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JOURNAL OF DESERT RESEARCH  2008, Vol. 28 Issue (4): 657-664    DOI:
生物土壤与生态     
Study on Relation Between Soil Seed Bank and Standing Vegetation along Different Degradation Levels of Desert Riverside Forest in Lower Reaches of Tarim River
XU Hai-liang1, LI Ji-Mei1, Zhang Zhan-Jiang1, YE Mao2, WANG Zeng-ru1
1.Xinjiang Institute of Ecology and Geography Research, Chinese Academy of Sciences, Urumqi 830011, China; 2.College of Earth Science and Tourism, Xinjiang Normal University, Urumqi 830011, China
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Abstract  

Experiments for two years on seed bank germination were conducted in nineteen plots at four typical transects under different vegetation degradation levels along the lower reaches of Tarim River in Xinjiang, aiming to study the relation between standing vegetation and soil seed bank in severely ecological degradation area. Results show that: ①from lightly degraded region to extremely degradation region, the relative density, relative cover and relative frequency of the annual and perennial species gradually decrease, but the relative density, relative cover and relative frequency of the shrub and arbor gradually increase; the cover of dominant species also declines, and the cover and the diversity of the vegetation community obviously decline. ②The seed bank density in the lower reaches of Tarim River ranges from 166 to 2 012 seed·m-2. The AVON results show that there are remarkable differences in soil seed bank density along different vegetation degradation levels (F=7.922, P<0.05). The vertical distribution of seed bank is that the seed bank density reduces with the increase of the depth, 0—5 cm occupying 71%, 6—10 cm 19%,11—30 cm occupying 10%. In the lightly degraded region, the life form of seed bank is predominated by the annual, but with the degradation level increasing, the life form shifts from annual to shrub and arbor, and the diversity of soil seed bank gradually declines. ③The Sorensen’s similarity coefficient between seed bank and the standing vegetation is low, averagely 0.219. The number of co-occurring species both in the seed bank and the standing vegetation decrease with the degradation level increasing.

Key words:  lower reaches of Tarim River      soil seed bank      standing vegetation      relation     
Received:  18 June 2007      Published:  20 July 2008
ZTFLH:  Q945.5  

Cite this article: 

XU Hai-liang;LI Ji-Mei;Zhang Zhan-Jiang;YE Mao;WANG Zeng-ru. Study on Relation Between Soil Seed Bank and Standing Vegetation along Different Degradation Levels of Desert Riverside Forest in Lower Reaches of Tarim River. JOURNAL OF DESERT RESEARCH, 2008, 28(4): 657-664.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2008/V28/I4/657

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