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Study on Seed Rain, Soil Seed Bank and Population Age Structure Characteristics in Natural Communities of Taxus Chinensis Var. Mairei

Author: YueHongJuan
Tutor: ZhuJinZuo；ZuoChuan
School: Fujian Normal University
Course: Botany
Keywords: seed rain soil seed bank age structure survivorship curve Taxus chinensis var.mairei
CLC: S791.49
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 0
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Abstract


Taxus chinensis var. mairei is a endangering and precious plant. The characteristics of temporal and spatial pattern of quantity and quality of seed rain, the vertical and horizontal distribution pattern of soil seed bank and how many whole seeds add to the seed bank from seed rain in a year were studied based on field survey and observation in this paper. In addition, age structure characteristics of natural population of T.chinensis var. mairei in the four districts in Fu Jian Province were studied and compared. The results showed:(1) The period of seed rain lasted three months, and the peak period lasted about forty days. Density of seed rain during peak period was more than half of total seed rain. Most seed rain failed in the area of canopy, and the difference of seed rain density was significant. More than half of seeds from seed rain were vigorous during a year.(2) Seeds in soil seed bank mainly ratianed in the litter layer in vertical direction and within the area of canopy in honrizontal direction. Vigorous whole seeds were less than thirty percents of total ones in the soil.(3) Only less than fifteen percents of the seeds from seed rain added to the soil seed bank every year.(4) Population age structure of T.chinensis var. mairei was pyramis type. The survivorship curve indicated that the highest mortality occured in the process from seedlings to saplings during the whole life history.

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