Temporal stability of spatial patterns of soil water storage in a cultivated Vesuvian soil
Temporal stability of spatial patterns of soil water storage in a cultivated Vesuvian soil
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DOI：
10.1016/0016-7061(94)90042-6
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发表时间：
1994-03
期刊：
影响因子：
6.1
通讯作者：
V. Comegna;A. Basile
中科院分区：
文献类型：
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作者：
V. Comegna;A. Basile
在意大利Ponticelli（NA）的桑迪土壤上研究了土壤水储量的时空变异性。铝管安装在一块地（0.3公顷，种植大麦）150厘米深。用中子探针水分仪沿沿着垂直土壤剖面每隔15 cm测量含水量。利用变异函数分析了不同时期土壤贮水量的空间相关性。发现这些实验变差函数是相似的，并且可以使用组合变差函数。基于空间相关性，选择了具有足够空间分离的20个站点的网格，以使其不相关。从1986年11月至1987年4月，在六个不同的日期进行了测量。通过两种方法检验了土壤贮水量空间格局的时间稳定性：（1）通过对给定时间的贮水量值进行排序并比较站点的排序;（2）通过分析不同时间的贮水量值之间的秩相关性。利用点克立格法绘制了土壤贮水量等值线图，并证明了某些测点连续出现贮水量极值。然而，由于土壤的极端同质性，无法确定代表平均田间储水量的有限地点。因此，这种方法提供了更好的可能性，更异质的土壤。相关性分析表明，只有一个中等损失的信息在等级顺序的水平在生长季节。
Spatial and temporal variability of soil water storage were studied on a sandy soil in Ponticelli (NA), Italy. Aluminium tubes were installed in a plot (0.3 ha and cultivated with barley) at a depth of 150 cm. A neutron probe moisture meter was used to measure the water content at intervals of 15 cm along the vertical soil profiles. The spatial dependence of the soil water storage along a 50 m transect was examined by variograms at different times. These experimental variograms were found to be similar and a combined variogram could be used. On the basis of the spatial correlation a grid of 20 sites were selected with sufficient spatial separation to be uncorrelated. Measurements were performed from November 1986 to April 1987 at six different dates. The temporal stability of spatial patterns of soil water storage was tested in two ways: (1) by ranking the storage values for a given time and comparing the ranks of the sites; (2) by analyzing the rank correlations between storage values at different times. Moreover, contour maps of soil water storage were drawn by punctual kriging.It has been demonstrated that some measuring locations show extreme values of water storage continuously. However, it was not possible to identify a limited number of locations representative of the average field water storage, due to the extreme homogeneity of the soil. Therefore this method offers better possibilities with more heterogeneous soils. Correlation analysis showed only a moderate loss of information at rank-order level during the growing season.