Population structure and distribution pattern of Davidia involucrata at Labahe Nature Reserve of Sichuan Province

ZHANG Wang; CAO Guo-xing; LIU Guang-hua; LIU Xin

Volume 25 Issue 4

Aug. 2008

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ZHANG Wang, CAO Guo-xing, LIU Guang-hua, LIU Xin. Population structure and distribution pattern of Davidia involucrata at Labahe Nature Reserve of Sichuan Province[J]. Journal of Zhejiang A&F University, 2008, 25(4): 451-457.

Citation:

ZHANG Wang, CAO Guo-xing, LIU Guang-hua, LIU Xin. Population structure and distribution pattern of Davidia involucrata at Labahe Nature Reserve of Sichuan Province[J]. Journal of Zhejiang A&F University, 2008, 25(4): 451-457.

Population structure and distribution pattern of Davidia involucrata at Labahe Nature Reserve of Sichuan Province

1.
Forestry and Horticulture College，Sichuan Agricultural University，Ya’an 625014，Sichuan，China

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Corresponding author: CAO Guo-xing
Publish Date: 2008-08-20

Abstract

Davidia involucrata is a relic species of paleotropical kingdom in Tertiary period，belonging to Davidiaceae with a single genus. In recent years，the increase of regional developing projects has led to a sharp decrease of this species in natural population. The population characteristics of D. involucrata were discussed here，and the dynamic changes of its population were analyzed systematically，in order to provide basic data for further study，and to probe into conservation policy on this species. Quadrates with a contiguous grid were used to collect field data of D. involucrata at Labahe Nature Reserve of Sichuan Province. Size and height class structures were established；a time-specific life table was produced；and survivorship curves were drawn. A t-test of the variance/mean （v/m） ratio，the negative binomial parameter，the mean crowding index，and the patchiness index were used to analyze the distribution pattern and dynamics. The results showed：（1） the population structure of the D. involucrata population was a inverse-pyramid type. （2）The structure of D. involucrata population was declining due to a lack of seedlings. （3） Also，the main regeneration mode of D. involucrata was asexual reproduction. （4）From early age to old age，the population was first characterized as unstable，then stable，and finally degraded with a type Ⅲ Deevey Curve describing survival. （5）Generally，the D. involucrata population was clumpy，and the aggregation intensity tended to decrease from the sapling to the mature tree stage，the aggregation intensity also changed with block sizes. The results above indicated that the interaction between biological and ecological properties mainly decided the spatial population structure and distribution pattern. ［Ch，3 fig. 5 tab. 22 ref.］
- forest ecology,
- Davidia involucrata,
- population structure,
- population dynamic,
- distribution pattern,
- aggregation intensity,
- Labahe Nature Reserve of Sichuan Province

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Population structure and distribution pattern of Davidia involucrata at Labahe Nature Reserve of Sichuan Province

1. Forestry and Horticulture College，Sichuan Agricultural University，Ya’an 625014，Sichuan，China

Corresponding author: CAO Guo-xing

Publish Date: 2008-08-20

Key words:

forest ecology /
Davidia involucrata /
population structure /
population dynamic /
distribution pattern /
aggregation intensity /
Labahe Nature Reserve of Sichuan Province

Abstract: Davidia involucrata is a relic species of paleotropical kingdom in Tertiary period，belonging to Davidiaceae with a single genus. In recent years，the increase of regional developing projects has led to a sharp decrease of this species in natural population. The population characteristics of D. involucrata were discussed here，and the dynamic changes of its population were analyzed systematically，in order to provide basic data for further study，and to probe into conservation policy on this species. Quadrates with a contiguous grid were used to collect field data of D. involucrata at Labahe Nature Reserve of Sichuan Province. Size and height class structures were established；a time-specific life table was produced；and survivorship curves were drawn. A t-test of the variance/mean （v/m） ratio，the negative binomial parameter，the mean crowding index，and the patchiness index were used to analyze the distribution pattern and dynamics. The results showed：（1） the population structure of the D. involucrata population was a inverse-pyramid type. （2）The structure of D. involucrata population was declining due to a lack of seedlings. （3） Also，the main regeneration mode of D. involucrata was asexual reproduction. （4）From early age to old age，the population was first characterized as unstable，then stable，and finally degraded with a type Ⅲ Deevey Curve describing survival. （5）Generally，the D. involucrata population was clumpy，and the aggregation intensity tended to decrease from the sapling to the mature tree stage，the aggregation intensity also changed with block sizes. The results above indicated that the interaction between biological and ecological properties mainly decided the spatial population structure and distribution pattern. ［Ch，3 fig. 5 tab. 22 ref.］

Population structure and distribution pattern of Davidia involucrata at Labahe Nature Reserve of Sichuan Province

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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