黑龙江食品安全示范区农田土壤养分空间变异研究

以面积为450000m2农田为采样区,使用手持式GPS定位,网格法采集0￣20cm耕层土壤样品,实验室测定土壤碱解氮、速效磷、速效钾和有机质的含量。应用传统统计学方法和空间分析方法对土壤养分变异进行了研究。结果表明,土壤养分性质均存在着空间变异性,受常规施肥措施影响较大的碱解氮、速效磷、速效钾变异相对较大;常规施肥有机质投放较少,变异相对较小;土壤养分性质均存在半方差结构,分别拟合Circular、Pentaspherical、Exponential模型,碱解氮、速效磷、速效钾和有机质均显示中等的空间相关性。

Study on Spatial Variability of Soil Nutrients in the Food Safety Demonstration Plot of Heilongjiang

Observing points by grid were made in field 450000 m2 and adopted method of GPS orientation. Soil samples were obtained under land of 0~20cm. N, P, K and Organic matter were measured in laboratory. Soil variability was studied with routine statistics method and spatial analysis method. The result showed that there existed spatial variability of soil nutrients. N, P and K had medium variability, which were mainly affected by routine fertilization measures. On the contrary, Organic matter has a smaller spatial variability; Soil nutrient had semi-variance structure, and model best fit included Circular, Pentaspherical and Exponential. There existed medium spatial correlation in N, P, K and OM.