摘要
以荒漠草原不同放牧制度下表层土壤氮素含量为研究对象,采用GS+软件和地统计学分析方法对其空间异质性分布进行了研究。结果显示,划区轮牧区表层土壤碱解氮含量显著低于对照区和自由放牧区,土壤全氮含量没有发生显著性变化。样点间土壤氮素含量差异表明,表层土壤氮素含量存在空间异质性。划区轮牧使得土壤碱解氮含量和土壤全氮含量空间分布受随机因素影响大,自由放牧使土壤全氮含量空间分布受随机因素影响大,围封状态的对照区土壤碱解氮含量和土壤全氮含量空间分布几乎不受随机因素影响。划区轮牧能够减小土壤氮素空间分布的异质性,自由放牧导致表层土壤碱解氮含量空间差异较大。在划区轮牧区,土壤碱解氮含量和土壤全氮含量空间分布都比较均匀,呈片状分布,自由轮牧区土壤碱解氮整体呈破碎斑块分布。
The spatial heterogeneity of nitrogen in top soil under different grazing systems in desert steppe was analyzed with GS＋ software and geo-statistics analysis method.The results showed that affected by different grazing systems,the nitrogen content in topsoil in rotational grazing area was significantly lower than that in continuous grazing area and banning grazing area,the content of total nitrogen was not significant diversification.Differences in nitrogen content in samples showed that there was spatial heterogeneity among the soil nitrogen content in topsoil.Rotational grazing made the spatial distribution of alkaline-resolved soil nitrogen content and total soil nitrogen content more affected by random factors,while free grazing made spatial distribution of total soil nitrogen content more affected by random factors,the spatial distribution of alkaline-resolved soil nitrogen content and total soil nitrogen content in enclosed pasture were almost not affected by random factors.Rotational grazing can reduce the heterogeneity of spatial distribution of soil nitrogen and free grazing can cause greater spatial differences in soil nitrogen content.In rotational grazing area,spatial distribution of alkaline-resolved soil nitrogen and total soil nitrogen was relatively uniform,alkaline-resolved soil nitrogen in free grazing area distributed in a broken plaques as a whole.
出处
《中国草地学报》
CSCD
北大核心
2011年第2期51-56,74,共7页
Chinese Journal of Grassland
基金
内蒙古科技创新引导奖励资金项目"内蒙古退化植被恢复技术和定向经济型植物产业化种植基地建设与示范"(20082002)
国家公益性行业(农业)科技项目(200903060)资助
关键词
荒漠草原
土壤氮含量
空间异质性
地统计
Desert steppe
Soil nitrogen
Spatial heterogeneity
Geo-statistics
