摘要
采用地统计学和GIS技术,研究攀西植烟土壤有机质和全氮空间变异特征及其影响因素,为烤烟种植规划及平衡施肥提供依据。结果表明,研究区植烟土壤有机质和全氮含量变化范围分别为5.00～59.63g.kg-1和0.40～3.16g.kg-1,变异系数分别为38.66%和39.26%,均具有中等程度的空间变异性。半方差分析表明,土壤有机质的块金系数为0.578,具有中等程度的空间相关性,其空间变异性受土壤类型、地形条件等结构因素和施肥、管理水平等随机因素的共同影响;土壤全氮的块金系数为0.221,具有较强的空间相关性,其空间变异性受土壤类型、地形条件等结构因素的影响。空间插值结果得出,北部有机质含量高于南部,东部全氮含量则略高于西部;研究区内有24.57%的区域土壤有机质处于较低水平,39.72%的区域土壤全氮含量属于较丰富水平。不同县域应针对各自不同海拔和土壤类型的养分现状,合理调控有机肥和氮肥的施用。
This study was conducted to investigate the spatial distribution of soil organic matter and total nitrogen content and its influence factors, and provide a theory basis for management of fertilizing reasonably on tobacco. Soil samples were conducted by GIS and geostatistics in the tobacco region of Panxi, Sichuan Province. Results show that the concentrations of soil organic matter and total nitrogen content are moderate variability with the averages of 5.00 - 59.63 and 0.40 -3.16 g·kg^（-1）, and the variation coefficient are 38.66% and 39.26% , respectively. The nugget coefficient of the soil organic is 0. 578, and has moderate spatial correlation, suggesting they are co-affected by structural factors like soil type and relief. Meanwhile, the nugget coefficient of the total nitrogen is 0. 221, and it has a strong spatial correlation, indicating it is primarily controlled by structural factors like soil type and relief. Kriging interpolation map indicated that the soil organic matter showed an increasing trend from south to north, while total nitrogen showed an increasing trend from west to east. In addition, soil samples with organic matter in the most unsuitable range account for 24.57%, and total nitrogen content in the most suitable range account 39.72%. Scientific management should be adopted to manage organic and nitrogen fertilizer in soil according to the status of organic matter and total nitrogen content in different areas for elevations and soil types.
出处
《核农学报》
CAS
CSCD
北大核心
2013年第4期501-508,共8页
Journal of Nuclear Agricultural Sciences
基金
川渝中烟工业公司重点项目(10967)
攀枝花市烟草专卖局(公司)重点项目(201015)
中国烟草总公司四川省公司科技重点项目(201207
201208)
关键词
植烟土壤
空间分析
地统计学
有机质
全氮
Tobacco soil
Spatial variability
Geostatistics
Organic matter
Total nitrogen
