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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (3): 696-702    DOI: 10.7522/j.issn.1000-694X.2013.00100
Biology and Soil     
Effects of Fertilization on Population Density and Biomass of Herbaceous Plants in Desert Steppe
SU Jie-qiong1.2, LI Xin-rong1, YANG Hao-tian1,2, ZHANG Ke1,2, YANG Xiao-ju1,2
1.Shapotou Desert Experiment 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  

In order to investigate the impacts of fertilizer enrichment on population density and productivity of herbaceous plants in the desert steppe, N, P, and N-P addition experiments were performed. Each fertilizer treatment included four addition levels, i.e. 0, 5, 10, and 20 g\5m-2. The results indicated that population density decreased with the increasing fertilizer addition levels regardless of the sort of fertilization, and especially, the total density as well as the density of Artemisia capillaris, Allium polyrhizum and Enneapogon brachystachyus significantly decreased compared to the control at the condition of 20 g\5m-2 N added. Responses of aboveground and root biomasses to fertilizer enrichment were similar to that found in population density, both the total aboveground biomass and the aboveground biomasses for A.capillaris, A. polyrhizum and E. brachystachyus were negatively correlated with increasing fertilizer addition levels, with all determination coefficients (R2) greater than 0.80. Therefore, in the case of desert regions (annual precipitation <180 mm), fertilizer enrichment would inhibit population density and productivity of herbaceous plants regardless of the sort of fertilizer.

Key words:  desert steppe      herbaceous vegetation      nitrogen fertilizer      phosphorus fertilizer      biomass     
Received:  14 May 2012      Published:  18 June 2012
ZTFLH:  Q948.113  
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Cite this article: 

SU Jie-qiong1.2, LI Xin-rong1, YANG Hao-tian1,2, ZHANG Ke1,2, YANG Xiao-ju1,2. Effects of Fertilization on Population Density and Biomass of Herbaceous Plants in Desert Steppe. JOURNAL OF DESERT RESEARCH, 2013, 33(3): 696-702.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00100     OR     http://www.desert.ac.cn/EN/Y2013/V33/I3/696

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