light saturation points of Ping_ou 110 and Ping_ou 349 were 691～724 μmol m~ -2 s~ -1 and 464～505 μmol m~ -2 s~ -1 , light compensation points were 10～26 μmol m~ -2 s~ -1 and 8～21 μmol m~ -2 s~ -1 , respectively, they were lower than those of common deciduous fruit trees;
In morphology,there are 14 arbor species (1 evergreen,13 deciduous),9 shrub species (2 evergreen, 7 deciduous),7 liana species (1 grassy,6 woody , 1 evergreen stunned or shrub species, 2 decciduous stunned or strub species and 24 herb species. In all of these exclusive species ,there are 11 that distribute in the area extensively.
The new dental caries incidence of deciduous teeth in the experimental group (23.02%) was higher than that of the control group (5.98%) (x2=42.5456,P<0.01) As for the average dental caries incidence,there was a big margin between the control group (0.16) and the experimental group (0.080).
The result shows:the total number of decayed teeth is 2443 among 1822 examined children,caries of deciduous teeth are 1522 and carries of permanent teeth are 921,rate of caries is 52.85%,rate of tenyear-old children with caries is the highest of all rate of girls with carries(57.09%)is higher than that of the boys with carries(48.88%).
Conclusion: The results indicate that all of the three fluoride-containing agents can promote the remineralization of deciduous teeth in vitro, and that both APF-LaCl 3 and 380 g/L Ag(NH 3) 2F are more effective than 100 g/L(NH 4) 2, MoO 2 F 4.
Four exfoliated hypoplastic anterior deciduous teeth were studied about the solubility of dental enamel in order to compare the solubility of the defective enamel with that of the normal enamel in the same teeth.
But if we counted with individuals,DBH or IV,the highest percentage of deciduous components was only 24.7% and then we defined the community as semi-humid evergreen broad-leaved forest with deciduous components.
The duration of the period with leaves slightly affects the temperature sensitivity of woody organisms since the Q10 values for root and stem of coniferous evergreen trees did not differ significantly from deciduous trees (p>amp;gt;0.10).
Compared with other forest types, cycling rate of N in the community was lower than in deciduous broad-leaved forests, rain forests, and mangroves, and was moderate in evergreen broad-leaved forests.
Among them the water carrying abilities of the litter of Lithocarpus glabra and natural deciduous forests are larger than that of Pinus massoniana.
With a temperate continental monsoon climate, the mountain area belongs to the warm temperate deciduous broad-leaved forest region.
The dynamics of litter stock in coniferous and deciduous forests proved to correlate with the biomass and total abundance of microorganisms, particularly, with the proportion of microfungi in the microbial community.