七个气象因子对海南山蛭种群数量动态影响八年观测研究

在海南岛五指山腹地橡胶林中系统观测海南山蛭种群数量变动8年．对海南山蛭种群数量Y与气候因素X_(1-n)的关系建立逐步最优回归方程Y=b_0 b_1X_1 b_2X_2 …… b_nX_n计算分析采用国际标准化最新版本SAS(6.11)软件进行分析．逐步回归分析表明：1）每年海南山蛭种群数量变动不同，影响其数量变动主要因素是X_1，X_2和X_3.2）雨季（5～10月）种群数量明显大，其主要影响因素是X_1，X_2和X_5，旱季（11月～次年4月）种群数量小，其主要影响因素是X_1.3）8年19条回归方程，7个气象因素中影响种群数量变动的主要气象因素是X_1，X_2和X_5，X_7，与山蛭生物学特性一致，本研究结果为山蛭防治提供科依据．

An Investigation on Effect of Seven Meterological Phenomena Factors on Population Dynimic of Leech (Haemadipsa Hainana)for Eitht Years

The investigation of population number change of Haemadipsa hainana has been made in rubber plantation of Hainana Island for eight years.The relationship between the popula-tion number(Y)and meteorological phenomena factors(X_(1-n)),the stepwise regression equation are stablished.Y=number of Haemadipsa hainana X_1=rainfall,X_2= windspd,X_3=rainday,X_4 =sun-shine,X_5=snowday,X_6=temp,X_7=humidity.The results of stepwise regression analysis show:1)population dynamic of haemadipsa Hainana are different every years,the effect of ainly meterological phenomena factors on population dynamic are X_1,X_2 and X_3.2) In Hainan Island,in the rainy season(May-October)population number are larger,the factors of effect on it are mainly X_1,X_2 and X_5.The dry season(November-next April),population number are small,the factors of effect on it's are X_1. 3) For eight years,in all 19 regression equations,factors.the impor-tant factors of the 7 meteorological factors which can influence on population ynamic are X_1,X_2 and X_5,X_7.