SIMULATION OF PARTIAL ANAEROBIOSIS IN A MODEL SOIL IN RESPECT TO DENITRIFICATION
SIMULATION OF PARTIAL ANAEROBIOSIS IN A MODEL SOIL IN RESPECT TO DENITRIFICATION
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模型土壤中关于反硝化的部分厌氧模拟
DOI：
10.1097/00010694-197908000-00008
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
P. Leffelaar
中科院分区：
文献类型：
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作者：
P. Leffelaar
采用计算机模拟的方法，研究了影响土壤厌氧的因素。这种模式化的几何结构表明，可以区分出两种不同类型的孔隙：簇内孔隙和簇间孔隙。用一般术语计算了集料间水分和集料非水覆盖区域（即所谓的空气暴露区域）的水分特征。结果提供了一种工具来推导一定聚合半径下的曲线。团粒间含水量用于计算模型土壤沿剖面向下的扩散特性。从团聚体间孔隙向团聚体的扩散与团聚体暴露在空气中的面积成正比。给出了聚集体半径为0.5 cm时的模型计算结果。它们表明厌氧作用分别发生在10厘米以下深度和整个剖面中，分别发生在降雨前和降雨期间。厌氧土壤体积对阵雨迅速作出反应。然而，它不像呼吸活动的大小和分布或聚集体中的扩散系数那样受到水状况的严重影响。模型土壤也被用来推导，在一个特定的情况下，土壤厌氧特性的土壤吸湿与厌氧土壤分数。对进一步的实验研究提出了一些建议。
Factors affecting anaerobiosis in soil have been studied by means of computer simulation applied to a model soil composed of spherical aggregates in a hexagonal packing. This schematized geometry implies that two different types of pores are distinguished: intra- and interaggregate pores. The moisture characteristics for the interaggregate water and the non-water-covered area of the aggregates, the so-called air-exposed area, were calculated in general terms. The results give a tool to derive curves for a certain aggregate radius. The interaggregate water content is used to calculate the diffusion properties of the model soil down the profile. The diffusion from interaggregate pores into the aggregates is taken proportional to the air-exposed area of the aggregates. Results of the model are given for an aggregate radius of 0.5 centimeters. They indicate anaerobiosis to occur below a depth of 10 centimeters and in the profile as a whole, before and during rainfall, respectively. The anaerobic soil volume rapidly responds to a shower of rain. However, it is not affected as seriously by the water regime as it is by the magnitude and distribution of the respiratory activity or the diffusion coefficient in the aggregates. The model soil was also used to derive, for a particular case, a soil anaerobiosis characteristic relating soil moisture suction to the anaerobic soil fraction. Some indications are given for further experimental research.