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Spatial Legume Composition and Diversity across Seeded Landscapes

^a Dep. of Agron., Kansas State Univ. Agric. Res. Cent., Hays, KS 67601-9228
^b Dep. of Agron., Iowa State Univ., Ames, IA 50011-1010

View larger version (34K): [in a new window]   Fig. 1. Schematic of one of six typical pasture layouts. Backslopes faced east and west in three pastures (one shown above) and north and south in the other three pastures. Shaded areas indicate experimental units for stocking system and landscape position combinations within which vegetative data were collected three times each season from 1996 to 1998.

View larger version (15K): [in a new window]   Fig. 2. Relationship between species richness and sward legume dry matter (DM) proportion for the continuously stocked, rotationally stocked, and nongrazed pastures, averaged over three harvest periods each season from 1996 to 1998.

View larger version (17K): [in a new window]   Fig. 3. Relationship between legume species dry matter (DM) diversity and legume DM proportion for continuously stocked, rotationally stocked, and nongrazed pastures, averaged over three harvest periods each season from 1996 to 1998. Trend line and coefficient of determination indicate relationship for rotationally stocked pastures only.

View larger version (13K): [in a new window]   Fig. 4. Total forage mass and its relationship to legume species richness, averaged over three harvest periods each season from 1996 to1998.