A comparison between three legacy soil maps of Zambia at national scale: The spatial patterns of legend units and their relation to soil properties
A comparison between three legacy soil maps of Zambia at national scale: The spatial patterns of legend units and their relation to soil properties
复制标题
赞比亚国家尺度的三幅遗留土壤图的比较：图例单位的空间模式及其与土壤特性的关系
DOI：
10.1016/j.geoderma.2021.115193
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发表时间：
2021
期刊：
影响因子：
6.1
通讯作者：
Mukumbuta I
中科院分区：
文献类型：
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作者：
Mukumbuta I
我们研究了赞比亚的三张土壤图，其中两张是1：100万比例尺的赞比亚土壤勘探图（ESMZ）和特拉普内尔及其同事于1947年制作的植被-土壤图，另一张是1：300万比例尺的非洲土壤地图集（SAA）。我们估计的方差分量的测量粘土，沙子和有机碳含量和土壤的容重在全国各地使用的模型，其中包括不同的平均值土壤图单位作为随机效应。除了有机碳含量外，所有地图都存在显著差异，这是由于两张地图的图例单位之间存在差异所致，ESMZ的图例单位分别基于粮农组织-教科文组织，SAA的图例单位分别基于世界参考基准。这是尽管他们的地图规模小。对于植被-土壤图，我们研究了广泛的土壤自然地理单元之间的差异。这些并不能解释土壤性质的显著变化。土壤-植被图的土壤自然地理单元与欧洲安全和稳定区图例单元所分组的更广泛的自然地理单元之间有明显的相似之处。土壤单元的空间格局的SAA是最空间异质性，作为衡量的指标变异函数的总和，尽管在最小的出版规模。很明显，土壤植被图中最大的自然地理单元高原土壤中的一些土壤变化，如SAA的地图单元所示，与1947年绘制的不同植被单元显著相关。这些研究表明，对遗留土壤信息的定量评估可以帮助我们了解其潜力和局限性。
We examined three soil maps of Zambia, two published at scales of 1:1 million – the Exploratory Soil Map of Zambia (ESMZ) and the Vegetation–Soil Map produced by Trapnell and colleagues in 1947 – and one at 1:3 million, the Soil Atlas of Africa (SAA). We estimated components of variance for measurements of clay, sand and organic carbon content and bulk density of the soil across the country using models which included different mean values for soil map units as random effects. For all but organic carbon content there was significant variation accounted for by differences between legend units for two of the maps, ESMZ with legend units based on the FAO-Unesco and SAA with legend units based on the World Reference Base respectively. This was despite their small cartographic scale. For the Vegetation–Soil Map, we examined differences between broad soil physiographic units. These did not account for significant variation in the soil properties. There were clear similarities between the soil physiographic units of the Soil–Vegetation Map and broader physiographic units into which the legend units of the ESMZ are grouped. The spatial pattern of soil units of the SAA was the most spatially heterogeneous, as measured by the sum of indicator variograms, despite being at the smallest published scale. It was apparent that some of the soil variation within the largest physiographic unit of the Soil–Vegetation Map, the Plateau Soils, as expressed by the map units of the SAA was significantly associated with the different vegetation units mapped in 1947. These studies show how quantitative assessment of legacy soil information may help us understand its potential and limitations.