The water adaptation strategy of extremely small population Taxus cuspidata is the basis of its response to climate change, and studies based on isotopes are still blank. By measuring the δD and δ18O values of plant xylowater and soil water, direct correlation method and multiple linear mixing model (Iso-Source) were used to analyze the water sources and water use strategies of Taxus cuspidata. The results showed that: the fluctuation range of soil water content in 0-40 cm soil layer of Taxus cuspidata was 32.69% to 54.29%, and the trend was first increased and then decreased; the fluctuation range of soil water content in 40-100 cm soil layer was 22.55% to 25.73%, and the fluctuation range was small. The soil water content in the 0-40 cm soil layer was higher than that in the 40-100 cm soil layer. The δD and δ18O values of soil water from 0 to 100 cm of Taxus cuspidata were -84.26‰ to -52.17‰ and -11.69‰ to -7.49‰, respectively, and decreased gradually with the increase of soil depth. The δD and δ18O values of soil water changed sharply in 0-40 cm soil layer, but changed little in 40-100 cm soil layer. The main water source of Taxus cuspidata was 0-40 cm soil water, and the utilization rate was 89.55%, and the utilization rate of 40-70 cm and 70- 100 cm soil water was 5.15% and 5.30%, respectively. This study reflects the water adaptation of Taxus cuspidata under the background of global warming, and the results can provide scientific basis for assessing the stability of Taxus cuspidata ecosystem under future climate change.
由图3可知,东北红豆杉木质部水的δD和δ18O值分别为-71.20‰和-9.46‰。东北红豆杉土壤水的δD和δ18O值随土壤深度的增加呈逐渐减少的变化趋势,0~100 cm土层土壤水的δD和δ18O值分别分布在-84.26‰~-52.17‰和-11.69‰~-7.49‰。其中,0~40 cm 土层土壤水的δD和δ18O值变化较为剧烈,分别在-84.26‰~-52.17‰和-11.69‰~-7.49‰波动,随土层深度增加有明显减小趋势。40~100 cm土层土壤水的δD和δ18O值分别在-83.83‰~-80.09‰和-10.97‰~-10.30‰波动,数值变化幅度较小,趋于稳定。
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