模拟氮沉降对木荷和卷荚相思种子萌发的影响
Effects of simulated nitrogen deposition on seed germination of Schima superba and Acacia cincinnata
[目的]研究氮沉降对不同林木种子萌发的影响,旨在为南方森林的经营管理提供参考。[方法]以木荷和卷荚相思为试验材料,采用室内试验,选择 2,6和 12 g/L硝态氮(KNO3)、铵态氮((NH4)2SO4)、混合氮(NH4NO3)进行氮沉降模拟试验,以蒸馏水为对照(CK),测定各处理木荷和卷荚相思种子的发芽率、相对发芽率、发芽指数、活力指数和发芽抑制率,在此基础上采用主成分分析对不同处理对种子萌发影响进行综合评价。[结果]随着KNO3、(NH4)2SO4、NH4NO3 3种氮源质量浓度的升高,木荷和卷荚相思种子的发芽率、发芽指数均呈下降趋势,表现为"低促高抑"现象,而发芽抑制率提高。同一氮源下,不同质量浓度对木荷和卷荚相思种子萌发的促进作用均为 2 g/L>6 g/L>12 g/L;同一质量浓度下,当氮源为(NH4)2SO4时,其最能促进木荷和卷荚相思种子萌发。主成分分析结果显示,在木荷中主成分 1以及卷荚相思中主成分 1 和主成分 2 能够反映原始变量 80%以上的信息,因此选择以上主成分对不同处理进行综合排名,结果在木荷和卷荚相思种子各处理中综合排名第一的都为 2 g/L(NH4)2SO4处理。[结论]当质量浓度为 2～12 g/L 时,3种氮源对 2种树种种子萌发影响有差异,但最适宜木荷和卷荚相思种子萌发的处理均为 2 g/L(NH4)2SO4。
[Objective]To study the effects of nitrogen deposition on seed germination of different trees in order to provide reference for forest management in southern China.[Method]Schima Superba and Acacia cincinnata were used as test materials.In laboratory experiments,2,6,12 g/L nitrate nitrogen(KNO3),ammonium nitrogen((NH4)2SO4)and mixed nitrogen(NH4NO3)were selected for nitrogen sedimentation simulation test.Distilled water was used as control(CK).The germination rate,relative germination rate,germination index,vitality index and germination inhibition rate of the seeds of Schima superba and Acacia cincinnata were determined.On this basis,principal component analysis was used to comprehensively evaluate the effects of different treatments on seed germination.[Result]With the increase of nitrate nitrogen(KNO3),ammonium nitrogen((NH4)2SO4)and mixed nitrogen(NH4NO3),the germination rate and germination index of Schima superba and Acacia cincinnata seeds showed a downward trend,showing a phenomenon of"low promotion and high inhibition",while the germination inhibition rate was generally improved.Under the same nitrogen source,the promoting effects of different mass concentrations on seed germination of Schima superba and Acacia cincinnata were 2 g/L>6 g/L>12 g/L.Under the same mass concentration,the seed germination of Schima superba and Acacia cincinnata was best promoted when nitrogen source was(NH4)2SO4.The results of principal component analysis showed that one principal component(germination rate)of Schima superba and two principal components(germination rate and germination index)of Acacia cincinnata were selected for comprehensive ranking.The comprehensive ranking of seeds of Schima superba and Acacia cincinnata seeds in each treatment was 2 g/L(NH4)2SO4.[Conclusion]When the mass concentration was 2-12 g/L,the effects of three nitrogen sources on seed germination of the two species were different,but the most suitable treatment for seed germination of Schima superba and Acacia cincinnata was 2 g/L(NH4)2SO4.
李成珺;赖慧捷;范辉华;林智榕;戴渊;刘爱琴;
福建农林大学 林学院,福建 福州 350002##国家林业局杉木工程技术研究中心,福建 福州 350002;福建农林大学 林学院,福建 福州 350002##国家林业局杉木工程技术研究中心,福建 福州 350002;福建省林业科学研究院,福建 福州 350012;福建农林大学 林学院,福建 福州 350002##国家林业局杉木工程技术研究中心,福建 福州 350002;福建农林大学 林学院,福建 福州 350002##国家林业局杉木工程技术研究中心,福建 福州 350002;福建农林大学 林学院,福建 福州 350002##国家林业局杉木工程技术研究中心,福建 福州 350002;
Schima superba Acacia cincinnata seed germination nitrogen deposition
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