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1、第32卷第5期河北农业大学学报Vol.32No.52009年9月JOURNALOFAGRICULTURALUNIVERSITYOFHEBEISep.2009www.grain17.com文章编号:1000-1573(2009)05-0045-06土壤水势对桃树几个生理指标变化的影响贺军奇,赵宝峰¹(长安大学环境科学与工程学院,陕西西安710054)摘要:土壤水势是描述土壤干旱程度及土壤水分对植物有效性的重要指标。通过在不同土壤水势条件下,测定桃树光合速率、蒸腾速率以及叶片水分利用效率,分析了不同土壤水势下各个生理指标随时间的变化规律。结果表明:桃树在1d内光合呈双峰变化规律,
2、具有明显的/午休0现象,蒸腾速率变化与光合变化特征相似,也呈双峰变化规律,土壤水势过高并不利于桃树对水分的利用,当土壤水势维持在-60~-40kPa之间时,桃树叶片光合速率、平均蒸腾速率以及水分利用效率相对较高。综合分析表明,土壤水势控制在-60~-40kPa时,桃树各生理指标变化均维持较高水平,有利于桃树生长。关键词:土壤水势;桃树;光合速率;蒸腾速率中图分类号:S662.1文献标识码:AResearchontheimpactsofsoilwaterpotentialonafewphysiologicalindicatorsofpeachtreeHEJun-qi,ZHAOB
3、ao-feng(SchoolofEnvironmentalScience&Engineering,Chang.anUniversity,Xi.an710054,China)Abstract:Soilwaterpotentialisanimportantindicatorthatrepresentstheextentofsoilmois-tureandeffectivenessofwateruse.Inthispaper,themeasurementofpeachtreephotosynthe-sis,transpirationrates,aswellasleafwaterus
4、eefficiencywereidentifiedindifferentsoilwa-terpotential.Furthermore,analysisofthevarietyofphysiologicalindicatorswithtimeindif-ferentsoilwaterpotentialwasconducted.Theresultsrevealedthatthelawofphotosynthesisofpeachtreeinonedaypresentedbimodalchangeslikeakindofobviously"snap"statement,andch
5、angesoftranspirationratewassimilarwiththeonesofphotosyntheticcharacteristics.Inaddition,highsoilwaterpotentialwasnoteffectiveintermsofwaterabsorption.Whilesoilwaterpotentialwasmaintainedbetween-60kPaand-40kPa,photosyntheticrate,transpirationrateandtheaveragewateruseefficiencyofpeachleafwere
6、relativelyhigh.Atlast,bycompre-hensiveanalysis,theresultssuggestedthatwhenthesoilwaterpotentialwascontrolledbe-tween-60kPaand-40kPa,somephysiologicalindexesofpeachtree,suchasphotosynthesisrate,transpirationrateand,etc,couldarriveatahigherleveltobenefitthegrowthofpeachtrees.Keywords:soilwate
7、rpotential;peachtree;photosynthesisrate;transpirationrate土壤水分变化是影响植物生理及形态指标变化土壤水分更具代表性,因为土壤水势是土壤水分和[1-3]的关键因素,在描述土壤干旱程度方面,土壤水势比土壤质地共同作用的函数。当因土壤水分变化¹收稿日期:2008-12-19基金项目:/干旱半干旱地区水文生态与水安全学科创新引智基地0(B08039).作者简介:贺军奇(1978-),男,陕西省澄城县人,博士,讲师,主要从事节水灌溉新技术研究.E-mail
