Study on fractal property of Nilapravata lugens(BPH) occurrence
褐飞虱(Nilaparvata lugens)发生的分形性质研究

The nature of BPH occurrence was investigated by means of fractal theory based on the systematic field investigation data of BPH occurrence.The results indicated:(1)BPH occurrence had a fractal property in fixed scale interval with the D value 0 7158,0 5212,0 2816 respectively.(2)The fractal dimension value of BPH occurrence was a new paramater expressing the distinction of occurrence degree in fixed scale interval,and the greater the fractal dimension value,the lighter the BPH occurance,and vice versa.(3)As D value showed a close correlation with aggregation degree,it could be used as an index for aggregation degree.(4) BPH occurrence possessed multifractal structure,and the related D q curve may have an application in the forecast of BPH occurrence.