摘要
基于2 500 m×2 500 m规则网格在江苏省沛县全县范围内采集土壤样品212个,研究了土壤全氮空间变异性,并在此基础上对揭示该县全氮空间变异性所需合理采样点数量进行了估算。研究结果表明,该县全氮平均含量为0.96 g/kg,其4个主要土壤类型中,淤土的全氮含量最高,轻盐碱土含量最低,分别为1.08 g/kg、0.81g/kg,而沙土和两合土居于两者之间;从空间分布来看,该县中东部和西北部地区全氮含量较高,而西南部和北部地区含量较低;在5%、10%和15%三种设定误差等级及95%和90%两个置信水平上,估算全县土壤全氮变异性所需的合理采样点数量分别为152、38、17和107、27、12。本研究结果可为区域土壤调查方案的制定提供参考。
On the basis of regular grids of 2 500 m×2 5 0 0 m,2 1 2 soil samples were collected throughout Peixian county of Jiangsu province,and the soil total nitrogen （ TN） variability was analyzed and the reasonable sampling size was estimated in the study area. The results showed that the mean value of TN in Peixian county was 0. 96 g/kg. Among the four main soil genuses,miry soil had the largest TN content （1. 08 g/kg）,light saline soil had the least content （0. 81 g/kg）, and the contents of sandy soil and mixed soil were in between. The mid-east and northwest region had higher TN content,while the southwest and north region had lower TN content. At two confidence levels of 95% and 90%,the reasonable sam-pling sizes of TN were 152,38,17 a nd 1 0 7,2 7,12 with three estimated error levels of 5% ,1 0 % a nd 1 5 % respectively.The results is valuables for making regional soil survey plans.
出处
《江苏农业学报》
CSCD
北大核心
2016年第4期798-802,共5页
Jiangsu Journal of Agricultural Sciences
基金
国家自然科学基金项目(41201213
41571206)
土壤与农业可持续发展国家重点实验室项目(Y20160008)
江苏省高等学校大学生创新创业训练计划重点项目(201410320036Z)
关键词
土壤全氮
空间变异
合理采样点数量
县域尺度
soil total nitrogen
spatial variability
reasonable sampling size
county scale
