结果表明，研究区土壤砷为正偏态分布，经高斯非线性转化后，符合二阶平稳假设。

The soil as of the study area was positive skew distribution, tally with second steps stable supposed, after Gaussian non-liner change.

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证明了该模型的二阶特性与一个线性平稳arma模型相似，最后给出了该模型的最优化线性预报方法。

It is shown that the second order structure is similar to a linear ARMA model with uncorrelated errors. In the end, the best linear predictors are given for USDBL models.

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