Long‐term cattle grazing affected specific leaf area and its components in two range plant species

摘要：

Specific leaf area (SLA), leaf thickness and density influence plant survival, metabolism and nutritional value.However, systematic measurement of these plant attributes on grazed rangelands is poorly documentedy.We studied 2 dominant cool‐season grasses, Pascopyron smithii Rydb., and Poa p ratensis L., growing in North Dakota rangelands at 587 m a.s.l., with continental climate (mean‐17 and ＋ 20 ℃ in Jan and Aug ; 458mm rain/yr, with circa 70％ during May‐Sep).Grasses dominate ; forbs contribute 20％ and shrubs 2％ of the peak standing crop.The area has been grazed/exclosed for 15 years under a grazing intensity study (Patton and Nyren, 1988).

关键词： Pascopyron smithii Rydb . Poa p ratensis L . specific leaf area cattle grazing rangelands

作者: Xuejun Dong Paul Nyren Bob Patton Brian Kreft Anne Nyren

作者单位: North Dakota State University,Central Grasslands Research Center,4824 48th A V E SE,Streeter,North Dakota 58483USA.

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）