基于氢氧稳定同位素技术的东北红豆杉水分来源

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关键词：极小种群；东北红豆杉；氢氧稳定同位素；水分来源；Iso-Source 中图分类号：S718.45；S791.49 文献标识码：A DOI：10.7525/j.issn.1006-8023.2025.06.006

Water Sources of Taxus cuspidata Based on Stable Hydrogen and Oxygen Isotopes Technique

HANLidong*，WO Xiaotang，DIAO Yunfei （Heilongjiang Ecology Institute，Harbin 15Oo81，China）

Abstract：Thewateradaptationstrategyof extremelysmallpopulation Taxus cuspidataisthebasisof itsresponsetoclimate change，and studies based on isotopes are still blank.By measuring the SD and 818O values of plant xylowater and soil water，direct corelation method and multiple linear mixing model （Iso-Soure）wereused to analyze the water sourcesand water use strategies of Taxus cuspidata.Theresults showed that：thefluctuation range of soilwater content in O-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 4O-1OO cm soil layer was 22. 55% to 25. 73% ，and the fluctuation range was small.Thesoil watercontent intheO-4Ocmsoil layer was higherthan thatinthe40-1OOcm soil layer.The SDand （20号 8180 values of soil water from O to 10O cm of Taxus cuspidata were -84 26‰ to -52 ： 17‰ and -11 69%oto -7 ： 49‰ ，respectively，and decreased gradually with the increase of soil depth． The SD and 818O values of soil water changed sharplyin O-40cm soil layer，butchangedlitlein 40-10Ocm soillayer.The main watersourceofTaxus cuspidata was 0-40 cm soil water，and the utilization rate was 89.55 % ，and the utilization rate of 4O-7O cm and 70- 100 cm soil water was5. 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 forassessingthe stabilityof Taxus cuspidata ecosystem under future climate change.

KeyWords：Extremely small populations； Taxus cuspidata； stable hydrogen and oxygen isotopes；water source； Iso-Source

0 引言

近年来，全球变暖加剧，极端天气频发，改变了全球降水格局，群落的水分环境也随之发生变化，进而影响到植物生长[1-2]。（剩余18183字）