| 生物土壤与生态 |
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| Analysis on the Minimum Sampling Area of Vegetation Survey in the Lower Reaches of the Tarim River |
| LI Xia, TANG Jin, WAN Hong-mei |
| College of Prataculture and Environment Science, Xinjiang Agricultural University, Urumqi 830052, China |
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Abstract The minimum sampling area with different vegetation species proportion and the relationships between the minimum sampling area and groundwater conditions are analyzed based on the linear, non-linear species-area models and nested sampling investigation of 38 basic quadrats of 64 m×64 m in the lower reaches of the Tarim River. The results show that optimal model can be established by species-area curve, and the minimum sampling areas are 418 m2, 707 m2, 1 138 m2, 1 702 m2 and 2 656 m2 respectively when the proportions of quadrat species to community species are 50%, 60%, 70%, 80% and 90% respectively. The number of vegetation species decreases and the grow vigor of plants drops with the increase of the distance off the Tarim River. When the proportion of quadrat species to community species is 50%, the minimum sampling areas change with the change of the groundwater levels at different distances off the Tarim River, and the groundwater condition is the key factor resulting in the variation of minimum sampling area.
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Received: 12 January 2011
Published: 20 September 2011
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2011, Vol. 31 
