湖南龙山县植烟土壤交换性钙镁的空间分布及影响因素

应用GPS定位技术在湖南省龙山县采集具代表性植烟土壤300份,分析土壤交换性钙、镁含量和钙镁比的空间分布特征。结果表明:龙山县植烟土壤交换性钙平均含量为7.95 cmol/kg,变幅为0.25~25.62 cmol/kg,有30.14%的土样在适宜范围(6.00~10.00 cmol/kg);交换性镁平均含量为1.68 cmol/kg,变幅为0.02~5.74 cmol/kg,仅有15.38%的土样在适宜范围(1.00~1.50 cmol/kg);钙镁比平均值为7.63,变幅为1.99~84.76,有25.34%的土样在适宜范围(5~10)。土壤交换性钙含量受海拔高度、p H、土壤母质和质地影响极显著,受地形影响显著;交换性镁含量受海拔高度、p H、地形、土壤母质和质地极显著影响;钙镁比受海拔高度影响极显著,受地形显著影响。

Spatial distribution of exchangeable calcium and magnesium contents of tobacco-growing soil in Longshan and its influencing factors

To study the spatial distribution characteristics of exchangeable calcium (Ca) and magnesium (Mg) contents of tobacco–growing soil in Longshan and its influencing factors. Using the technology of global positioning system (GPS), 300 representative soil samples from Longshan were collected to analyze the spatial distribution of soil exchangeable Ca, Mg contents and Ca/Mg ratios, as well as their influencing factors. The results were as follows: The average content of exchangeable calcium in soil was 7.95 cmol/kg ranging from 0.25 to 25.62 cmol/kg, and exchangeable calcium contents in 30.14% of the soil samples were in the appropriate level (6.00–10.00 cmol/kg); the average content of exchangeable magnesium in soil was 1.68 cmol/kg ranging from 0.02 to 5.74 cmol/kg, and exchangeable magnesium contents in only 15.38% of the soil samples were in the appropriate level (1.00–11.50 cmol/kg); the average value of Ca/Mg ratios was 7.63 ranging from1.99 to 84.76, and Ca/Mg ratios in 25.34% of the soil samples of were in the appropriate level (5–10). The exchangeable calcium content in soil was extremely significantly influenced by altitude, pH, soil parent material and soil texture, and significantly influenced by terrain. The content of exchangeable magnesium in soil was extremely significantly influenced by altitude, pH, terrain, soil parent material and soil texture. Ca/Mg ratios was extremely significantly influenced by altitude, and significantly influenced by terrain.