Abstract
Abstract The effects of increasing nutrient availability and liming on the growth of Dactylis glomerata and its neighboring vegetation were studied in dry heath communities dominated by Empetrum rubrum from northern Tierra del Fuego (Argentina). We carried out three pot experiments and a field experiment using acid heath soils collected from communities dominated by different degrees of cover by E. rubrum. All studies were consistent in showing high responses of D. glomerata to phosphorus (P) additions. Lime amendments depressed plant growth. This was attributed to two effects, increased sorption of added P by lime and decreased desorption of native P. The results also showed that the growth of D. glomerata on soil containing a high proportion of E. rubrum leaf litter was severely depressed. In the field experiment, additions of P increased the growth of D. glomerata and other grass species. This suggests that increasing nutrient availability may change the competitive relationship between shrub species a...
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