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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (5): 1356-1362    DOI: 10.7522/j.issn.1000-694X.2013.00199
Biology and Soil     
Influence of River Flooding on the Distribution Pattern of Populus euphratica in the Lower Reaches of the Tarim River
BAI Yuan1,2, XU Hai-liang1, ZHAO Xin-feng1, FU Jin-yi1,2, WANG Xi-yi1,2, DU Qing1,2
1.State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.University of Chinese Academy of Sciences,Beijing 100049, China
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Abstract  

In order to analyze the distribution pattern of seedlings of Populus euphratica after river overflowing, we calculated Clark-Evans index for four typical flooded sites (Kunasite, Alagan, Moguiba and Yiganbujima) to measure the distribution pattern by using the point pattern analysis method and test the deviation of actual Clark Evans index from 1 by using the standard normal distribution. The results indicated that: (1) After the river overflow, the density of P. euphratica had significant change. In the quatrats of 20 m×20 m, the spatial distribution patterns of P. euphratica varied after experiencing river overflowing in different sections. (2) With the increasing of quadrates area, the Clark-Evans indices had different degrees of fluctuation, in the Kunasite and Alagan sections, the P. euphratica seedlings appeared to have an random distribution that had no significant change with the scale changes, but in the Moguiba and Yiganbujima sections, the special distribution pattern of seedlings of P. euphratica changed from random distribution to aggregated distribution with the scale changes, which show that the population distribution pattern depended on the scaling. (3) With the growth of P. euphraticas age, the density of P. euphratica had decrease trend, the special distribution pattern of seedlings of P. euphratica changed between aggregated distribution and random distribution. The P. euphratica seedlings are mainly distributed in the river flood plain or river overflowing area, the vegetation quadrates of 20 m×20 m can ensure the rational and scientific trials. The study of the spatial distribution patterns of P. euphratica seedling after river overflowing is imperative for the understanding of the process of succession and the acceleration of conservation and restoration of the desert riparian ecosystem.

Key words:  point pattern analysis      Populus euphratica      river flooding      Tarim River     
Received:  11 August 2012      Published:  04 September 2012
ZTFLH:  Q948.11  

Cite this article: 

BAI Yuan1,2, XU Hai-liang1, ZHAO Xin-feng1, FU Jin-yi1,2, WANG Xi-yi1,2, DU Qing1,2. Influence of River Flooding on the Distribution Pattern of Populus euphratica in the Lower Reaches of the Tarim River. JOURNAL OF DESERT RESEARCH, 2013, 33(5): 1356-1362.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00199     OR     http://www.desert.ac.cn/EN/Y2013/V33/I5/1356

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