Study On Natural Population Life Table And Influence Of Forest Management Measures On Natural Population Of Saperda Papulnea L. In Yanbei Region Shanxi Province

The natural population of Saperda Papulnea L. in four different forest stands and sites were investigated and studied in xujiazhuang forestland and jinshatan forestland during 2001-2003. We compiled life table of natural population of Saperda papulnea L..Compared with the results in 1981-1985; at the same time, investigated controlling effect of different foster measures to the population of Saperda papulnea L.. Scientifically based for sustainable ecological controlling of Saperda Papulnea L. The results as follows: 1. From the life table, we drew a conclusion that survivor-rate in high-productive man-made forest neared to zero (two –five bug warts were just found in high-productive man-made forest); The change trend of survivorship curve was similar to the result of 1981-1985 in general-productive man -made forest and low-productive man made forest. The maximum death-rate-change occurred in 1st instar larva. This deeply showed: 1st instar larva was most feebleness tache in entire generation of Saperda Papulnea L..It was key period of preventing the population; moreover, the period of imago was the key period too. 2.By compared, there was a significant decrease of population survivor-rate in different instars and in different forest stands and sites. Survivor-rate of population of Saperda Papulnea L. presented downtrend. The key factor influencing population was desiccation in general-productive man-made forest, which coincided with the result in 1981-1985.the key factors influencing population in low-productive man-made forest changed as desiccation and pathogen (The key factor were beeautoeciousness and pathogen in 1981-1985). These key factors were independed of population density.