施肥对鼠尾草属2种外来植物资源分配的影响  

Effects of fertilization on resource allocation of two exotic plants of Salvia

作　　者：张燕婷 方筱 郭荣[1,2] 曾盛琪 闫晓慧[1] 胡世俊[2] ZHANG Yanting;FANG Xiao;GUO Rong;ZENG Shengqi;YAN Xiaohui;HU Shijun(Key Laboratory of Forest Disaster Early Warning and Control of Yunnan Province,Southwest Forestry University,Kunming 650224,China;Key Laboratory of Biodiversity Conservation of the State Forestry and Grassland Administration,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学云南省森林灾害预警与控制重点实验室,昆明650224 [2]西南林业大学国家林草局生物多样性保育重点实验室,昆明650224

出　　处：《西北植物学报》2024年第9期1395-1401,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目(32160378);云南省高层次人才项目(YN-WR-QNBJ-2018-300)。

摘　　要：【目的】比较鼠尾草属2种外来植物一串红和椴叶鼠尾草在不同营养条件下生长、繁殖、防御方面资源分配策略,了解椴叶鼠尾草的入侵机制。【方法】采用盆栽试验法,以2种外来植物为材料,设置对照(0 g)、低肥(2 g)和高肥(4 g)3个营养梯度,测定生长、繁殖指标,物理防御、化学防御指标和营养物质含量。【结果】(1)2种植物的生物量、营养物质含量和花的化学防御能力均为高肥处理>低肥处理>对照,叶的物理和化学防御能力为高肥处理<低肥处理<对照。(2)在相同条件下,椴叶鼠尾草的株高、叶片数、花数、总生物量高于一串红,将43%~52%的总生物量分配给有性生殖,叶的物理和化学防御指标也高于一串红,但花的化学防御指标和营养物质含量比一串红低。椴叶鼠尾草叶的化学防御物质含量比花高,一串红则相反。【结论】2种植物在资源充足的条件下会减少叶防御投入,增加生长繁殖的投入。椴叶鼠尾草侧重叶的防御,一串红侧重花的防御。[Objective]Comparison of resource allocation strategies in terms of growth,reproduction and defense under different nutrient conditions between two exotic plants of the Salvia tiliifolia and Salvia splendens,to understand the invasion mechanism of S.tiliifolia.[Methods]By pot experiments,two exotic plants of Salvia were chosen as experimental materials.Three nutrient gradients[control(0 g),low fertilizer(2 g),and high fertilizer(4 g)]were established.Indexes of growth,reproduction,physical defense,chemical defense,and content of nutrient substances were measured.[Results](1)The biomass,nutrient content,and chemical defense capability of flowers in both species followed the order:High fertilization>low fertilization>control,while the physical and chemical defense capabilities of leaves fol lowed the opposite order:Control>low fertilization>high fertilization.(2)Under the same condition,S.tiliifolia exhibited higher plant height,leaf number,flower number,and total biomass compared to S.splendens,allocating 43%-52%of its total biomass to sexual reproduction.The physical and chemi-cal defense indices of leaves were also higher in S.tiliifolia than in S.splendens,but the chemical de-fense indices of flowers and nutrient content were lower.The leaf of S.tiliifolia showed higher content of chemical defense substances than flower,and the S.splendens was the opposite.[Conclusion]Under conditions of abundant resources,both species reduce investment in leaf defense and increase investment in growth and reproduction.S.tiliifolia focuses on leaf defense,while S.splendens focuses on flower de-fense.

关 键 词：外来植物 椴叶鼠尾草 一串红 资源分配 土壤营养 

分 类 号：Q945.79[生物学—植物学]