| 李友宏,董莉丽,王芳,张建明.宁夏银北灌区灌淤土营养元素空间变异性研究[J].干旱地区农业研究,2006,(6):68~72 |
| 宁夏银北灌区灌淤土营养元素空间变异性研究 |
| Spatial variability of nutrients in irrigation-silted soil in north Yinchuan Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2006.06.16 |
| 中文关键词: 灌淤土 营养元素 空间变异 银北灌区 |
| 英文关键词:irrigation-silted soil nutrients spatial variability geostatistics |
| 基金项目:加拿大钾磷肥研究所北京办事处资助项目；宁夏自然科学基金(NZ0632) |
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| 中文摘要: |
| 规则网格取样,传统统计学和地统计学方法分别进行资料分析,研究宁夏银北灌区灌淤土耕层土壤有机质和速效Ca、Mg、N、K、P、S含量分布特征及其空间变异性。结果表明,研究区土壤有机质、氨态N和速效K、P含量普遍较低,低于临界值的比例分别为100%、11.8%和22.7%,而Ca、Mg和S含量处于较高水平;速效Ca的变异系数最大为131.13%,其它元素变异系数32.97%~77.45%。利用球型模型对各元素的实验半变异函数进行拟合,结果表明,速效N在田间尺度的空间自相关性表现为纯块金效应,说明其空间变异性主要受灌溉、作物类型、施肥等随机因素影响。而有机质、Ca、Mg、K、S具有较强的空间结构,块金效应在1.6%~20%之间。由于速效P含量的预测值和测量值在0.01水平未达到显著相关,仅用普通克里格插值法绘制了土壤速效Ca、Mg、K、S含量分布图,以直观地反映其空间变异性。 |
| 英文摘要: |
| Spatial distribution and variability of organic matter,available Ca,Mg,N,K,P,S in irrigation-silted soil in Huinong,Ningxia Hui Autonomous Region were characterized using classic statistics and geostatistics with grid sampling and systematic approach for soil nutrients status evaluation.The results showed that the content of the organic matter,N,K and P in topsoil were deficient and the percentage of soil available N,K,P below critical values were 100%,1.8% and 22.7%,respectively.On the other hand,the content of Ca,Mg and S was abundant,even excessive.The variation coefficient of available Ca was the highest(131.13%) and that of the other available nutrition elements was between 32.97% and 77.45%.The spherical model was used to model the experimental semivariogram.Spatial autocorrelation of organic matter,Ca,Mg and K was strong and the ratios of nugget to sill+nugget of them were between 1.6 and 20%.Whereas spatial autocorrelation of N showed pure nugget,which indicates the spatial variability was mainly influenced by random factors such as irrigation,fertilization and management.Ordinary kriging interpolation was used to map the available content of Ca,Mg,K,S. |
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