Ecological investigations upon the germination and early growth of forest trees ecologicalinves00boer Year: 1916 82 Richard H. Boerker the difference in both cases is greater for the variety that comes from the drier climate, that is, the South Dakota variety of Pinus ponderosa shows a greater difference than the Idaho variety and the New Mexico variety of Pseudotsiiga taxifolia shows a greater difference than the Colorado. The data here presented upon this phase of the problem, however, are not sufficient to warrant conclusions. GENERAL SUMMARY AND CONCLUSIONS I. The Effect of Habitat Facto
Ecological investigations upon the germination and early growth of forest trees ecologicalinves00boer Year: 1916 82 Richard H. Boerker the difference in both cases is greater for the variety that comes from the drier climate, that is, the South Dakota variety of Pinus ponderosa shows a greater difference than the Idaho variety and the New Mexico variety of Pseudotsiiga taxifolia shows a greater difference than the Colorado. The data here presented upon this phase of the problem, however, are not sufficient to warrant conclusions. GENERAL SUMMARY AND CONCLUSIONS I. The Effect of Habitat Factors upon Gennination 1. Shade decreases evaporation and transpiration and thereby increases the soil-moisture content of the superficial soil layers. This increase in soil moisture content is best shown by the ac- companying diagram. This conclusion agrees with the results obtained by Stewart and Hasselbring who grew tobacco in shade tents. 2. Shade accelerates germination, that is seeds germinate sooner in the shade than in the light. This acceleration is due to the increase in soil-moisture content spoken about above. /o opet7 Diagram showing soil moisture content in the three light cultures.
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