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| Effects of Sand-burying on Seed Germination and Seedling Growth of Haloxylon ammodendron |
| Wang Guohua1,2, Zhao Wenzhi1 |
1. Key Laboratory of Inland River Ecohydrology/Linze Inland River Basin Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract This paper studied the effects of sand-burying on the seed germination and seedling emergence and growth of Haloxylon ammodendron in a typical arid desert region under nature conditions. Six treatments of sand-burying of depths 0, 1, 2, 3, 4 cm and 5 cm were designed and each treatment included five replicates. Results demonstrated that the seedling emergence decreased with increasing sand-burying depth. The optimal sand-burying depth for seedling emergence of H. ammodendron was 1 cm and the seedling emergence rate at this depth was 39.2%. The depth of 4 cm was the maximum depth for H. ammodendron to emerge. However, the seedling growth rate and survival rate of H. ammodendron increased with increasing sand-burying depth. The seedling survival rate of H. ammodendron at 4 cm burial depth was 100% and the survival rate at 0 cm was 0. Considering both seed germination rate and seedling survival rate, the optimal burial depth was 2 cm and the seedlings at 2 cm burial depth were the main source for population regeneration. Seedling height was significantly affected by the sand burial depth. At the same period,the maximum seedling height of H. ammodendron was at 4 cm sand burial depth and the minimum was at 0 cm. In the first year, the seedling height of H. ammodendron unearthed from 4 cm was 21.5 cm and the height of seedling unearthed from surface was only 2.76 cm.
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Received: 17 December 2013
Published: 20 March 2015
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2015, Vol. 35 
