[Study on spatial distribution pattern and seasonal distribution of Buthus martensii in yan'an].

Objective: To study population dynamics of Buthus martensii and its wild spatial distribution pattern in Yan'an. Methods: Every month,the 1st,10th and 20th day were designated to collect Buthus martensii samples and count on the collection by using expansion pattern target,Taylor power law and Lwao m-x regression analysis. Results: Taylor power law regression equation was lg S2= 1. 6671 lg +0. 1554; Lwao m- regression equation was m =1. 3179 +1. 5133. The spatial distribution pattern of Buthus martensii was negative binomial distribution and its population fluctuation curve in the wild presented a single peak. Conclusion: Spatial pattern of Buthus martensii in Yan'an is aggregated distribution which based on individual group,and the higher density,the greater aggregation degree.