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结合地统计与GIS技术研究潜江市土壤养分的空间分布特征及其影响因素,结果表明:潜江市土壤养分呈西高东低的格局,按照全国第2次土壤普查的土壤养分分级标准评估,发现潜江市有机质低于20 g kg-1的土壤占21.4%,碱解氮低于90 mg kg-1的土壤占24.9%,有效磷低于10 mg kg-1土壤占18.5%,速效钾低于100 mg kg-1的土壤占0.3%。其余部分土壤处于中等丰富状况,其中速效钾大于100 mg kg-1的土壤占到99.7%,说明潜江市不缺速效钾。定量分析水系密集区和水系稀疏区土壤养分含量,发现水系密集区土壤养分平均含量高于水系稀疏区土壤养分平均含量,有机质高1.36 g kg-1、碱解氮高10.13 mg kg-1、有效磷高0.32 mg kg-1、速效钾6.62 mg kg-1。方差分析发现,水系密集区和水系稀疏区土壤养分含量存在显著差异,说明水系对土壤养分的空间分布具有重要影响,对解释水系密集区土壤养分沿水系成带状分布具有重要价值。
According to the statistics and GIS technology, the spatial distribution of soil nutrients and its influencing factors in Qianjiang were studied. The results showed that the soil nutrients in Qianjiang presented a pattern of high west and low east. According to the soil nutrient classification standard assessment of the 2nd national soil survey, Found that Qianjiang City, organic matter below 20 g kg-1 of the soil accounted for 21.4%, alkali hydrolysis nitrogen is less than 90 mg kg-1 of the soil accounted for 24.9%, available phosphorus less than 10 mg kg-1 soil accounted for 18.5%, available potassium Soil below 100 mg kg-1 accounted for 0.3%. The remaining part of the soil is in a moderately rich condition, of which more than 100 mg kg-1 of available-K soil accounts for 99.7%, indicating no shortage of available potassium in Qianjiang. Quantitative analysis of soil nutrient content in water-intensive and water-based sparse area, found that the average concentration of soil nutrients in dense water system was higher than that in the water sparse area. The organic matter content was 1.36 g kg-1 and the available nitrogen was 10.13 mg kg-1 Phosphorus 0.32 mg kg-1, available potassium 6.62 mg kg-1. Analysis of variance showed that there was a significant difference in soil nutrient contents between water-intensive areas and water-based sparse areas, indicating that water systems have an important influence on the spatial distribution of soil nutrients. It is of great value to explain the distribution of soil nutrients in water-intensive areas.