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JOURNAL OF DESERT RESEARCH  2012, Vol. 32 Issue (6): 1655-1661    DOI:
Biology and Soil     
Influence of Irrigation Amounts on Seedling Growth and Biomass Allocation of Calligonum caput-medusae at the Southern Fringe of the Taklimakan Desert
LIU Zhen1,2,3, ZENG Fan-jiang1,3, AN Gui-xiang1,2,3, LIU Bo1,2,3, LI Hai-feng1,2,3, ZHANG Li-gang1,2,3, GAO Huan-huan1,2,3
1.Xinfiang institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Graduate University, Chinese Academy of Sciences, Beijing 100049,  China; 3.Cele National Field Science Observation and Research Station of Desert Grassland Ecosystem, Qira 848300, China
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Abstract  

Water is a key limiting factor  for desert ecosystem, and plant seedlings exhibit various adaptive strategies in different irrigation treatments. Our research on the effects of three irrigation treatments on the seedlings growth and biomass distribution of Calligonum caput-medusae was conducted at the southern fringe of the Taklimakan Desert, Northwest China. The three irrigation treatments were 0 mm (treatment 1), 100 mm (treatment 2) and 200 mm (treatment 3), and the irrigation was applied once during the growing season. Changes in biomass allocation, root depth distribution, root surface area, root/shoot ratio, litter mass/aboveground mass rate were investigated. The root biomass of C. caput-medusae seedlings in treatment 1 is higher than in the other two treatments. Root/shoot ratio increases from 0.16 to 0.32 with decreasing irrigation treatments. The vertical length of main root and horizonal root range of C. caput-medusae seedlings is larger in treatment 1 than in the two other treatments. Root length in treatment 1 exceeds 180 cm, and that in the other two treatments is less than 160 cm. So C. caput-medusae adapts to soil water decreasing by increasing root length. Litter mass of C. caput-medusae seedlings increases with decrease of irrigation amounts. With increase of irrigation amounts, the plant height and crown width of C. caput-medusae seedlings increase at first and then decrease, and the basal stem increases continuously, but there is no significant difference among the three treatments.

Key words:  biomass allocation      seedlings      Calligonum caput-medusae      irrigation amount      growth characteristics     
Received:  12 March 2012      Published:  12 May 2012
ZTFLH:  Q945  

Cite this article: 

LIU Zhen1,2,3, ZENG Fan-jiang1,3, AN Gui-xiang1,2,3, LIU Bo1,2,3, LI Hai-feng1,2,3, ZHANG Li-gang1,2,3, GAO Huan-huan1,2,3. Influence of Irrigation Amounts on Seedling Growth and Biomass Allocation of Calligonum caput-medusae at the Southern Fringe of the Taklimakan Desert. JOURNAL OF DESERT RESEARCH, 2012, 32(6): 1655-1661.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2012/V32/I6/1655

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