作者: P Cale , R Hobbs
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摘要: This article presents work which studied the effects of soil nutrient status on degradation roadside vegetation in wheatbelt Western Australia. In particular, we weed invasion and insect herbivores. Road verges Kellerberrin district Australia are severely affected by enrichment presumably from adjacent agricultural areas. road dominated mallee, Eucalyptus erythronema, percentage cover diversity exotic species annuals perennials show significant increases that correspond to phosphorous. There gradients nutrients across high levels paddock side verge low side, these similar species. The influence observed resultant native is unclear. It appears may increase species, but also competitiveness so ultimately be detriment Considerable methodological problems were encountered while investigating defoliation insects verges. made reliable conclusions based findings difficult, some trends apparent. erythronema (10+/- 1%) compared other studies. Defoliation within reserves (8+/- not significantly different those no correlations between E. either foliar nitrogen or nitrate ammonium levels. Nor was there any correlation Some recommendations for methods reduce enrichment, hence decrease level verges, discussed. For covering entry conference, see IRRD abstract no. 843352.