| Biology and Soil |
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| Morphology and Biomass Characteristics of Ephemeroid Plant Allium pallasii and Their Relationships in Junggar Basin, China |
| TAO Ye1, 2, ZHANG Yuan-ming1, QUAN Yong-wei3, HOU Jian-xiu3 |
1.Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3.Construction and Management Bureau for Irtysh River Basin Development Engineering in Xinjiang, Urumqi 830000, China |
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Abstract Allium pallasii, an ephemeroid species, is widely distributed in Junggar Basin, China, and it plays a certain role in synusiae communities of the herbaceous plants in spring. The distribution of A. pallasii population in sixteen 20 m×20 m plots were surveyed by the method of whole plant excavation, and the biological characteristics, biomass allocation and their relationships were studied in this paper. Results indicate that (1) A. pallasii population is mostly distributed at the lower parts of sand dunes, and the population density is 0.187 individual per square meter; The mean shoot height is 22.93~5.15 cm, most of the individuals have 3 sheets of leaves; The inflorescence is nearly spherical, and the mean radius of the flowers is 2.44~0.37 cm, the mean angle of vertical section of the flowers is 211.39~60.4, and the surface area and volume of the flowers are 50.95~34.19 cm2 and 43.37~29.45 cm3, respectively. (2) There are markedly (P<0.05) or very markedly (P<0.01) positive correlations among morphological indices (mean leaf length, the four flower morphology indicators and the bulb diameter), among organ biomasses (except root biomass), and between morphological indices and organ biomasses of A. pallasii, indicating there existed evident cooperative growth relationships between the indices. (3) The organ biomass distribution order of A. pallasii is bulb>scape>flower>leaf>root, and the root/shoot ratio is 0.873, and the reproductive allocation ratio is 49.66%. (4) There are obviously allometric relationships between morphological indicators and organ biomasses with allometric exponents less then 1.0. The allometric exponents among organ biomasses are mostly close to 1.0, only the allometric exponent between aboveground and belowground biomass is 3/4. (5) The biomass measurement of A. pallasii samples showed that mean aboveground biomass of A. pallasii population is 0.312 g per individual, mean belowground biomass is 0.264 g per individual, and the total biomass density is only 1.06 g per square meter. It is founded that the ratio of A. pallasii biomass in the desert ecosystem is nearly negligible. However, as an important germplasm in Junggar basin, A. pallasii should be deeply studied on many aspects, and also should be protected properly.
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Received: 23 December 2011
Published: 20 September 2012
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2012, Vol. 32 
