard to 

 growth, yield, stem-form, and habits of certain 

 species under various conditions, has been col- 

 lected. Some plots have been thinned for ex- 

 perimental purposes. The trees on the plots 

 are carefully measured, numbered, and classi- 

 fied according to crown-class, and the position 

 they occupy in the stand. The exact location 

 of the remaining trees, as well as of the ones 

 thinned out, is shown on a map. It is the in- 

 tention to study through repeated measurements 

 and observations, at intervals of three to five 

 years, the future development of the trees on 

 the plots. Plots have also been laid out on 

 logged-over areas with the object of studying 

 reproduction. 



The Petawawa military reservation is an ex- 

 cellect site for silvical and silvicultural investi- 

 gations and experiments, especially with refer- 

 ence to young forest. It contains within its 

 limits many forest types, permanent and tem- 

 porary, that are representative of large sections 

 of Ontario and Quebec, which have been logged 

 over from thirty to fifty years ago, and which 

 have had their usual share of repeated fires. 



A thorough study of the habits of the dif- 

 ferent species, under various conditions; of the 

 mutual relation of soils and plant life; of re- 

 production; of growth and yield, etc., com- 

 bined with experiments with different silvi- 

 cultural methods of planting, thinning, cutting, 

 etc., on this area will, no doubt, in time, result 

 in much knowledge being obtamed which will 

 be of great benefit to lumbermen and owners of 

 forest land in general. 



The investigations at Petawawa were carried 

 on under the supervision of Mr. H. Claughton- 

 Wallin, assisted by Forest Assistant (Flight- 

 Lieut.) D. A. Macdonald, Captain A. Bentley, 

 M.C. (University of Toronto). Mr. H. Horton 

 (University of Toronto), Mr. John Irwin (Uni- 



versity of Toronto), Mr. E. T. Jenkins, R.S. 

 (University of Toronto), and one or two local 

 returned soldiers. 



Mr. N. Chrystal spent some time with the 

 party on behalf of the Dominion Entomolog- 

 ical Branch, and Mr. Wallin also reports very 

 pleasant visits being received from Mr. Arthur 

 Graham, chief fire inspector, Ottawa River 

 Forest Protective Association, and Mr. A. H. D. 

 Ross, formerly of the staff of the Faculty of 

 Forestry, University of Toronto. 



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