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Relationship of Water Potential for Some Dominant Plant Species in Ejin Oasis to Environmental Factors

Xiao Hong-liang

Abstract

Water potential for some dominant plant species in Ejin Oasis was analyzed by measurement of soil water potential, plant water potential. Water potential order in all species from the lowest to the highest was R. Soongoric T. Ramosissima, L, ruthenicum, S. alopecuroides P. Euphratica, H. ammodendron, P. Harmala K. Caspia C. caput-medusae. Generally, the diurnal variation of plant water potential for T. Ramosissima P. Euphratica had a \!V[WT] shape from May to July, whereas linear shape in September. The tree and shrub water potential showed high correlation with deeper soil water potential, and the herb water potential was correlated with shallower soil water potential. Results indicate that these species water potential were poorest correlated with air temperature.

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Key concepts: Populus euphratica, Haloxylon ammodendron, Tamarix, Shrub, Environmental science, Water potential, Soil water, Hydrology (agriculture)