褐土区乡镇级农田土壤养分时空变异研究

充分了解土壤养分的时空变异特性,结合施肥现状针对性地调节养分供应、合理施肥是提高养分资源利用效率的途径之一,也是促进精准农业快速发展的重要基础。利用经典统计学与地统计学相结合的方法,对寿阳县宗艾镇的土壤养分进行了跨度10年的时空变异分析,结果表明,从空间变异方面来说,速效钾2008年、有效磷2008年、有机质1998年都有强烈的空间变异,有机质2008年、全氮2008年、全氮1998年、速效钾1998年为中等空间变异,有效磷1998年具有弱的空间自相关性。从时间变异方面来说,1998—2008年之间,土壤有机质的平均含量下降了2.06g/kg,而土壤全氮的平均含量则增加了0.07g/kg。土壤有机质含量为20.1～30.0g/kg的面积减少了10.45%;土壤全氮含量为0.76～1.00g/kg的面积增加了11.9%;土壤速效钾含量为100～150mg/kg的面积增加了15.6%;土壤有效磷含量为5.1～10.0mg/kg的面积增加了23%。有机质、全氮、速效钾在时间上表现为中等稳定性,有效磷在时间上表现为不稳定性。

Temporal and Spatial Variation of Soil Nutrient Research on Cinnamon Soil in Town Region

For full understanding of the characteristics of spatial and temporal variability of soil nutrient and adjusting the nutrient supply and rational use of fertilizer nutrients based on the present fertilizer application is one way to improve the efficiency of resource use and to promote precision agriculture which is an important foundation for rapid development. In this paper, the classical statistical geostatistical methods were carried out for analyzing soil nutrients' decade spatio-temporal variability in Zongai Town .The result are as follows: In the aspect of spatial variability ,available kalium 2008 year, available phosphorus 2008 year, organic matter 1998 year, had strong spatial variability; organic matter 2008 year , total nitrogen 2008 year, total nitrogen 1998 year, available kalium 1998 year showed middle-class spatial variability; available phosphorus 1998 year had weak spatial autocorrelation. In the aspect of temporal variability from 1998 year to 2008 year soil organic matter average content decreases by 2.06 g/kg, while total nitrogen average content in soil increased by 0.07 g/kg. Soil OM content in the 20.1～30.0 g/kg range of the region reduces by 10.45 % ; the area of soil TN content in the range of 0.76～1.00 g/kg increases by 11.9%; the area of the AVK content in the range of 100～150 mg/kg increases by 15.6 % ; the area of AVP content in the range of 5.1～10.0 mg/kg increases by 23.0%. The soil OM, TN, AVK is generally the middle-class of temporal variations stability, while AVP is generally the middle-class of temporal variations instability.