Perennial grass response to 10-year cattle grazing in the Mendoza plain, mid-west Argentina
Perennial grass response to 10-year cattle grazing in the Mendoza plain, mid-west Argentina
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DOI：
10.1006/jare.2002.1002
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发表时间：
2002-11
影响因子：
2.7
通讯作者：
J. Guevara;O. R. Estevez;C. Stasi;J. Gonnet
中科院分区：
文献类型：
--
作者：
J. Guevara;O. R. Estevez;C. Stasi;J. Gonnet
在1990年和2000年，对两种放牧策略（全年连续放牧和轮牧）和四种放牧强度（未放牧;轻度、中度和重度放牧）下的多年生牧草总的、不需要的、中间的和首选的草的底面积（cm 2 m-2）和密度（植物m-2）进行了监测。放牧强度对多年生禾草断面积有显著影响。断面积和密度的所有草群往往是在2000年高于1990年的所有放牧强度，但放牧处理并没有表现出显着差异，断面积和密度增加，从1990年到2000年的所有提到的草群。可以提出几个假设来解释有限的草对治疗的反应。所采用的放养率可能太低，不会产生重大影响。草似乎是耐放牧强度下使用的和每年发生的干旱在7 9的最后一年的研究。鉴于在这种环境中的重放牧的历史，这是可能的，已经观察到的是自然的断面积和植物密度的时间变化。
Abstract Basal area (cm2 m−2) and density (plants m−2) for total, undesirable, intermediate and preferred perennial grasses were monitored in 1990 and in 2000 in response to two grazing strategies (yearlong continuous and rotational) and four grazing intensities (ungrazed; light, moderate and heavy grazing). Grazing intensity had a significant effect on basal area of perennial grasses. Basal area and density for all the grass groups tended to be higher in 2000 than in 1990 for all grazing intensities but the grazed treatments did not show significant differences in basal area and density increases from 1990 to 2000 for all the mentioned grass groups. Several hypotheses could be advanced to explain the limited grass response to treatments. The stocking rates applied may have been too light to cause significant effects. Grasses appear to be resistant under the grazing intensities used and the annual drought occurring during 7 of the 9 last years of the study. Given the history of heavy grazing in this environment, it is possible that what has been observed is natural temporal variation in basal area and plant density.