. Adventures with animals and plants. Biology. 402 Hoiv LiviiJg Things Affect One Another unit vti. Fig. :i53 Clemi hm?bermg (left) reduces the fire hazard. Digging trenches (right) to keep a forest fire jroin spreading, (u. s. forest service) water has been lost from the hillsides. Fewer kinds of plants can grow on dry than on moist hillsides. Forest conservation. We must con- tinue to cut forest trees for necessary lumber, but we must do it in such a way that the forests will not be destroyed. We must have conservation. About sixty years ago, the United States Forest Serv- ice was establishe
. Adventures with animals and plants. Biology. 402 Hoiv LiviiJg Things Affect One Another unit vti. Fig. :i53 Clemi hm?bermg (left) reduces the fire hazard. Digging trenches (right) to keep a forest fire jroin spreading, (u. s. forest service) water has been lost from the hillsides. Fewer kinds of plants can grow on dry than on moist hillsides. Forest conservation. We must con- tinue to cut forest trees for necessary lumber, but we must do it in such a way that the forests will not be destroyed. We must have conservation. About sixty years ago, the United States Forest Serv- ice was established as part of the Depart- ment of Agriculture. Schools of forestry were opened in many parts of the coun- try; new professions, such as those of forester and forest ranger, arose in con- nection with this work. These men and the biologists who studied forests have learned many important facts. It takes a forest tree between fifty and one hun- dred years to grow to a size suitable for making into lumber. The first rule of conservation is to use only as much as will be naturally replaced. This rule may be applied as a simple arithmetic prob- lem: the man who owns 50,000 trees ready for cutting should cut no more than 1000 every year. The trees to be cut should be carefully selected. They should be the older trees which provide good lumber or large quantities of pulp and those trees should be cut that hinder most the growth of smaller trees. If it is prop- erly spaced, cutting in a forest is highly desirable, for it gives the small trees an opportunity for faster growth. You should now be able to do Exercise i. Some land now used for crops or pasture is better fitted for forest growth. In some such areas trees are being planted by the Federal government, by the State gov- ernment, or by well-informed private owners. The soil problem. The problem of soil destruction is one of the greatest that faces the people of the United States. Unfortunately, most of us do not know about it. The
Size: 2546px × 981px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
