. The distribution of vegetation in the United States, as related to climatic conditions. Phytogeography. 508 CORRELATION OF DISTRIBUTIONAL FEATURES. Cape Disappointment are far exceeded by the still more moist condi- tions of Cape Flattery. In short, the difference between the values of the moisture ratios in moderately moist localities in the Northwestern Forest and in the most moist localities is as great as the differences which have already been seen to play such an important role in deter- mining the distribution of the vegetation in the remainder of the United States. It is unfortunate
. The distribution of vegetation in the United States, as related to climatic conditions. Phytogeography. 508 CORRELATION OF DISTRIBUTIONAL FEATURES. Cape Disappointment are far exceeded by the still more moist condi- tions of Cape Flattery. In short, the difference between the values of the moisture ratios in moderately moist localities in the Northwestern Forest and in the most moist localities is as great as the differences which have already been seen to play such an important role in deter- mining the distribution of the vegetation in the remainder of the United States. It is unfortunate that the inadequacy of the climatological data gives this region the appearance of being exceeded in the normal mean relative humidity of the frostless season by the western section of the Northern Mesophytic Evergreen Forest, an appearance that is prob- ably misleading. The sunshine conditions are also imperfectly known for this area. The moisture-temperature index for the frostless season has already been shown to be closely similar in values and in amplitude for this most hygrophytic of the vegetations of the United States and for the Desert. In forming the product by which this compound condition has been secured, the high temperature summation of the desert, together with the low moisture indices, and the low temperature sum- mations of the Hygrophytic Forest, together with its high moisture indices, have given results which are closely identical. Southeastern Mesophytic Evergreen Forest (fig. 33).—In viewing the entire series of blocks drawn to represent the chief climatic conditions of this region, it will be noted that there is, in general, a wide ampli- tude of nearly all conditions, including those of temperature and precipitation, and excepting only the imperfectly exhibited mean annual precipitation and the relative humidity. The amplitude of the moisture ratios is no greater than in the case of the Deciduous Forest tcmperatube Days in Normal F,.3stixss Season <
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphytoge, bookyear1921
