Indicating appropriate groundwater tables for desert river-bank forest at the Tarim River, Xinjiang, China
Based on data collected over 2 years of monitoring the lower reaches of the Tarim River, the groundwater table depth was divided into six classes; 0 to 2 m, 2 to 4 m, 4 to 6 m, 6 to 8 m, 8 to 10 m, >10 m. We investigated the vegetation in this area to measure the influence of groundwater table depth on plant diversity and species ecological niche. The results indicated that plant diversity was highest at the 2 to 4 m groundwater table depth, followed by that at 4 to 6 m, and then that at 0 to 2 m. When the groundwater depth dropped to below 6 m, species diversity decreased dramatically, and the slope of Hill’s index tended to level off. The ecological niche of the major species in this area initially expanded as the groundwater level dropped. The widest niche appeared at the 4 to 6 m groundwater table depth and gradually narrowed with deepening groundwater. Ecological niche analysis also revealed that the 4 to 6 m groundwater table depth was associated with the lowest degree of niche overlap and the richest variety of species. Our findings indicate that in the lower reaches of the Tarim River, the groundwater table depth must be a minimum of 6 m for vegetation restoration; it should be maintained at 2 to 4 m in the vicinity of the water path, and at 4 to 6 m for the rest of this arid area.
KeywordsPlant diversity Ecological niche breadth Ecological niche overlap Lower reaches of Tarim River Groundwater table depth
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- Gries, D., Zeng, F., Foetzki, A., Arndt, S. K., Bruelheide, H., Thomas, F. M., et al. (2003). Growth and water relations of Tamarix ramosissima and Populus euphratica on Taklamakan desert dunes in relation to depth to a permanent water table. Plant Cell & Environment, 26, 725–736.CrossRefGoogle Scholar
- Levins, R. (1968). Evolution in changing environments: Some theoretical explorations. Princeton: Basin Books.Google Scholar
- Liu, J. Z., Chen, Y. N., Chen, Y. J., Zhang, N., & Li, W. H. (2005). Degradation of populus euphratica community in the lower reaches of the Tarim River, Xinjiang, China. Journal of Environmental Sciences, 17(5), 740–747.Google Scholar
- Margalef, R. (1958). Information theory in ecology. General Systems, 3, 36–71.Google Scholar
- Robbins, B. D., & Bell, S. S. (2000). Dynamics of a subtidal seagrass landscape: Seasonal and annual change in relation to water depth. Ecology, 81, 1193–1205.Google Scholar
- Shafroth, P. B., Stromberg, J. C., & Pattern, D. T. (2002). Riparian vegetation response to altered disturbance and stress regimes. Ecological Society of America, 12, 107–123.Google Scholar
- Shannon, C. E., & Weiner, W. (1949). The mathematical theory of communication. Unknown Distance Function. Urbana: Illinois Press.Google Scholar
- Song, Y. D., & Fan, Z. L. (2000). The water resource and ecology in Tarim River, China. Xinjiang: People Press, Urumqi (In Chinese with English summary).Google Scholar
- Zhou, H. Z., Yu, X. D., Luo, T. H., & He, J. J. (2000). How does species diversity change? Spatio-temporal patterns and scales. Chinese Biodiversity, 8(3), 325–326 (in Chinese).Google Scholar