亚热带灌丛草地产量动态及山羊利用率研究

Studies on Forage Biomass Dynamics and Utilization Rates by Goats on a Subtropical Shrubland in China

研究了长江三峡地区灌丛草地不同放牧强度下，草地植物产量、放牧利用率以及再生能力的变化。结果表明，三峡地区灌丛草地牧草总产量构成及季节变化，主要取决于禾草类的季节消长，且两者变化趋势基本一致，草群结构中，以禾草占主导地位，其次是杂类草，两者产量构成为2．8：1．0；两种牧压下山羊对灌木植物的采食利用率差异不显著（P〉0．05），牧压不同，灌木植物的再生速率间差异也不显著（P〉0．05）；利用率为55％时，计算所得该区适宜的载畜量为每公顷灌丛草地养3．4只山羊。

A study on changes of plant biomass, grazing utilization ratio and regrowth abilities was conducted under the different grazing intensities on a shrubland in the Three Gorges Region of Yang-tze River. The results showed that the total yield on a shrubland depended mainly on production of grasses and their changing trends were consistent. The proportions of yield composition of grasses and forbs were 2.8 and 1.0 respectively. Differences in goat ingestion and regrowth rates of shrubs under two grazing intensities were insignificant （P〉0.05）. The suitable stock capacity under 55% of grazing utilization ratio was 3.4 goats per hectare on a shrubland.