Graduate Thesis Or Dissertation
 

The effect of diversity and spatial arrangement on biomass of agricultural cultivars and native plant species

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  • Species and cultivar combinations have been relatively well studied, though little is known about the influence of spatial arrangement on agricultural or native plant mixtures. The effect of spatial pattern on mixtures was explored in three experiments. In the first two, agricultural and native plants were planted in two-way mixtures that included combinations of cultivars, species, genera, or functional groups. Each combination was arranged as a random mixture within rows, alternating rows of different genotypes or species, and as alternating pairs of rows. Biomass was determined for each mixture component and compared to monoculture controls. In the third experiment, two wheat cultivars were planted in seven treatments in the 2000-2001 winter wheat season and three cultivars were planted in 18 treatments in the 2001-2002 season. One cultivar was always planted at full rate, and a second cultivar was added at 1/4 rate, either randomly mixed, or between rows of the other cultivar. Performance was measured in terms of seed yield. The specific species or cultivar combination had the most consistent influence on aboveground biomass or seed yield, while the effect of spatial arrangement was significant in few treatments.
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