. Schlich's manual of forestry. rtion of thetrees are removed, and a new crop is introduced, which growsup between the trees remaining of the first crop, the two beingallowed to run through an additional whole rotation of thesecond crop. The difference between the two crops ranges, asa rule, from 20 to 60 years. Here, then, is an excellent oppor-tunity of protecting a threatened against a threatening species,the first crop consisting of the former, and the second of thelatter. In Europe, the system is much adopted for the pro-duction of large-sized oak, larch and Scotch pine, also ash,maple an
. Schlich's manual of forestry. rtion of thetrees are removed, and a new crop is introduced, which growsup between the trees remaining of the first crop, the two beingallowed to run through an additional whole rotation of thesecond crop. The difference between the two crops ranges, asa rule, from 20 to 60 years. Here, then, is an excellent oppor-tunity of protecting a threatened against a threatening species,the first crop consisting of the former, and the second of thelatter. In Europe, the system is much adopted for the pro-duction of large-sized oak, larch and Scotch pine, also ash,maple and others, which at a certain age are underplantedwith beech, silver fir, spruce, hornbeam, sweet chestnut, hazel s. t 274 FORMATION OF MIXED WOODS. or certain exotic species, such as Douglas fir, Sitka spruce,Thuia plicata, Abies grandis, Tsuga Albertiana, and underplanting had best be done in the case of larch atthe age of 15 to 30 years, of Scotch pine at 30 to 40 years,and of oak at 30 to 50 years, or even Fig. 99.—Larch underplanted with Abies grandis (Novar, Scotland). d. Mixed Copjnce with Standards. This system offers, in the regeneration of the over wood,the greatest latitude for the protection of threatened sj)ecies,whether in single trees or in groups. Although some of thestandards may regenerate themselves naturally, the greaterpart are produced by planting strong plants where maturestandards have been removed. 275 CHAPTER V. CHOICE OF METHOD OF FORMATION. The choice of method depends on numerous attempt a detailed exposition of these matters in referenceto the several methods would not lead to any practical result,since, after all, the choice depends on the local circumstancesof each case. A few remarks regarding the main groups ofmethods may, however, not he out of place. These maingroups are:— (1.) Direct sowing. (2.) Planting. (3.) Natural regeneration by seed. (4.) Natural regeneration by shoots and suckers. Of these, th
Size: 1824px × 1369px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
