|Table of Contents|

STUDY ON THE PATTERNS OF CONVOLVULVS TRAGACUTHOIEDES POPULATION IN THE UPPER REACHES OF THE MINJIANG RIVER(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
1997 03
Page:
193-198
Research Field:
Publishing date:

Info

Title:
STUDY ON THE PATTERNS OF CONVOLVULVS TRAGACUTHOIEDES POPULATION IN THE UPPER REACHES OF THE MINJIANG RIVER
Author(s):
Sun Shucun Liu Zhaoguang
Chengdu Institute of Biology, Academia Sinica, Chengdu 610041
Keywords:
Convolvulus tragacuthoiedeslife tableage structuresurvival curvedistribution pattern
CLC:
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DOI:
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Abstract:
Convolvulus tragacuthoiedes, a dominant species of the semiarid scrubs in the upper reaches of the Minjiang River was studied to explore its ecological significance in this region. A life table of C. tragacuthoiedes population was built based on random sampling and anatomical study. The results showed that the age structure was of stable development type, the survival curve approximated to the Decvy Ⅲ, and the two mortality peaks in its life history were at the ages 1 a and 4a~5a, respectively. The dynamics of C.tragacuthoiedes population could be described by the following model:Xx=3.37·x-3.21 (r=0.801,P<0.05;where Xx= number of survival, x=age). The results of both X2-test and blocked-quadrat variance (BQV)analyses indicated that the distribution pattern of the C. tragacuthoiedes population, due to the distinct degree of ground surface tettering and water content, tends to be random and aggregative distribution respectively in the two plots studied.

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