Study on spatial distribution of soil available sulfur and its influencing factors in farmland of Xi'an city
In order to study the spatial distribution and influencing factors of soil available sulfur in farmland of Xi'an city,soil sample(0-20 cm)was collected from various counties in Xi'an city in 2020,the parent material,geomorphic type,soil type and altitude information of the sampling points were investigated,and the available sulfur,organic matter,pH value,total nitrogen,available phosphorus and available potassium of the soil were measured.Finally,509 samples were retained after excluding data outliers.Descriptive statistics,correlation analysis,variance analysis,multiple comparison and geographic information system were used to study the spatial variation of soil available sulfur and its influencing factors,providing data support for the regional management of soil sulfur and rational fertilization in Xi'an city.The results showed that the average value of soil available sulfur content in Xi'an agricultural areas was 21.03 mg/kg,which belonged to the medium level according to the classification standard of soil available sulfur content,and the coefficient of variation reached 81.09%,which belonged to the medium variation.Soil available sulfur content showed obvious spatial differentiation from west to east,showing a trend of"high-low-high-low".The total soil area of low and medium-low sulfur contents accounted for 56.8%.Soil type,parent material and geomorphic type all had significant effects on soil available sulfur content,among which the parent material had the most significant effect.Soil available sulfur content had significant negative correlations with pH value,and had significant positive correlations with soil organic matter and total nitrogen.On account of soil sulfur deficiency in some agricultural areas,sulfur compound fertilizer or supplemental sulfur fertilizer was recommended to reduce the risk of sulfur deficiency in crops.
soil available sulfurspatial distributioninfluencing factors
NETL
NSTL
万方数据
