49 



of 10-15 years, the original stand of yellow pine, 

 sugar pine, white fir and douglas fir has been convert- 

 ed into pure stands of knohcone pine. Bhow has found 

 the same condition occurring on large areas in the Mc 

 91oud Jlat Region; in California. 



B. Destruot ion of Reproduction "by Li^ht Burning 



The average annual loss of reproduction by fire 

 in California on National Forests, between the years 

 of 1908 and 1918 has been valued at 152,173.00. In 

 general, the lumbermen consider reproduction as having 

 no value, claiming that it detrimental to logging and 

 increases the fire hazard. To the forester, however, 

 reproduction is of vital importance aa the source of 

 our future timber supply. There is a particular need 

 of favoring reproduction in the timber regions of Cal- 

 ifornia for the forests are all-aged. It would be a 

 poor economy that did not protect the advance growth 

 growth in these forests so that a supply of timber will 

 be available as soon as poiMble after the now mature 

 crop has been harveated. 



On an area I^ight Burned by the Sierra Iron Com- 

 pany near Mohawk, Plumas County, California, in the 

 spring of 1912, and examined by Show three years later, 

 it was found that practically all the reproduction less 

 than 6 feet high had been killed. An examination made 

 on 5 sample plots showed that 82^ of the saplings and 

 small poles between 2-8" were also killed. 



