Forest physiography; physiography of the United States and principles of soils in relation to forestry . nce of lakes and swamps (p. 565).The spruces and the gray pine grow on the uplands between lakes andswamps; poplar, dwarf birch, willow, and alder occupy the cold wet bot-tom lands. While the trees attain fair size on the southern portions ofthe belt in which they occur, they are never large, and decrease notablyin size toward the north, where they finally become so stunted as to beof little economic importance. Southward from the broad transcontinental forest belt are an Atlan-tic forest,
Forest physiography; physiography of the United States and principles of soils in relation to forestry . nce of lakes and swamps (p. 565).The spruces and the gray pine grow on the uplands between lakes andswamps; poplar, dwarf birch, willow, and alder occupy the cold wet bot-tom lands. While the trees attain fair size on the southern portions ofthe belt in which they occur, they are never large, and decrease notablyin size toward the north, where they finally become so stunted as to beof little economic importance. Southward from the broad transcontinental forest belt are an Atlan-tic forest, a Pacific forest, and a Rocky Mountain forest. The twointervening belts of country — the Great Plains and the Great Basin— are forestless though not treeless. This distribution is controlledlargely by rainfall, though the distribution of species within each regionis also controlled by insolation, temperature, wind velocity, water supply,and geographic relation to postglacial centers of dispersal. By thesame token the forests are not distributed evenly over a given region, 124 FOREST PHYSIOGRAPHY. S -5 -^ 3 a c a ??^ t*-i o _on O -«-> H >-• c 11 o -ij Ul (Tt a 3 c S: 4^ S s I ?^ IS c^ t: ^ ^ ?* S o < C S K O W O C cj ^ t3 ! i -S -a S 1 C d S 0) . ^ a to ;„- , Ic ^ • Si I ?£ OJ ° o - -s J2 tJ o -^ c fi ^ -a ?^ o ? 3 3 ;;,- -5 •3 - ra*j 3 r; i ^ -^ % ? 1 S ^ hS ^ -5 I. c- c S °- 1 to u Ph cD -C _ o i O o o 3 m O o ! C _ ^^ 3 S o ^ 3 =^ ^ ^ . IS ° PHYSIOGRAPHIC, CLIMATIC, AND FOREST REGIONS 125 but vary from windward to leeward slopes, from warm southern to coolnorthern slopes, and from dry to wet situations as controlled by morelocal conditions. The eastern or Atlantic forest tract consists largely of hardwoods,though large tracts of conifers are also found; the western forests areprincipally conifers of unrivaled size and beauty and hardwoods arecomparatively rare. The great variety and in some cases the great sizeof the trees of the Atlantic forest
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
