. American forestry. Forests and forestry. RECONNAISSANCE: ITS RELATION TO FOREST PLANS 23. ALPIXE TYPK, MT. LASSKN MOUNTAIN HEMLOCK OF LITTLK COMMERCIAL IMPORTANCE. waste lands such as lava beds, and water areas. It shows the composition of the tiniberlands; in other words, what spe- cies of commercial importance are on each "forty," and also the relations that exist between the distribution of the various species and the factors of to- pography and altitude. Furthermore, it serves as a basis for applying tables which show the yield of each forest type. The timber estimate serves a
. American forestry. Forests and forestry. RECONNAISSANCE: ITS RELATION TO FOREST PLANS 23. ALPIXE TYPK, MT. LASSKN MOUNTAIN HEMLOCK OF LITTLK COMMERCIAL IMPORTANCE. waste lands such as lava beds, and water areas. It shows the composition of the tiniberlands; in other words, what spe- cies of commercial importance are on each "forty," and also the relations that exist between the distribution of the various species and the factors of to- pography and altitude. Furthermore, it serves as a basis for applying tables which show the yield of each forest type. The timber estimate serves a three- fold purpose. It gives us an inventory of our timber resources that is more ac- curate than any we have had. The esti- mate supersedes all former guesses, mountain-top estimates, and rough re- connaissance calculations; in itself it is an exact working plan estimate. Com- paring this with the best figures we have had heretofore, one gets an idea what reconnaissance estimate means. A rough reconnaissance made in 1910 for certain townships on the Lassen Na- tional Forest showed about 31G million feet of timber. An intensive reconnais- sance for the same area, made two years later, showed 808 million, or about two and one-half times as much. These fig- ures, based on the stand upon about 80,000 acres, are fairly indicative of how the total forest estimate would compare. The second purpose of the reconnais- sance estimate naturally follows from the first, for, after knowing how much we have the next question is how much can we sell? In other words, what is the sustained annual yield for the for- est? At the present time this cut is fig- ured from the best available data, namely, the "rough" reconnaissance mentioned above. The intensive recon- naissance figures would mean that we had, yearly, about two and one-half times more timber for sale than we did under the old method. While very in- teresting and important in the future, these figures are not essential at pre
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
