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中文摘要：
利用GPS和GIS技术，研究了江西省兴国县潋水河流域小、中和大3种尺度下土壤氮素的空间分布特征。结果表明，土壤全氮和有效氮在小、中和大3种尺度下呈正态或对数正态分布，但二者均值随研究尺度的扩大而增加。其中，土壤全氮平均含量分别为0．60gkg^-1、0．73gkg^-1和0．83gkg^-1，有效氮含量为64．8mgkg^-1、66．3mgkg^-1和80．2mgkg^-1。这3种尺度区土壤全氮和有效氮含量的空间变异函数参数和空间分布特征并不相同。因此，二者空间变异表现出明显的尺度效应。网格抽样和分层抽样相结合的采样方法均适合丘陵区小、中和大3种尺度下土壤氮素分布的研究。它们的合理采样数在90％置信度下分别为原采样方案样点数的82．6％、71．2％和58．1％，在95％置信度下分别是原采样方案样点数的95．7％、94．2％和89．2％。
英文摘要：
With GPS and GIS method, the distribution of soil nitrogen at microscale, mesoscale and macroscale was studied in Lianshui Basin, Xingguo County, Jiangxi Province. The results suggest that both the total nitrogen and available nitrogen showed normal or lognormal distribution at the three different scales, but their means increased along the scaleup. In the multi-scales, mean total nitrogen contents were 0.60 g kg ^-1, 0.73 g kg ^-1 and 0.83 g kg ^-1 respectively, and mean available nitrogen were .64.8 mg kg^-1, 66.3 mg kg^-1 and 80.2 mg kg^-1, respectively. The spatial variability of soil total nitrogen and available nitrogen showed obvious scale effect with the different semivariogram parameters and spatial distribution for the muhiscales. The combined sampling method of griding with stratifying is suitable for the study of spatial variability of soil nitrogen at the multi-scales in hilly area. Their reasonable sample points were 82.6% ,71.2% and 58.1% of the initial sampling points under the 90% confidence level, and those were 95.7 %, 94.2 % and 89.2 % under the 95 % confidence level, separately.
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