Abstract:

To explore the distribution characteristics of soil pH of cultivated land in Qinling-Bashan area, this study took Hanzhong City in Shaanxi Province as the research area, and analyzed the distribution law of soil pH in cultivated layer and its influencing factors by geostatistical and GIS methods. The results showed that the regional soil pH was between 4.15 to 8.41, with an average value of 6.50, and the overall soil was weakly acidic to neutral. The spatial distribution of soil pH showed the characteristics of low in the middle and high in the east and west. The distribution of soil pH in this area was affected by both structural factors and human factors. The results of geostatistical analysis showed that the optimal theoretical model of the soil pH variation was the exponential model, and the nugget effect value was 0.366, which indicated that the spatial heterogeneity of regional variables was the result of the joint action of random factors and structural factors, among which the soil type, farming system, soil parent material and altitude were the main influencing factors. This study could provide a theoretical basis for rational utilization of cultivated land and sustainable agricultural development.

Key words: Qinling-Bashan area, soil pH, distribution characteristics, influencing factors