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Do Species Mixtures Increase Above- and Belowground Resource Capture in Woody and Herbaceous Tropical Legumes?

^a MacArthur Agro-Ecology Res. Cent., 300 Buck Island Ranch Rd., Lake Placid, FL 33852
^b Kenya Forestry Res. Inst., P.O. Box 20412, Nairobi, Kenya
^c Dep. of Agric. Sci., Imperial College at Wye, Univ. of London, Wye, Kent, TN25 5AH, UK

View larger version (21K): [in a new window]   Fig. 1. Total monthly rainfall (mm) received between June 1997 and May 1998 at Nyabeda, western Kenya.

View larger version (28K): [in a new window]   Fig. 2. Leaf area index (LAI) for single species and groundnut (Gnut) mixtures at 2 and 3 mo after planting (MAP) at Nyabeda, western Kenya, in 1997–1998.

View larger version (129K): [in a new window]   Fig. 3. (a) Total aboveground biomass (Mg ha-1) and (b) total foliage biomass (Mg ha-1) for species grown in mixtures at Nyabeda, western Kenya, in 1997–1998.

View larger version (26K): [in a new window]   Fig. 4. Effect of competition on changes in plant N for a given species when mixed with other species at Nyabeda, western Kenya, in 1998. Standard error of the difference in means (SED) bars are for comparison of total plant N differences for a respective species in mixtures and in sole stand.

View larger version (78K): [in a new window]   Fig. 5. Changes in mineral N (NH4–N plus NO3–N, kg ha-1) at fallow harvest compared with mineral N at planting in different soil layers as affected by (a) monocrop fallows and crop systems and (b) mixed fallows, natural fallow, and calliandra monocrop fallows at Nyabeda, western Kenya. Standard error of the difference in means (SED) bars are for comparison of total mineral N values between treatments means.

View larger version (35K): [in a new window]   Fig. 6. Effect of different types of fallows on soil water content 6 mo after fallow establishment in the field experiment at Nyaeda, western Kenya, in 1998. Standard error of the difference in means (SED) bars are for comparison of volumetric water content values between fallow treatment means.