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• i <br />20 <br />Table 1. Relative canopy cover (~) values of major species and growth form <br />groups and species r ichness value s on nitrogen, control, and <br />sucrose plots. Values are overall means from 4 plots per treatment <br />averaged over 3 years. Confidence intervals of the means are based <br />at the P < 0.05 level. <br /> <br />Variable Nitrogen Control Sucrose <br />Chrvsothamnus nauseosus 0.3 + 0.9 1.1 + 0.8 3.2 + 3.4 <br />Aaropvron smithii 0.5 ± 0.5 1.2 ± 1.5 2.3 ± 2.6 <br />ster canescens 0.1 ± 0.1 0.7 ± 1.1 1.7 ± 1.1 <br />Melilotus officinalis 0.6 + 0.7 1.2 + 1.4 3.1 + 2.6 <br />Sohaeralcea coccinea 0.7 +_ 0.6 1.5 +_ 1.0 1.0 + 0.6 <br />Kochia sconaria 66.4 + 20.7 52.1 + 16.9 33.2 + 17.1 <br />Salsola iberica 25.6 + 20.3 25.9 + 18.6 34.8 + 21.6 <br />Shrubs 0.5 ± 0.5 1.3 ± 1.0 3.4 ± 3.4 <br />Perennial grasses 0.7 ± 0.6 1.4 ± 1.5 2.6 ± 2.7 <br />Perennial (orbs 2.0 ± 1.1 4.0 ± 2.4 7.8 ± 2.3 <br />Annual grasses 4.0 ± 3.9 13.6 ± 6.4 17.5 ± 8.8 <br />Annual fortis 92.9 ± 4.3 79.7 ± 5.5 68.8 ± 12.4 <br />Number of species 9.4 ± 2.0 11.8 ± 1.5 13.9 ± 1.8 <br />