| 生物土壤与生态 |
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| Response of Oxytropis aciphylla Community to Soil Nutrient Spatial Heterogeneity |
ZHANG Ning, TENG Jiu-lin, HE Xing-dong, WANG Hai-tao, GAO Yu-bao
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| College of Life Sciences, Nankai University, Tianjin 300071, China |
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Abstract In the present study, a sampling plot of 20m×80m in Oxytropis aciphylla community, which located on the eastern boundary of Tengger Desert in the Left Banner of Alashan League in Inner Mongolia, was chose to investigate the quantum feature of plant populations, measure soil total organic matter, total nitrogen, total phosphorus, available nitrogen and available phosphorus within 40 cm depth, and calculate spatial heterogeneity of regional variances of the soil and the vegetation and discuss their responses in accordance with scales. In the plot, there were 100 quadrats of 4m×4m. Results showed that, as scale increase from 800 m2 to 1 600 m2, the spatial heterogeneities of soil organic matter and total nitrogen decreased, the total phosphorus and the available phosphorus increased, and that of available nitrogen remained constant. In the mean time, spatial heterogeneity of the density and the leaf biomass of all three plants increased. These suggested that total phosphorus and available phosphorus are generally the main factors restraining plant distribution in the O. aciphylla community, especially for perennial herbaceous plant Peganum harmala. Further analysis indicated these are caused by island effect of shrubs in the desert and the compensatory mechanism to raise plant suction force using available phosphorus.
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Received: 25 June 2007
Published: 20 July 2008
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2008, Vol. 28 
