淮北平原砂姜黑土玉米产量与土壤性质的区域分析

以淮北平原作为调查区域,对砂姜黑土区48个样点的玉米产量及0～20 cm耕层土壤性质进行了分析.结果表明:在涡阳县东、西部,蒙城县南部和怀远县北部,玉米产量多在8.7 t/hm2以上,土壤容重较小;而在蒙城县北部,玉米产量多在7t/hm2以下,土壤容重最大,平均达到1.6 g/cm3以上.涡阳县土壤有机碳含量最高,平均...

Regional Analysis of Maize Yield and Physiochemical Properties of Shajiang Black Soil (Vertisol) in Huaibei Plain

In this study, taking Mengcheng County, Huaiyuan County and Guoyang County of Huaibei Plain as investigation areas, the maize yield and 0-20 cm topsoil properties of 48 sample sites in Shajiang black soil area were analyzed. The results show that in the east and west of Guoyang County, the south of Mengcheng County and the north of Huaiyuan County, the maize yield is more than 9 t/hm_², and the soil bulk density in these areas is small. In the north of Mengcheng County, the yield of maize is less than 6.75 t/hm_², and the soil bulk density is the highest, with an average of more than 1.6 g/cm_³. The content of soil organic carbon in Guoyang County is the highest, with an average of 15.4 g/kg, which is 28.8% and 55.8% higher than that in Huaiyuan County and Mengcheng County, respectively. The total soil nutrients (total nitrogen, total phosphorus and total potassium) do not change significantly with the yield grade of maize. The correlation analysis shows that maize yield is negatively correlated with soil penetration resistance (r = -0.348, P < 0.05) and soil bulk density (r = -0.484, P < 0.01). It is positively correlated with soil organic carbon (r = 0.421, P < 0.01). Therefore, this study shows that soil physical properties and soil organic carbon are the key limiting factors affecting maize yield in this area.