Short‐term response of preferred and unpreferred species to sheep grazing in a Patagonian steppe

摘要：

Patagonian steppes are subjected to severe grazing‐induced desertification processes (León & Aguiar 1985 ), usually leading to the dominance of unpreferred plant species at the expense of preferred ones (Cingolani et al.2005 ).It is commonly accepted that grazing constitutes a selective pressure favourable to unpreferred plants, more stress tolerant than preferred ones ( Chapin et al.1987 ).However, this hypothesis was rarely based on short‐term field measurements under known grazing pressures.Here we tested general hypothesis in the Patagonian steppe by measuring the change in plant cover of preferred and unpreferred species along a growth season under known grazing pressures.

关键词： Sheep grazing cover preferred species unpreferred species

作者: Valenta,M.D Golluscio,R.A.

作者单位: Cátedra Forraj icultura,Facultad de Agronomía,UBA;Cátedra Ovinotecnia,Facultad de Agronomía,UBA Cátedra Forraj icultura,Facultad de Agronomía,UBA;CON ICET.

会议类型: 国际会议

会议名称: 2008世界草地与草原大会

会议地点: 呼和浩特

会议语种:英文

在线出版日期: 2008-06-29（万方平台首次上网日期，不代表论文的发表时间）