Tsuga lorgibracteata\% is one of the rare gymnosperms and endemic to China. With the changes in environment and ecosystems, the total number of individuals has decreased rapidly and it is considered an endangered plan...Tsuga lorgibracteata\% is one of the rare gymnosperms and endemic to China. With the changes in environment and ecosystems, the total number of individuals has decreased rapidly and it is considered an endangered plant on the brink of extinction. This paper dealt with the growth dynamics of dominance of rare and endangered \%Tsuga lorgibracteata\% population based on the growth models, which were four limited space growth models for population. Compared with the fitting results of four models, the best growth model was selected to express the growth dynamics of dominance for \%Tsuga lorgibracteata\% population, which was \%s\%=exp (-0 046 804 ln\+2(1+108.386 5 e\+\{-0.594 42\%t\%\})-0.873 71 ln(1+108.386 5 e\+\{-0.594 42\%t\%\})+3.655 44). Then the environmental capacity of dominance of \%Tsuga lorgibracteata\% population was calculated. It was 38.684 7 m\+2\5hm\+\{-2\}. And the simulated result of dominance showed that when the diameter at breast height was about 40 cm, the population growth of dominance would be highest, which would provide a theoretical basis for the protection and management of \%Tsuga lorgibracteata.展开更多
The laboratory experiment results showed that the mite, Schizotetranychus nanjingensis, could not survive below -10 °C and above 41 °C. Its optimum temperature for it was 20～25 °C. It had very high sur...The laboratory experiment results showed that the mite, Schizotetranychus nanjingensis, could not survive below -10 °C and above 41 °C. Its optimum temperature for it was 20～25 °C. It had very high survival rate at 2 °C.The survive, development and reproduction of the mite varied with photoperiod. The development could not complete in darkness, but the eclosion of eggs was normal. The highest survival rate from egg to adult mite was in a photoperiod of ≥12 h. The shortest period (13 91 d) from young mite to adult female mite was in a photoperiod of 8 h and the longest period (32 33 d) was in 5 h .In the photoperiod of 8 h,≥12 h, the female mite could oviposit normally and the quantity of eggs were 9 13 and 12 67,respectively .The adult female could not oviposit and had the shortest longevity (10 d) in a photoperiod of 5 h.展开更多
文摘Tsuga lorgibracteata\% is one of the rare gymnosperms and endemic to China. With the changes in environment and ecosystems, the total number of individuals has decreased rapidly and it is considered an endangered plant on the brink of extinction. This paper dealt with the growth dynamics of dominance of rare and endangered \%Tsuga lorgibracteata\% population based on the growth models, which were four limited space growth models for population. Compared with the fitting results of four models, the best growth model was selected to express the growth dynamics of dominance for \%Tsuga lorgibracteata\% population, which was \%s\%=exp (-0 046 804 ln\+2(1+108.386 5 e\+\{-0.594 42\%t\%\})-0.873 71 ln(1+108.386 5 e\+\{-0.594 42\%t\%\})+3.655 44). Then the environmental capacity of dominance of \%Tsuga lorgibracteata\% population was calculated. It was 38.684 7 m\+2\5hm\+\{-2\}. And the simulated result of dominance showed that when the diameter at breast height was about 40 cm, the population growth of dominance would be highest, which would provide a theoretical basis for the protection and management of \%Tsuga lorgibracteata.
文摘The laboratory experiment results showed that the mite, Schizotetranychus nanjingensis, could not survive below -10 °C and above 41 °C. Its optimum temperature for it was 20～25 °C. It had very high survival rate at 2 °C.The survive, development and reproduction of the mite varied with photoperiod. The development could not complete in darkness, but the eclosion of eggs was normal. The highest survival rate from egg to adult mite was in a photoperiod of ≥12 h. The shortest period (13 91 d) from young mite to adult female mite was in a photoperiod of 8 h and the longest period (32 33 d) was in 5 h .In the photoperiod of 8 h,≥12 h, the female mite could oviposit normally and the quantity of eggs were 9 13 and 12 67,respectively .The adult female could not oviposit and had the shortest longevity (10 d) in a photoperiod of 5 h.
