AOBPreview originally published online on August 25, 2004
Annals of Botany 2004 94(4):553-560; doi:10.1093/aob/mch174
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Annals of Botany 94/4, © Annals of Botany Company 2004; all rights reserved
Effects of Sand Burial on Survival, Growth, Gas Exchange and Biomass Allocation of Ulmus pumila Seedlings in the Hunshandak Sandland, China
1 Institute of Botany, the Chinese Academy of Sciences, Nanxincun 20, Beijing 100093, China and 2 National Climate Center, China Meteorological Administration, Beijing 100081, China
* For correspondence. E-mail shilei67{at}263.net
Received: 2 March 2004 Returned for revision: 16 April 2004 Accepted: 21 June 2004 Published electronically: 25 August 2004
• Background and Aims In the last decade, the number of young plants of Ulmus pumila in the Hunshandak Sandland has decreased sharply because of severe sand burial, and their ecological protective function has been weakened. In order to develop an understanding of the tolerance of U. pumila to sand burial and to suggest reasonable measures to protect the sparse-elm–grassland ecosystem, the effects of burial on the survival, growth, photosynthesis and biomass allocation in U. pumila were studied.
• Methods Seedlings were buried at five different depths in pot experiments: no burial (control), partial burial (33 % and 67 % stem height), and complete burial (100 % and 133 % stem height). Growth analyses and measurements of photosynthesis were carried after the plants had been uncovered.
• Key Results All the plants survived partial burial, but about 30 % and 80 % of the seedlings died as a result of the 100 % and 133 % sand burial treatments, respectively. The numbers of newly produced leaves and branches, and the height of the stems of the seedlings in the 33 % and 67 % burial treatments during the period of the experiment were significantly greater than those in the control. Furthermore, net photosynthetic rate, transpiration rate and water use efficiency were also elevated by the partial burial, but not affected by burial time. This might be attributed to the increased root length, which improved water acquisition. The biomass and biomass allocation of the seedlings were significantly changed by the burial treatments and burial times. The biomass was enhanced by partial burial but was reduced by complete burial at each burial time. However, the biomass allocation was not significantly changed by the 33 % and 67 % sand burial treatments 2 or 4 weeks following the burial.
• Conclusions Ulmus pumila was shown to be tolerant to partial sand burial, but must be protected from complete burial.
Key words: Biomass allocation, Ulmus pumila, gas exchange, growth, Hunshandak Sandland, sand burial
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