Analysis on the Population Structure and Spatial Distribution Pattern of Castanopsis sclerophylla Natural Forest in Yuan'an County

doi:10.14088/j.cnki.issn0439-8114.2018.14.021

Abstract

Abstract: With the means of quadrat investigation, the spatial distribution patterns of natural populations of Castanopsis sclerophylla（Lindl.） Schott. were determined by using 7 kinds of aggregation index. By preparation of static life tables and survival curves, the age structure and quantitative characteristics of the populations were analyzed. The results showed that, the spatial distribution of natural populations of C. sclerophylla showed aggregated distribution; The survival number of the static life table is rich, and the survival number of the second class decreased, the third class stage is at the stable development period, and the sixth grade had a decreasing trend. The population's biological characteristics and environmental factors, the internal and external competition among populations are the main reasons for this phenomenon. The survival curve is close to Deevey C, which indicates that the seedling mortality rate is very high, then followed by low and stable mortality. The numbers of age classes are sufficient, discontinuous development to the adult. The age-class structure is characterized as a large proportion of I-grade seedlings, which decrease in the process of transformation from grade Ⅱ to Ⅳ and higher-grade, discontinuous, reach to stable levels at the Ⅴ and Ⅵ grade, the trend of the population of grade Ⅶ and above toward mature forest decreases, which are resulted from the screening of the environmental conditions. The quantification of the structure showed the steady growth of the population. The results show that the population of C. sclerophylla can maintain its stability and spread under the natural condition, by strengthening the protection of natural forests of C. sclerophylla, with appropriate anthropogenic interference and structured forest management, maintaining for the aggregated growth of the population and promoting population renewal, the proliferation of quantity and scope can be maintained.

Key words: Castanopsis sclerophylla （Lindl.） Schott., population structure, spatial distribution pattern, Yuan'an county

CLC Number:

S792.17⁺3.54⁺2（634YA）

XIAO Zheng-li, YANG Zhong-shu, QIN Song, ZHOU Dan. Analysis on the Population Structure and Spatial Distribution Pattern of Castanopsis sclerophylla Natural Forest in Yuan'an County[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(14): 90-96.

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