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山鸡椒水分及氮素利用效率性别特异性动态 预览

Dynamic Patterns of Sex-Specific Difference of Water and Nitrogen Use Efficiency in Litsea cubeba
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摘要 【目的】以雌雄异株山鸡椒为研究材料,分析雌雄植株在生殖生长过程中水分及氮素利用策略的性别特异性动态变化规律,以期为雌雄异株植物资源分配动态变化机制提供理论依据。【方法】测定雌雄植株在开花后105~165天共5个时期叶片养分含量(碳含量、氮含量、碳氮比)、稳定碳同位素组成(δ^13C)、稳定氮同位素组成(δ^15N),并分析其动态变化规律。【结果】1)雌雄株叶片δ^13C平均值分别为-29.38‰和-28.08‰。性别和发育时期对雌雄株叶片δ^13C值影响均显著,5个时期雌株δ^13C值均显著低于雄株;且随发育进程雌雄植株δ^13C值均不断下降。2)雌雄株叶片δ^15N平均值分别为1.90‰和2.95‰。性别和发育时期对雌雄株叶片δ^15N值均有极显著影响,开花后105~150天(即雌株果实中精油及柠檬醛含量快速积累期)雌株δ15N值显著低于雄株;随着发育进程,雌雄株叶片δ^15N值均表现出双峰变化趋势,双峰出现在开花后105天和135天,雌株叶片δ^15N在开花后120天达到最低值,雄株叶片在开花后165天时达到最低值。3)雌雄株叶片碳含量平均值分别为49.44%和49.28%。开花后105天和120天,雌株叶片C含量高于雄株叶片C含量,开花后135~165天(果实精油快速积累期到稳定期),雌株叶片C含量低于雄株。雄株叶片C含量随发育进程显著升高,而雌株叶片C含量在不同时期无显著差异。4)雌雄株叶片N含量平均值分别为1.71%和1.51%。性别对N含量影响显著,雄株叶片N含量均低于雌株(除开花后135天)。5)雌雄株叶片C/N平均值分别为29.15和33.72。性别对叶片碳氮比影响显著,雌株C/N值在不同发育时期均小于雄株,但发育时期对其无显著影响;随着发育时期推进,雄株C/N值下降程度高于雌株。6)雌雄植株叶片δ^13C与N含量以及δ^13C与δ^15N之间均无显著相关性。【结论】山鸡椒雌雄植株在养分含量、水分及氮素利用策略存在� 【Objective】 In this study, dynamic patterns of sex-specific water and nitrogen use efficiencies in male and female plants of dioecious Litsea cubeba were analyzed.The result provides a theoretical basis for understanding of the dynamic changes of resource allocation of dioecious plants.【Method】 The nutrient content (carbon and nitrogen content, the ratio of carbon and nitrogen (C/N)), water use efficiency, as inferred from leaf carbon isotope composition (δ^13C), and nitrogen use, estimated by leaf nitrogen isotope composition (δ^15N) were measured in male and female plants during 105 and 165 days after flowering (DAF).【Result】 1) The mean leafδ^13C values of female and male plants were -29.38‰ and -28.08‰.Leafδ^13C values of both male and female plants were significantly affected by sex and development period.Leafδ^13C values of the female plants were all lower than the male plants for the five periods.Leafδ^13C values of both male and female plants were constantly decreased during the development period.2) The mean leafδ^15N values of the female and male plants were 1.90‰ and 2.95‰.Sex and development period also had significant effect on leafδ^15N values of male and female plants.Leafδ^15N values of the female plants were lower than the male plants from 105 to 150 DAF (rapid accumulation stage of oil and citral contents).δ^15N values showed double peaks during 105 and 165 DAF, and the largest values were appeared at 105 and 135 DAF.Meanwhile,δ^15N value of the female plant was lowest at 120 DAF, while the lowest value was appeared in the male plant at 165 DAF.3) The mean leaf carbon contents of the female and male plants were 49.44% and 49.28% respectively.Leaf carbon contents were higher in the female plant than in the male plant at 105 and 120 DAF, while lower in the female plant than in the male plant from 135 DAF to 165 DAF (from accumulation stage to stable stage of oil content).The leaf carbon contents significantly increased with time in the male plant, but not significant
作者 高暝 陈益存 吴立文 汪阳东 Gao Ming;Chen Yicun;Wu Liwen;Wang Yangdong(Institute of Subtropical Forestry, Chinese Academy of Forestry Hangzhou 311400)
出处 《林业科学》 EI CAS CSCD 北大核心 2019年第4期62-68,共7页 Scientia Silvae Sinicae
基金 国家自然科学基金项目(31700523)。
关键词 雌雄异株 山鸡椒 水分利用效率 氮素利用效率 dioecy Litsea cubeba water use efficiency nitrogen use efficiency
作者简介 通信作者:汪阳东.
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