基于地统计学的罗平烟区土壤主要养分丰缺评价

采用GPS定位技术,在云南罗平烟区采集土壤样品362个,运用地统计学和经典统计学方法,研究了植烟土壤主要养分的空间变异特征和丰缺格局。结果表明:罗平植烟土壤有机质和主要养分指标的块金效应为25%~75%,表现为中等的空间相关性,空间变异受结构性因素和随机性因素共同影响;土壤有机质均值为42.23g/kg,有52.27%的植烟土壤有机质含量超过40 g/kg;土壤全氮和速效氮均值分别为2.02 g/kg和161.96 mg/kg,分别有51.39%和79.84%的植烟土壤全氮和速效氮超过2 g/kg和150 mg/kg;土壤全磷和速效磷含量均值分别为1.63 g/kg和38.45 mg/kg,分别有11.00%和29.79%的植烟土壤全磷和速效磷含量超过2 g/kg和40 mg/kg;植烟土壤全钾含量均值为13.67 g/kg,有27.13%的植烟土壤全钾含量在12 g/kg以下,偏低;土壤速效钾均值为257.23mg/kg,有95.87%的植烟土壤速效钾含量在150 mg/kg以上。

Evaluation of soil main nutrients in tobacco field of Luoping county based on geo-statistics

Based on GPS technique, 362 tobacco soil samples were collected in Luoping, methods of geo-statistics and classical statistics were used to investigate the spatial variability and supplying availability of soil main nutrients in tobacco-growing field. The results indicate the nugget to sill ratio of soil organic and main nutrients in Luoping tobacco-growing field is 25%-75%, which is in the range of moderate spatial dependence. Spatial variability of those main nutrients was caused by structural and random factors. As the spatial distribution maps show, average content of soil organic matter is 42.23%, and the content of organic matter in 52.27% of the tobacco-growing soil was over 40 g/kg; average content of total N and available N were 2.02 g/kg and 161.96 mg/kg respectively, content of total N of 51.39% tobacco-growing soil was over 2 g/kg and available N content in 79.84% of tobacco-growing soil was above 150 mg/kg; average content of total P and available P were 1.63 g/kg and 38.45 mg/kg respectively, total P content in 11% of the tobacco-growing soil was above 2 g/kg and available P content in 29.79% of the tobacco-growing soil was above 40 mg/kg; content of total K was below 12 g/kg; average content of available K was 257.23 mg/kg, and available K content in 95.87% of the tobacco-growing soil was above 150 mg/kg.