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中文摘要：
本文分析了青藏高原东缘高寒湿地在全年放牧、冬季放牧和全年禁牧3种放牧模式下土壤理化性质的变化，探讨其在不同土层深度的变化及季节性动态。结果如下：1）沿着全年禁牧—冬季放牧—全年放牧3种放牧模式，土壤表层（0～15 cm）及下层（15～30 cm）的土壤含水量和有机碳含量显著减小。2）土壤含水量、有机碳、全氮、全磷和速效氮含量均随土层深度的增加而降低，而速效磷表现为无规律。3）3种放牧模式下表层土壤有机碳含量均为：9月＞5月＞7月；全氮和全磷含量一般都在9月份较高，而速效氮和速效磷含量9月份最低，每种放牧模式下它们之间的具体差异也不完全相同。4）除5月份，两个土层土壤全氮含量均与有机碳含量呈极显著正相关。综上，全年放牧模式加快了土壤中 C、N、P 的周转，使土壤养分输出量增加，进而导致土壤肥力下降，草地退化。
英文摘要：
The seasonal characteristics of soil physical and chemical properties under different grazing patterns （annual grazing,winter grazing,no-grazing）were studied on an alpine wetland of the eastern Tibet Plateau. The main results were：soil moisture and soil organic carbon content at the surface（0-15 cm）and sub-surface （15-30 cm）layers were highest under non-grazing and lowest under annual grazing.2）For all treatments, soil moisture,organic carbon,total nitrogen,total phosphorus and available nitrogen significantly declined with increasing soil depth,however,available phosphorus was not affected by soil depth.3）The surface soil organic carbon content of all treatments showed the same seasonal pattern;September〉May〉July and soil to-tal nitrogen and total phosphorus content were generally higher in September.4）Total nitrogen content in both soil layers were significantly positively correlated with soil organic carbon content in July and September. It is concluded that annual grazing increases carbon,nitrogen and phosphorus cycling and increases nutrient los-ses,leading to decreased soil fertility and declining grassland quality.
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