氮素形态对薄壳山核桃生长生理特性的影响

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中图分类号：S794 文献标志码：A 文章编号：1000-2006（2026）01-0160-10

Abstract ： 【Objective】Ammonium nitrogen（ NH4+ -N） nitrate nitrogen （ NO3- -N）are the two primary organic nitrogenmsabsorbedbyplants playcrucialroles plant growthdevelopment.Screng theoptimalnitrogen mratio pecan（Caryailoensis）growthcan provideatheoretical basis improvg its nitrogen useeffciency. 【Method】The experiment used 14-year-old pecan trees the C .illoensis‘Pawnee’cultivar asplant materials.Six treatments were established with NO -N to NH4+ -N mass ratios 100：0 （T1），72：25（T2）， 50：50 （T3）， 25：75 （2 3 （T4）， 0：100 （T5）， a no-nitrogen fertilizer control（CK）.Variance analysis，correlation analysis， prcipal component analysis wereconductedonthe growth physiological characteristics pecan under diferent nitrogen m treatments toprelimarilydetermetheoptimalnitrogen mratio.【Result】Theresultsshowedthatthe T2treatment significantly creasedthecontentschlorophylla，chlorophyllb，totalchlorophyllpecanleaves，aswellasthe free amoacidcrude fatcontents the kermels.Under T3 treatment，tree heightdiameterat breast height growth weresignificantlyenhanced，ammoniumnitrogen content rootskernelswassignificantlyreduced，while ammonium nitrogen content leaves was significantly creased.T4 treatment significantly creased the soluble sugar content roots leaves，aswellasthesoluble protefre amo acidcontents both roots kernels.The T5 treatmentsignificantlycreasedthesolublesugarcontent thekernels.Corelationanalysisdicatedpositive relationships betweenthemajority themeasured parameters pecan.Prcipalcomponentanalysiscomprehensive evaluation revealedthat the T4 treatment wasmostconducive to promotg thegrowth development pecan. 【Conclusion】Throughtheanalysis growthphysiologicalcharacteristics，correlationanalysis，prcipal component analysis pecanunder diferent nitrogen mratio treatments，itwas foundthat the T4 treatment had the bestpromotg efectonthegrowthdevelopment pecan.Thisprovidesatheoreticalfoundation improvg nitrogen use efficiency pecan.

Keywords：Carya iloensis（pecan）；nitrogen ms；growth physiological characteristics；nitrogen usefficie

薄壳山核桃（Caryailloensis，pecan）为胡桃科山核桃属植物，原产于美国密西西比河流域[1]薄壳山核桃油脂含量（质量分数）高达 70% ，其中90% 为不饱和脂肪酸，是著名的干果油料树种之_[2]。（剩余20339字）