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| Effects of Water Table Depth on Leaf Morphology and Growth of Alhagi sparsifolia Seedlings |
| Peng Shoulan1,2, Zeng Fanjiang1, Wang Huiti1,2, Guo Jingheng1,2, Gao Huanhuan1,2, Luo Weicheng1,2, Song Cong1,2 |
1. Cele National Field Observation and Research Station of Desert Grassland Ecosystem/Key Laboratory of Biogeography and Bioresource in Arid Land/State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academic of Science, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The seedlings of Alhagi sparsifolia were chosen as the experimental materials, and five groundwater table treatments (40, 80, 120, 180 cm and 220 cm) were proceeded to analyze the influences of increasing phreatic water depth on the leaf morphology and growth of Alhagi sparsifolia seedlings. The results are as follows: With the increase of water table depth, the leaf thickness increased gradually and reached the maximum under the treatment of 220 cm. The leaf length and width increased firstly and then decreased, they both reached the maximum under the treatment of 120 cm. Changing water table depth had no significant impact on the height of seedling, but its impacts on the canopy and branch number of seedling were significant (p<0.05). The roots grew and got close to the groundwater with an average rate of 1.24 cm per day under the treatment of 40 cm, and the growing rate of roots under the other treatments increased with increasing ground water depth. The growing rate of roots under the treatments of 180 cm and 220 cm were higher than the other treatments apparently. It took 123 days for the roots to get to the 220 cm water depth. With increase of phreatic water depth, the biomass of seedling increased firstly and then decreased. The maximum biomass of leaf and stem appeared under the treatment of 120 cm, and the maximum biomass of root was under the treatment of 180 cm. The results indicated that the changes of water table depth had different influences on the aboveground part and roots. The increase of ground water table depth helped to increase the length and biomass of roots. The depth of 120 cm could be taken as an crucial point, phreatic water depth deeper or shallower than that point would restrict the growth of the aboveground part. The seedlings had slow growth and the fewest biomasses accumulation under the water depth of 220 cm, suggesting that the groundwater table depth over 220 cm was harmful for the growth of seedling.
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Received: 12 March 2013
Published: 20 March 2014
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Corresponding Authors:
曾凡江（Email：zengfj@ms.xjb.ac.cn）
E-mail: zengfj@ms.xjb.ac.cn
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2014, Vol. 34 
