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JOURNAL OF DESERT RESEARCH  2012, Vol. 32 Issue (6): 1647-1654    DOI:
Biology and Soil     
Ecological Regulation of Stipagrostis pennata by Rhizosheath Microhabitat
QIU Dong, WU Nan, ZHANG Yuan-ming, PAN Hui-xia
Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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Abstract  

Stipagrostis pennata is a typical pioneer psammophyte species in Gurbantunggut Desert of the Junggar Basin in Northern Xinjiang. It is resistant to high temperature, drought, and sandstorms. It is also an excellent forage for livestock. This psammophyte resists drought through several mechanisms. This study expands our knowledge of its ecological effect on sand surface stability due to the presence of a rhizosheath. Results showed that: (1) Rhizosheaths differ markedly from typical soil grains for their physical and chemical properties, and are important biological factors in the formation, stability, and fertility of soil. (2) The space between rhizosheaths and roots may store water to help the plant resist drought. Rhizosheath soil was significantly (P<0.01) wetter than surrounding sand soil. The most likely explanation of this difference is that the presence of mucigel within the rhizosheath increases the water-holding capacity of that soil. There were also abundant organic nutrients in the rhizosheath soil. The available nitrogen (such as NH+4) and microbial biomass nitrogen in the rhizosheath were both significantly (P<0.01) higher than those in non-rhizosheath soil. (4) The significantly higher activity of soil enzymes (ployphenol oxidase, peroxidase, invertase, urease, alkaline phosphatase) found in the rhizosheath suggested increased C and N cycling. (5) Rhizosheath microhabitats were found to be a favorable environment for the growth and development of microorganisms, especially fungi. The quantities of bacteria, fungi, actinomycetes and oligotrophic bacteria cultured from rhizosheath soil were significantly higher than those in non-rhizosheath soil. Based on the primary identification, the dominant genera were Bacillus, Streptomyces and Penicillium. These organisms might play important roles in forming the rhizosheath, inhibiting the growth of plant pathogens, and increasing plant-available nutrients, thereby promoting plant growth. Thus, the rhizosheath of Stipagrostis pennata is an important adaptation to arid environments, and an integral part of soil microbe ecology.

Key words:  Stipagrostis pennata      rhizosheath      non-rhizosheath      microorganism      enzyme activity      soil nutrition      Gurbantunggut Desert     
Received:  09 April 2012      Published:  13 June 2012
ZTFLH:  S154.3  

Cite this article: 

QIU Dong, WU Nan, ZHANG Yuan-ming, PAN Hui-xia. Ecological Regulation of Stipagrostis pennata by Rhizosheath Microhabitat. JOURNAL OF DESERT RESEARCH, 2012, 32(6): 1647-1654.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2012/V32/I6/1647

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