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| Response of Aboveground Biomass Allocation in Four Dominant Species to Water and Nitrogen Addition in the Horqin Sandy Land |
| Chen Jing, Li Yulin, Cui Duo, Mao Wei, Zhao Xueyong |
| Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract Nitrogen and water are the main constraints in semi-arid sandy land, nitrogen deposition and variations in precipitation probably affect plant growth and thereby affect ecosystem function in sandy land. A field study was conducted to detect the effects of nitrogen and water addition on the aboveground biomass accumulation and allocation of the four dominant herbaceous species (Pennisetum centrasiaticum, Setaria viridi, Cleistogenes squarrosa and Chenopodium acuminatum) by adding water (precipitation in summer and snow in winter), nitrogen and nitrogen-water interaction for two consecutive years in the Horqin Sandy Land. The results showed that adding nitrogen or water lonely would have no noticeable effects on the average total biomass, the average biomass of its components and its allocation of the propagules and stems in 4 dominant species. Adding nitrogen with water in summer, however, leaded to a significant increase in the average of aboveground total biomass and the average biomass of it components in 2010. Meanwhile, adding nitrogen with snow in winter increased the allocation of leaf biomass remarkably in 2010 and but showed no significant effect on biomass allocation in every treatment in 2012. This implies that adding nitrogen with water could alleviate the interactive constraining between nitrogen and water, subsequently enhance allocation of the limiting resources to leaf. The influences of nitrogen and water addition on aboveground biomass allocation were somewhat related to plant species. The results showed that adding nitrogen and water significantly affected aboveground biomass and its allocation in S. viridis. However, no significant effects were detected in P. centrasiaticum, C. acuminatum and C. squarrosa.
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Received: 22 April 2013
Published: 20 May 2014
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Corresponding Authors:
李玉霖（Email：lyulin@gmail.com）
E-mail: lyulin@gmail.com
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2014, Vol. 34 
