A working plan for forest lands near Pine Bluff, Arkansas . lar. Now it is apparent that if no breaks occurred in the curves at the22-inch point, the lines would have continued on as indicated by theshort broken lines oi the diagram, and the number of trees per acre ofsmaller diameter would have been much larger. In other words, thenumber of trees in the smaller diameter classes at the present time isinsufficient to maintain the present stand of mature trees. Loblolly Pine, when 22 inches in diameter, is about 1 years curves show that the proportion of younger tree- has beenreduced by
A working plan for forest lands near Pine Bluff, Arkansas . lar. Now it is apparent that if no breaks occurred in the curves at the22-inch point, the lines would have continued on as indicated by theshort broken lines oi the diagram, and the number of trees per acre ofsmaller diameter would have been much larger. In other words, thenumber of trees in the smaller diameter classes at the present time isinsufficient to maintain the present stand of mature trees. Loblolly Pine, when 22 inches in diameter, is about 1 years curves show that the proportion of younger tree- has beenreduced by some disturbing influence. Such an influence is tire —not a great fire, but repeated fires of ordinary severity, such as theforest now suffers from. As the region was slowly entered by settler-these files would begin. The trees which are now one hundred yearsold had by that time reached such a development that they were notaffected: the injury was then, as now. chiefly to the young growth. 12 WORKING PLAN FOR FOREST LANDS NEAR PINE BLUFF, DIAMETER BREAST HIGH-INCHES. Fig. 1.—Diagram showing the number of trees per acre for Shortleaf and Loblolly Pine and for thetwo species combined on a diameter breaslhigh. GRAZING. 13 How old the trees must have been to escape damage would dependchiefly on the intensity of the fires. It is probable that the first oneswere the most severe, from the accumulation of fuel which they wouldfind. On the whole, one would conjecture from the condition of theforest that they began about seventy-rive years ago. It was in 1819 that Arkansas, acquired by the United States a- a partof the Louisiana Purchase in 1803. received a separate Territorialorganization, and in 1837 that it was admitted as a State. The settle- 401 i i , i i :i ...i. .i -, i / j. 36 32
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