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Chen F.,Chinese Academy of Forestry | Chen F.,Key Laboratory of Cultivation and Utilization of Resource Insects of State Forestry Administration | Wang J.-M.,Chinese Academy of Forestry | Wang J.-M.,Key Laboratory of Cultivation and Utilization of Resource Insects of State Forestry Administration | And 7 more authors.
Forest Research | Year: 2012

A distribution map of Pinus yunnanensis was made according to the data on geographical distribution of P. yunnanensis by means of applying geographic information systems software ArcGIS, and the climatic parameters of the distribution areas for P. yunnanensis were determined by the climate forecast model ClimateChina. The relationship between the geographical distribution of P. yunnanensis and the climate was studied by adopting the indexes of Kira including the warmth index (WI), coldness index (CI) and aridity index (K), Xu's humidity index (HI), Holdridge's life temperature (BT), potential evapotranspiration (PET), potential evapotranspiration ratio (PER) and the single factors as the mean annual temperature, the mean temperature in January, the mean temperature in July, the mean annual precipitation, the >5°C accumulated temperature, the > 18°C accumulated temperature, the maximum temperature, the minimum temperature, the temperature variation, the ratio of temperature and precipitation of the year, etc. And the Kira's water-temperature indexes on distributional upper limit, low limit and north limit were discussed. The major climatic factors effecting the distribution of P. yunnanensis were screened out by statistical analysis software SPSS and the results showed the impact factors are in the order of temperature > humidity > the temperature difference between mean warmest month temperature and mean coldest month temperature.


Sun B.-G.,Chinese Academy of Forestry | Sun B.-G.,Key Laboratory of Cultivation and Utilization of Resource Insects of State Forestry Administration | Chen F.,Chinese Academy of Forestry | Chen F.,Key Laboratory of Cultivation and Utilization of Resource Insects of State Forestry Administration | And 8 more authors.
Forest Research | Year: 2012

The normal tree method was used to measure the biomass of Pinus yunnanensis and its distribution pattern with different diameter class in Tianzimiaopo Forest Farm, Nanhua County, Yunnan Province. The results indicated that the biomass was positively correlated with the diameter class. For the diameter class of 5 ~ 7.5 cm, the individual biomass was(6.642 ± 1.129) × 103 g, for the diameter class of 7.6 ~ 12.5 cm, it was(2.533 ± 0.387) × 10 g, for the diameter class of 12.6 ~ 17.5 cm, it was (5.897 ± 1.331) × 104 g, for the diameter class of 17.6 ~ 22.5 cm, it was (1.063 ± 0.211) × 105 g, and for the diameter class above 22.6 cm, it was (2.208 ± 0.409) × 10 g. There existed some changes in the biomass distribution among P. yunnanensis' organs with different diameter class. With the increase of diameter, the biomass proportion of stem and root decreased in initial stage and then increased, that of branch and needle increased in the initial stage and then decreased, while that of bark decreased. The biomass proportion of stem was the largest in layer of 0 ~ 2 m, which accounted for 27.62% of total biomass and that of the branch and needle were the largest in the layer of 6 ~ 8 m, which accounted respectively for 35.85% and 38.34% of the total biomass. Approximately 65.49% of total root biomass of P. yunnanensis distributed in the surface layer of 0 ~ 30 cm, and 34.51% in the other layers.


Ji H.-H.,Chinese Academy of Forestry | Ji H.-H.,Key Laboratory of Cultivation and Utilization of Resource Insects of State Forestry Administration | Feng Y.,Chinese Academy of Forestry | Feng Y.,Key Laboratory of Cultivation and Utilization of Resource Insects of State Forestry Administration | And 8 more authors.
Forest Research | Year: 2010

Effects of environmental factors including temperature, illumination and water content of substrate on egg hatching of Blaps rhynchopetera Fairmaire were studied in artificial climate chambers and room temperature. The results showed that the eggs could hatch out from 12 °C to 28 °C., the development duration was shortened and the developmental rate increased with the rise of temperature from 12 °C to 28 °C. The optimal temperature was between 12-25 °C. Eggs could not hatch at the temperature below 8 °C or over 31 °C. The developmental threshold temperature required for eggs was 10.08 ±0.93 °C, and the effective accumulated temperature was 99.91 ±8.11 degree-day. Among constant illumination of 0 - 12 000 lx, the hatching rates were reduced with the increase of illumination, and larvae were not found after treating eggs with constant illumination over or equal to 8 000 lx. In the experiment of temperature and water content of substrate, both the temperature and water content of substrate and their interaction effect influenced significantly on the hatching rate. The optimal combinations of substrate temperature and water content were selected based by multiple comparisons. The climatic factors limiting eggs hatching of this insect in Yunnan were also discussed in this paper.

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