在桂林国家森林公园选择不同的植被群落类型进行空气离子浓度监测，研究森林游憩区空气负离子浓度水平变化。
To study the variation of aero-anion concentration in forest recreational areas, the concentrations of aero-ion were measured under different vegetation types in Guilin National forest Park.
采用最小距离方法逐步聚类分析，对理水调洪型植被群落分为高功能理水调洪型、一般功能理水调洪型、低功能理水调洪型、功能退化型4个等级。
The clustering analysis of least distance method was applied, the results showed that types of the phytocoenosium are 4: high function, commonly function, low function and degenerative function type.
与此相反，大多数驯服的牛会以小群落存在并长时间的呆在同一个地方，而这对草地植被的健康非常不利。
In contrast, most domesticated cattle are kept in small herds that are stocked for long periods in the same place - a practice that doesn't encourage healthy grasses.
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