Tag: Savanna

Oak Tree Effects on Soil and Herbaceous Vegetation in Savannas and Pastures in Wisconsin

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Author: Ko, Leonora J.; Reich, Peter B. Description: To study tree/nontree interactions, soil characteristics, aboveground biomass and plant composition were compared in areas under and adjacent to canopies of open grown bur oaks (Quercus macrocarpa) and northern pin oak x black oak hybrids (Q. ellipsoidalis x velutina) in two savannas and two pastures in S-central Wisconsin. One savanna and one pasture were paired on loam soils, the other sites were on sandy soils. In general, soil moisture was higher below tree canopies than outside canopies during a drying trend and…

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Influences of Trees on Savanna Productivity: Tests of Shade, Nutrients, and Tree-Grass Competition

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Author: Belsky, A. Joy Description: To determine why herbaceous productivity in tropical and subtropical savannas is often significantly higher under crowns of isolated trees than in adjacent grasslands, experimental plots were established in three concentric zones, crown, tree-root, and grassland, surrounding isolated trees of Acacia tortilis in low-rainfall and high-rainfall savannas in Tsavo National Park, Kenya. Plots were fertilized (to determine the importance of nutrient enrichment by trees), shaded (to determine the importance of crown shade), fertilized and shaded (to identify fertilizer x shade interactions), or trenched (tree roots entering…

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