Cokriging particle size fractions of the soil
Cokriging particle size fractions of the soil
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DOI：
10.1111/j.1365-2389.2006.00866.x
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发表时间：
2007-06
影响因子：
4.2
通讯作者：
R. Lark;T. Bishop
中科院分区：
文献类型：
--
作者：
R. Lark;T. Bishop
It is often necessary to predict the distribution of mineral particles in soil between size fractions, given observations at sample sites. Because the contents in each fraction necessarily sum to 100%, these values constitute a composition, which we may assume is drawn from a random compositional variate. Elements of a D‐component composition are subject to non‐stochastic constraints; they are constrained to lie on a D– 1 dimensional simplex. This means we cannot treat them as realizations of unbounded random variables such as the multivariate Gaussian. For this reason, there are theoretical reasons not to use ordinary cokriging (or ordinary kriging) to map particle size distributions. Despite this, the compositional constraints on data on particle size fractions are not always accounted for by soil scientists.
