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首页> 外文期刊>Soil Science Society of America Journal >Use of Bayesian Methods to Model Soil Aggregation in Undisturbed Semiarid Grasslands
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Use of Bayesian Methods to Model Soil Aggregation in Undisturbed Semiarid Grasslands

机译：贝叶斯方法在原状半干旱草原土壤聚集模型中的应用

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Comparisons of soil aggregation and aggregate-protected organic matter among soil textures in the same climatic zone and of the same mineralogical composition are somewhat limited. Two undisturbed, semiarid sites in northeastern Wyoming were selected to determine the differences in aggregation and organic matter between loam and sandy clay loam soils. Additionally, data from these two sites were used to illustrate differences between two statistical approaches to data analysis: Bayesian modeling in the context of a two-sample comparison of means and conventional t-tests. Examination of posterior distributions (Bayesian modeling) and confidence intervals (conventional t-tests) resulted in similar conclusions about the influence of soil texture on aggregation and C and N concentrations. Loam soils generally had more structure (as indicated by higher macroaggregation) and aggregate-protected C and N than sandy clay loam soils, which had greater amounts of available C and N not protected by aggregates. For soils in undisturbed semiarid grasslands with similar clay contents, in the range of 11 to 24%, we suspect that aggregate stability was primarily affected by sand content, while aggregate C and N accumulations were influenced by silt. A higher percentage of silt in the loam soils appeared to have provided enough of a difference in small pore space between the two soil types to result in higher C and N storage in loam soils relative to sandy clay loam soils. Soil texture is a major driving force behind aggregation as well as C and N storage in semiarid soils of the same mineralogy.
机译：在同一气候区和相同矿物学组成的土壤质地之间，土壤聚集和受聚集保护的有机物的比较受到一定限制。在怀俄明州东北部选择了两个 半干旱的地点，以确定壤土和砂质壤土之间的团聚体和有机质 的差异。此外，来自 这两个站点的数据用于说明 两种数据分析统计方法之间的差异：贝叶斯建模 均值检验和常规 t检验的样本比较。后验分布（贝叶斯模型） 和置信区间（常规t检验）得出关于土壤质地对聚集的影响的相似结论 和碳和氮浓度。壤土通常比砂质壤土具有更多的结构 （如较高的宏观聚集度所示）和受集料保护的 C和N，后者的含量更多。 >不受聚合保护的可用C和N。对于黏土含量相似的未扰动半干旱草原的土壤 ， 在11％到24％的范围内，我们怀疑总体稳定性 主要受以下因素影响：含沙量，而总C和 N积累受淤泥影响。壤土中较高比例的 似乎提供了足够的 两种土壤类型 之间的小孔隙空间差异，从而导致相对于 沙质壤土壤土，壤土中较高的碳和氮存储量。土壤质地是聚集作用以及同一矿物学的半干旱土壤中碳和氮的主要驱动力。

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    《Soil Science Society of America Journal》 |2009年第5期|1707-1714|共8页
  • 作者

    Abbey F. Wick; Snehalata V. Huzurbazar; Peter D. Stahl;

  • 作者单位

    Dep. of Crop and Soil Environ. Sciences, Smyth Hall, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061,Dep. of Renewable Resources, Univ. of Wyoming, 1000 E. University Ave., Laramie, WY 82071;

    Dep. of Statistics, Univ. of Wyoming, 1000 E. University Ave., Laramie, WY 82071,Dep. of Renewable Resources, Univ. of Wyoming, 1000 E. University Ave., Laramie, WY 82071;

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