摘要
利用地统计学和模糊c-均值聚类算法,对贵州省黔南州山地植烟土壤主要养分的空间变异特征和管理分区进行研究.结果表明:研究区土壤有机质含量适中,碱解氮、有效磷和速效钾含量丰富;4种土壤养分都具有中等强度变异,服从对数正态分布;有机质与碱解氮、有效磷与速效钾含量呈中度相关.土壤有机质和碱解氮的半方差函数为高斯模型,有效磷和速效钾为指数模型;4种土壤养分都具有中等的空间自相关性,滞后距离差异较大.研究区绝大部分土壤有机质、碱解氮、有效磷和速效钾含量处于适中至很丰富水平,含量缺乏的面积比例分别为0.93%、0.53%、0.24%和7.91%.研究区可划分为2个管理分区,分区1和分区2的面积比例分别为69.8%和30.2%,分区1土壤有机质、碱解氮、有效磷和速效钾含量极显著低于分区2.
Spatial variability and management zone of soil major nutrients in tobacco fields in Qian- nan mountainous region were analyzed using geostatistics and fuzzy c-mean algorithm. Results indi- cated that the level of soil organic matter （OM） was moderate, and alkalytic nitrogen （ AN）, avai- lable phosphorus （AP） and available potassium （AK） were rich according to tobacco soil nutrient classification standards. Coefficients of variation （CV） of OM, AN, AP and AK were moderate. Contents of OM, AN, AP and AK fitted log-normal distributions. Correlation analysis showed moderate correlations between OM and AN, AP and AK. OM and AN were best described by Gaussian semivariogram models, while AP and AK were described by exponential models. The four nutrients displayed moderate spatial autocorrelation. There were significant differences among lag distances of four soil nutrients. OM, AN, AP and AK in the majority of studied regions varied at moderate to very rich levels, and deficiencies of OM, AN, AP and AK only accounted for 0.93% , 0.53%, 0.24% and 7.91% of the total studied region, respectively. Based on the results, the studied region was divided into two management zones （MZ） , namely MZ1 and MZ2, accounting for 69.8% and 30.2% of the studied region respectively. The soil levels of OM, AN, AP and AK in MZ1 were significantly lower than those in MZ2 （P〈0.01）.
出处
《应用生态学报》
CAS
CSCD
北大核心
2014年第6期1701-1707,共7页
Chinese Journal of Applied Ecology
基金
黔南山地烤烟专用肥区域配方及施肥技术研究项目(201130)
安徽农业大学稳定和引进人才科研项目
安徽农业大学农学院科研启动基金项目(2011003)资助
关键词
烟田
土壤养分
空间变异
管理分区
tobacco field
soil nutrient
spatial variability
management zone.
