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首页> 外文期刊>The Rangeland Journal >Global positioning systems indicate landscape preferences of cattle in the subtropical savannas.
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Global positioning systems indicate landscape preferences of cattle in the subtropical savannas.

机译：全球定位系统显示了亚热带稀树草原上牛群的景观偏好。

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摘要

Large paddocks, a heterogeneous landscape and widely dispersed water points provide challenges for the sustainable grazing management of northern Australian beef properties. Determining grazing animal distribution and relating this to features in the landscape, including artificial water points, can assist in the sustainable management of these environments. This case study describes the distribution and landscape association of cattle for part of a single wet season. Twelve Brahman cows were fitted with global positioning system (GPS) collars for 8 weeks in a 1530 ha paddock that contained a diversity of land-types and a single artificial water point. Grazing preferences were initially limited to a 250-ha cleared area of clay soil sown with Cenchrus ciliaris. Thereafter, animals moved on to less fertile outlying areas of Eucalyptus and Acacia agyrodendron native pasture woodland. Mean convex polygon, the smallest polygon that contained 90% of positional data, increased from 229+or-37.6 ha to 449+or-80.3 ha over the first 3 weeks of the study. Animals avoided areas dominated by steep terrain and the preference index (proportion of GPS locations that occurred in a land-type divided by its relative cover) was less than unity for 71% of the paddock area. Although the performance of the GPS units was disappointing, the study verifies that GPS telemetry and satellite imagery can be used to quantify cattle distribution and probable grazing preferences in the extensive, spatially heterogeneous paddocks of northern Australia.
机译：大型牧场，异质景观和广泛分布的水位为北澳大利亚牛肉业的可持续放牧管理提出了挑战。确定放牧动物的分布并将其与景观特征（包括人工水位）相关联，可以帮助对这些环境进行可持续管理。本案例研究描述了单个湿季的一部分牛的分布和景观关联。在1530公顷的小牧场中，将十二头婆罗门牛的全球定位系统（GPS）项圈安装了8周，该小牧场包含多种土地类型和一个人工水位。放牧优先权最初仅限于用Cenchrus ciliaris播种的250公顷清除土地的粘土。此后，动物转移到桉树和金合欢杜鹃原生牧场林地的贫瘠边缘地区。在研究的前三周中，平均凸多边形（包含90％位置数据的最小多边形）从229+或-37.6公顷增加到449+或-80.3公顷。动物避开了由陡峭地形主导的区域，并且对于围场面积的71％，偏好指数（发生在陆地类型中的GPS位置比例除以其相对覆盖）小于1。尽管GPS单位的性能令人失望，但该研究证实GPS遥测和卫星图像可用于量化澳大利亚北部广泛，空间异质的牧场中的牛群分布和可能的放牧偏好。

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