The effect of groundwater depth on the δ13C value of constructive species leaf in the lower reaches of the Tarim River

doi:10.11686/cyxb20140209

Abstract

Abstract: The δ¹³C values of Populus euphratica and Tamarix spp. in the lower reaches of the Tarim River were measured under different groundwater depth gradients and the effect of groundwater depth diversification on long-term water use efficiency was analyzed. This research provides a scientific basis for degraded ecosystem vegetation conservation and restoration in the lower reaches of the Tarim River. The δ¹³C value in P. euphratica leaves initially increased but then decreased as the groundwater depth varied from 2.4 to 9.1 m. P. euphratica was likely to reduce aboveground biomass to adapt to the intensified drought at 9.1 m. The δ¹³C values in Tamarix spp. leaves gradually increased with increasing groundwater depth, indicating that water use efficiency and the width of the adapted groundwater depth increased as the groundwater depth become deeper. The δ¹³C values of P. euphratica and Tamarix spp. leaves were compared under the conditions of the same groundwater depth and It was found that drought resistance of P. euphratica was weaker than that of T. chinensis with increasing groundwater depth. Under conditions of different groundwater depths, the δ¹³C values of P. euphratica and Tamarix spp. leaves were compared. P. euphratica used different strategies at different groundwater depths to adapt to arid environments, while Tamarix spp. resisted the intensified drought by increasing water use efficiency.

CLC Number:

Q945.17

REN Zhi-guo, CHEN Ya-peng, LI Wei-hong, LIU Shu-bao. The effect of groundwater depth on the δ¹³C value of constructive species leaf in the lower reaches of the Tarim River[J]. Acta Prataculturae Sinica, 2014, 23(2): 76-82.

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The effect of groundwater depth on the δ¹³C value of constructive species leaf in the lower reaches of the Tarim River

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