Herbage availability and utilisation in small-scale patches in a bahia grass ( Paspalum notatum ) pasture under cattle grazing
Herbage availability and utilisation in small-scale patches in a bahia grass ( Paspalum notatum ) pasture under cattle grazing
复制标题
牛放牧下巴伊亚草 (Paspalum notatum) 牧场小规模斑块的草本可用性和利用
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Hirata
中科院分区：
文献类型：
--
作者：
M. Hirata
在放牧条件下，对巴伊亚草地（Paspalum notatum）小斑块规模（约为饲养站规模）的牧草有效性和利用率进行了研究。在2年5月（晚春）至10月（秋季）的11个放牧期（2 - 7天），利用电子电容探针在沿着2条永久样线的182个固定位置（50 cm × 50 cm）非破坏性地估计放牧前后的牧草质量和落叶率。放牧前后草地牧草质量的空间分布均表现出异质性，表现为不同质量的斑块。牧草质量的空间变异总是随着放牧的增加而增加，在较高的平均牧草利用率下，即在较高的放牧强度下，这种增加更大。动物的牧草消耗量在空间上也各不相同，落叶率在斑块之间存在差异。整个位置的落叶率变得更加均匀的平均牧草利用率的增加，即动物消耗更均匀的牧草量较高的放牧强度下的补丁。落叶率和放牧前牧草质量之间的相关系数随着平均牧草利用率的增加而增加，即在较高的放牧强度下，动物从牧草质量较高的斑块中消耗更多牧草的趋势变得更强。因此，更高的放牧强度导致更均匀的利用补丁减少动物的选择性，但导致更多的变化，在整个补丁的植被。
Herbage availability and utilisation at a scale of small patches (approximately a feeding station scale) were investigated in a bahia grass ( Paspalum notatum ) pasture under cattle grazing. For 11 grazing periods (2‐7 days) between May (late spring) and October (autumn) in 2 years, pre- and post-grazing herbage masses and rate of defoliation were non-destructively estimated with an electronic capacitance probe at 182 fixed locations (50 cm × 50 cm) along 2 permanent line transects. Distribution of herbage mass was spatially heterogeneous both before and after grazing, exhibiting patches with different herbage masses. Spatial variation in herbage mass always increased with grazing, with the increase being greater under higher mean herbage utilisation over the transects, i.e. under higher grazing intensity. Herbage consumption by animals also varied spatially with rates of defoliation differing among patches. Rate of defoliation across the locations became more uniform as the mean herbage utilisation increased, i.e. animals consumed more uniform amounts of herbage from patches under higher grazing intensity. The correlation coefficient between the rate of defoliation and pregrazing herbage mass increased as mean herbage utilisation increased, i.e. the tendency for animals to consume more herbage from patches with higher herbage mass became stronger under higher grazing intensity. Thus, higher grazing intensity resulted in more uniform utilisation of patches by reducing selectivity by animals, but resulted in more variation in vegetation across the patches.