Periodical Literature 551 



1. Thinned B degree. . 



2. Thinned C degree. . 



Pine . . 

 Beech. 



704 46.8 553.1 6.51 



Considering the diameter the indicator of value production, the 

 pine in mixture even at 120 years far outstrips the pure stands ; 

 the 242 stems of the mixed stand produce in basal area and vol- 

 ume more than the 284 stems in the severely thinned stand, be- 

 sides the product of the beech which is an additional bonus. The 

 annual increment in the mixed stand with 6.5 fm per ha excels 

 by nearly 50 per cent the considerable increment of the best 

 pure stand with 4.5 fm. 



Another 100-year-old mixed stand of pine and beech in Sax- 

 ony leads to the same results, namely, proving the advantage of 

 the mixture. Underplanting with beech should be done early, 

 in 25 to 35 years, and in old stands by natural regeneration with 

 planting of pine ; to underplant middle age classes, 40 to 80 years, 

 is not to be recommended, for the beech can then not grow to 

 value by the time the pine is harvested. 



Forsiliche Tagesfragen. Tharandter Forstliches Jahrbuch, 66 Band, 1 Heft, 

 pp. 60-93. 



The problem of how to secure the high- 

 Yield Tables est yield which a sustained yield manage- 



and ment permits, is as yet unsolved, but in 



Thinnings his yield tables of 1913 Wimmenaucr has 



shown the possibility of absolutely increas- 

 ing the yield in oak and pine by proper severe thinning and 

 underplanting practices, repeatedly taking away volume without 

 decreasing final total yield. He secured the highest yields on 

 record — the absolutely "normal" yield for the upper three site 

 classes, where underplanting can be practised. Dr. Hemman 

 cites, also, other yield tables for pine, beech, spruce, on sample 

 areas subjected to various degrees of thinning, showing the influ- 

 ence of silvicultural treatment on the yield, approaching the best 



