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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

发表时间:2013-06-15  浏览量:1159  下载量:364
全部作者: 卫智军,刘红梅,吕世杰,吴艳玲,孙树青,运向军
作者单位: 内蒙古农业大学生态环境学院;内蒙古林业科学研究院;内蒙古农业大学理学院;内蒙古师范大学生命科学与技术学院;内蒙古和盛生态育林有限公司;中国农业科学院草原研究所
摘 要: 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。研究结果表明: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: 草原学;固定轮牧时间;荒漠草原;空间异质性;土壤速效氮
Title: Effect of fixed rotational grazing time on spatial heterogeneity of soil available nitrogen in Stipa breviflora desert steppe
Author: WEI Zhijun, LIU Hongmei, LV Shijie, WU Yanling, SUN Shuqing, YUN Xiangjun
Organization: College of Ecology and Environmental Science, Inner Mongolia Agriculture University; Institute of Inner Mongolia Forestry Science Research; College of Science, Inner Mongolia Agriculture University; College of Life Science and Technology, Inner Mongolia Normal University; Hesheng Ecological Afforestation Co., Ltd.; Institute of Grassland Research, Chinese Academy of Agricultural Sciences
Abstract: This study focused on spatial heterogeneity distribution of soil available nitrogen in fixed rotational grazing time. And the effect of spatial distribution of soil available nitrogen on the response of fixed rotational grazing time in desert steppe was investigated using variation analysis, geostatistical analysis and fractal theory methods. The results showed that the soil available nitrogen content significantly increased with rotational grazing time delaying, and the spatial distribution differences decreased both in unit mean and spatial autocorrelation, while the fractal dimension increased gradually. Furthermore, in the mid-rotational grazing areas (RG4), the spatial distribution of soil available nitrogen had special distribution characteristics, which may had higher complexity spatial distribution. Therefore, it was not appropriate for grazing with fixed rotational grazing time in rotational grazing grassland.
Key words: grassland science; fixed rotational grazing time; desert steppe; spatial heterogeneity; soil available nitrogen
发表期数: 2013年6月第11期
引用格式: 卫智军,刘红梅,吕世杰,等. 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[J]. 中国科技论文在线精品论文,2013,6(11):1050-1057.
 
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