The Representative Soil Sampling Scheme of England and Wales: the spatial variation of topsoil nutrient status and pH between 1971 and 2001
The Representative Soil Sampling Scheme of England and Wales: the spatial variation of topsoil nutrient status and pH between 1971 and 2001
复制标题
DOI：
10.1111/j.1475-2743.2006.00047.x
复制
发表时间：
2006-12-01
影响因子：
3.8
通讯作者：
Archer, J. R.
中科院分区：
文献类型：
--
作者：
Baxter, S. J.;Oliver, M. A.;Archer, J. R.
自1969年以来，代表性土壤采样计划（RSSS）一直在监测英格兰和威尔士的农业用地土壤。在这里，我们描述了使用地质统计学对这些调查数据进行的第一次空间分析。选取了四年（1971年、1981年、1991年和2001年）的数据来检验土壤的养分（有效钾、镁和磷）和pH值状况。在每个农场，对四块田地进行取样；但是，在较早的年份，只有农场的坐标可用，而不是每个田地的坐标。每个农场的平均数据用于空间分析，变异图显示了即使样本量较小的空间结构。这些变异图合理地概括了从更密集取样的国家土壤清单数据中确定的更大规模的变异。克里格预测的K值图通常显示，随着时间的推移，中部和东南部地区的值较大（超过200毫克升（-1）），西部地区的值有所增加，而mg值则相当稳定。克里格预测的P值随着时间的推移而下降，尤其是在东部，而pH值则随着时间的推移而增加。使用析取克里金来检查可用P的时间变化，使用概率小于该元素的给定阈值。RSSS不是为空间分析而设计的，但结果表明，这些调查的数据适合于这一目的。空间分析结果与统计分析结果共同提供了RSSS数据库作为土壤监测基础的全面视图。在设计未来的国家土壤监测方案时，应考虑到这些数据。
The Representative Soil Sampling Scheme (RSSS) has monitored the soil of agricultural land in England and Wales since 1969. Here we describe the first spatial analysis of the data from these surveys using geostatistics. Four years of data (1971, 1981, 1991 and 2001) were chosen to examine the nutrient (available K, Mg and P) and pH status of the soil. At each farm, four fields were sampled; however, for the earlier years, coordinates were available for the farm only and not for each field. The averaged data for each farm were used for spatial analysis and the variograms showed spatial structure even with the smaller sample size. These variograms provide a reasonable summary of the larger scale of variation identified from the data of the more intensively sampled National Soil Inventory. Maps of kriged predictions of K generally show larger values in the central and southeastern areas (above 200 mg L(-1)) and an increase in values in the west over time, whereas Mg is fairly stable over time. The kriged predictions of P show a decline over time, particularly in the east, and those of pH show an increase in the east over time. Disjunctive kriging was used to examine temporal changes in available P using probabilities less than given thresholds of this element. The RSSS was not designed for spatial analysis, but the results show that the data from these surveys are suitable for this purpose. The results of the spatial analysis, together with those of the statistical analyses, provide a comprehensive view of the RSSS database as a basis for monitoring the soil. These data should be taken into account when future national soil monitoring schemes are designed.