%0 Journal Article
%T Spatial Variability and the Relationships of Soil Mineral N and Topographic Factors in a Small Watershed<br>小流域土壤矿质氮与地形因子的关系及其空间变异性研究
%A WANG Yun-qiang
%A ZHANG Xing-chang
%A LI Shun-ji
%A ZHANG Jing-li
%A <br>王云强
%A 张兴昌
%A 李顺姬
%A 张景利
%J 环境科学
%D 2007
%I 
%X Objective of this study was to understand the spatial pattern of soil properties and topographic factors and their relationships in a small watershed. We used classical statistical coupling with geo-statistical theory to characterize and compare the spatial variability of soil mineral N and topographic factors in the wind-water erosion crisscross region on the Loess Plateau. The results show that: 1) The nitrate's variable extent is strong while other properties are moderate variability, and the impacts of soil types, land uses on variable extent are significant. 2) All properties have different spatial dependence extent in the study area. Ammonium and elevation are strong spatial dependence while nitrate, slope gradient and slope aspect are moderate spatial dependence. 3) The analysis results of fractal dimension and spatial heterogeneity proportion are coherent, and the decreased sequence is: nitrate (1.9826) > slope aspect (1.9767) > slope angle (1.9420) > ammonium (1.8791) > elevation (1.7461). 4) In 0 degrees C/90 degrees C, 45 degrees C/135 degrees C aspects, nitrate is isotropy while elevation is anisotropy, and others are weak anisotropy. 5) Ammonium and elevation have strong spatial autocorrelation while nitrate has not. There exist extremely notable positive correlations between nitrate and ammonium, slope gradient and aspect, and the negative correlations between ammonium, slope aspect and elevation, which indicate that the distribution of ammonium and slope gradient have elevation gradients.
%K mineral N
%K topographic
%K spatial variability
%K geostatistics
%K fractal dimension<br>矿质氮
%K 地形
%K 空间变异性
%K 地统计
%K 分维数
%K 小流域
%K 土壤矿质氮
%K 地形因子
%K 关系
%K 空间变异性
%K 研究特性
%K Small
%K Watershed
%K Factors
%K Mineral
%K N
%K Soil
%K Relationships
%K Variability
%K 梯度性
%K 空间分布
%K 负相关
%K 正相关性
%K 空间自相关性
%K 各向异性结构
%K 各向同性
%K 方向
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=BC85E858628321E186107C3CDA89BD77&yid=A732AF04DDA03BB3&vid=D3E34374A0D77D7F&iid=DF92D298D3FF1E6E&sid=E30A3BF9610C35C9&eid=FAE014814EB8ABBA&journal_id=0250-3301&journal_name=环境科学&referenced_num=4&reference_num=24