| 安顺市土壤pH空间变异及影响因素分析 |
| 摘要点击 1688 全文点击 595 投稿时间：2021-08-12 修订日期：2021-09-25 |
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| 中文关键词 土壤pH 空间分异 空间分布 环境因子 安顺市 |
| 英文关键词 soil pH spatial differentiation space distribution environmental factor Anshun City |
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| 中文摘要 |
| 探究土壤pH的空间分布特征及其变异规律，分析环境因子对土壤pH空间分异的影响，对安顺市山地复杂环境下土壤pH的精准管理和土壤资源的可持续利用具有重要意义.基于22851个野外采样点，综合采用全局Moran's I指数、冷热点分析、半方差函数和克里金插值的方法，从不同角度揭示了安顺市土壤pH值的空间结构特征和分布规律，并借助地理探测器分析了环境因子对其空间分异的影响.结果表明：①安顺市表层土壤pH值的变化范围在3.56~8.61之间，均值为6.28，变异系数为16.33%，具有中等程度的空间变异性；②土壤pH在全局空间上呈聚集分布，在局部空间上以西部和西北部地区为热点聚集区，而东部和南部则为冷点聚集区；块金系数（40.19%）表明，土壤pH在空间上的这种变异性是由结构性因素和随机因素共同决定的，但结构性因素的作用更大；③在空间分布上，土壤pH主要呈现斑块状的镶嵌分布格局，其中弱酸性土（57.14%）集中分布在安顺市的东部、东北部和南部地区，中性土（30.13%）以西部、西北部和东南部较为集中，强酸性土（6.12%）和碱性土（6.45%）则以块状结构分别镶嵌于弱酸性土和中性土之中.④地理探测器分析表明各环境因子对土壤pH空间变异的解释力由大到小依次为：土壤类型（9.4%）>成土母岩（7.9%）>海拔（2.1%）>土地利用（1.8%）>坡度（0.1%），并且土壤类型和成土母岩与其它各因子交互作用的q值均较大，因此土壤类型和成土母岩是引起安顺市土壤pH空间变异的主控因子. |
| 英文摘要 |
| Exploring the spatial distribution characteristics and variation law of soil pH and analyzing the impact of environmental factors on the spatial differentiation of soil pH are of great significance to the accurate management of soil pH and the sustainable utilization of soil resources in the complex mountainous environment of Anshun City. Based on 22 851 field sampling points, using the methods of global Moran's I index, cold and hot spot analysis, semi-variance function, and Kriging interpolation, the spatial structure characteristics and distribution law of soil pH in Anshun City were revealed from different angles, and the influence of environmental factors on its spatial differentiation was analyzed with the help of geographic detectors. The results showed that:① the variation range of topsoil pH value in Anshun City was 3.56-8.61, the mean value was 6.28, and the coefficient of variation was 16.33%. ② In the global space, soil pH showed aggregation distribution; in the local space, the west and northwest were hot spots, whereas the east and south were cold spots. The nugget coefficient (40.19%) showed that the spatial variability in soil pH was determined by both structural and random factors, but the role of structural factors was greater. ③ In terms of spatial distribution, soil pH mainly presented a patchy mosaic distribution pattern, in which slightly acidic soil (57.14%) was concentrated in the east, northeast, and south of Anshun City; neutral soil (30.13%) was concentrated in the west, northwest, and southeast; and strongly acidic soil (6.12%) and alkaline soil (6.45%) were embedded in slightly acidic soil and neutral soil, respectively, in a block structure. ④ The geo-detector analysis showed that the explanatory power of various environmental factors to the spatial variation in soil pH was ranked as soil type (9.4%)>soil forming parent rock (7.9%)>altitude (2.1%)>land use (1.8%)>slope (0.1%), in which the q value of the interaction between soil type and parent rock type and other factors was large. Therefore, soil type and parent rock type were the main controlling factors of soil pH spatial variation in Anshun City. |
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