Abstract
Life forms interactions in semiarid Mediterranean annual grassland community
Highlights
Middle Eastern Mediterranean grasslands have evolved 8000-9000 years before present (BP) (Harlan 1975; Hunt & al. 2004)
The experimental defoliation exerted a pronounced effect on plant productivity and modified the nature of interaction between annual grasses and other growth forms. These mechanisms may explain the ability of Avena and Hordeum species to form persistent annual climax grasslands in semi-arid rangelands
These findings may suggest that Avena and Hordeum species may be used in revegetating degraded areas in the north-eastern part of Jordanian Mediterranean grasslands
Summary
Middle Eastern Mediterranean grasslands have evolved 8000-9000 years before present (BP) (Harlan 1975; Hunt & al. 2004). Three mechanisms have been used to explain the relationship between site productivity and competitive interactions among plant species. The first of these mechanisms shows that competition can be intense in high-productivity locations and reduced in low-productivity environments (Grime 1979; Huston 1979; Keddy 1989). 1990) was used to explain the mechanism of competition between plants This theory suggests that there is no causal relationship between productivity and competition, and that the primary determinant of competition is the ratio of supply of resources to demand it, and this ratio depends on the frequency of disturbance events such as drought and grazing
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