【摘要】 通过网格采样和土壤养分系统研究法测量了面积为267 hm2灌淤土耕层土壤速效微量元素硼、铜、铁、锰、锌含量,采用传统统计学和地统计学结合的方法,研究了宁夏银北平原灌淤土耕层土壤微量元素田间尺度的空间变异特征。结果表明,研究区耕层土壤微量元素铜、铁、锰、锌的有效态含量呈正态分布,硼呈对数正态分布,其变异系数在30.0%~87.2%;半变异函数分析表明,硼、铜、铁、锰、锌具有各向异性,长轴相关距离分别为550、1 100、700、500、500 m,短轴相关距离分别为200、450、300、250、200 m,块金值/基台值分别为14.3%、11.3%、23.0%、21.7%、23.1%。最后利用普通克立格插值方法绘制了研究区硼、铜、铁、锰、锌的含量分布图,以利于进行土壤微量元素养分的分地块管理。更多还原

【Abstract】 By sampling and testing available B,Cu,Fe,Mn,Zn for irrigated alluvial soil with 100 m grid in 267 hm2 fields,the spatial variability patterns of these five soil trace elements were studied by traditional statistical and geo-statistical methods in Yibei Plain of Ningxia.The results indicated that Cu,Fe,Mn,Zn and B fitted normal and log-normal distribution respectively.The variation of available B,Mn,Fe,Zn and Cu was between 30.0% and 87.2%.Spatial structure of these trace elements was analyzed using semivariograms which were modeled in spherical models with ranges of 550,1 100,700,500,500 m for long-range and of 200,450,300,250,200 m for short-range.The ratios between sill and nugget are 14.3%,11.3%,23.0%,21.7%,23.1% which reveals the contents of B,Cu,Fe,Mn,Zn exhibited strong spatial autocorrelation respectively.Ordinary kriging was used to extrapolate point measurements across these fields.Cross-validation was used to compare the models.更多还原