固定轮牧时间对短花针茅荒漠草原土壤速效氮空间分布的影响
首发时间:2013-01-08
摘要:研究以固定轮牧时间下的短花针茅荒漠草原为研究对象,采用变异分析、地统计分析和分形理论等研究方法,揭示荒漠草原土壤速效氮含量的空间分布对固定轮牧时间的响应。主要研究结果如下,随着轮牧时间的推移,土壤速效氮含量呈显著增加的变化趋势;土壤速效氮含量空间分布在单位均值上的差异和空间自相关尺度上均呈减小的变化趋势,分形维数在逐渐增大。中期放牧区(RG4)土壤速效氮含量具有特有的分布特点,可能存在较高的空间分布复杂性。在实行划区轮牧的草原上,不宜常年采用固定轮牧时间进行放牧。
关键词: 草地生态与管理 固定轮牧时间 荒漠草原 空间异质性 土壤速效氮
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Effect of fixed rotational grazing time on spatial heterogeneity of soil available nitrogen in Stipa breviflora desert steppe
Abstract:The paper studied on spatial heterogeneity distribution of soil available nitrogen in fixed rotational grazing time, which in order to reveal the effect on that of soil available nitrogen under different fixed rotational grazing time in desert steppe using variation analysis, geostatistical analysis and fractal theory methods. The main results were as follows, the soil available nitrogen content significantly increased with rotational grazing time delayed, which of spatial distribution differences in unit mean and spatial autocorrelation both decreased, while the fractal dimension increased gradually. In the mid-rotational grazing areas(RG4), the spatial distribution of soil available nitrogen has special distribution characteristics, which may had higher complexity spatial distribution. It was not appropriate for grazing with fixed rotational grazing time in rotational grazing grassland.
Keywords: The ecosystem and management fixed rotational grazing time desert steppe spatial heterogeneity soil available nitrogen
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固定轮牧时间对短花针茅荒漠草原土壤速效氮空间分布的影响
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