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

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

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．

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.