南美蟛蜞菊改变资源分配应对CO_(2)升高对其竞争力的负影响  

Response of Wedelia trilobata to the Negative Impact of Elevated Carbon Dioxide Concentration on Its Competitiveness by Changing Resource Allocation

作　　者：杨洪宇 夏维康 杨彬 黄致云 祁珊珊 戴志聪 杜道林 YANG Hong-yu;XIA Wei-kang;YANG Bin;HUANG Zhi-yun;QI Shan-shan;DAI Zhi-cong;DU Dao-lin(Jiangsu University, School of the Environmental and Safety Engineering, Zhenjiang, Jiangsu Province 212013, China;Jiangsu University, School of the Agricultural Engineering, Zhenjiang, Jiangsu Province 212013, China;Jiangsu Collaborative Innovation Center of Technologyand Material of Water Treatment, Suzhou University of Science and Technology, Suzhou, Jiangsu Province 215009, China)

机构地区：[1]江苏大学,环境与安全工程学院,江苏镇江212013 [2]江苏大学,农业工程学院,江苏镇江212013 [3]苏州科技大学,江苏水处理技术与材料协同创新中心,江苏苏州215009

出　　处：《草地学报》2022年第2期356-361,共6页Acta Agrestia Sinica

基　　金：江苏省自然科学基金(BK20211321);国家自然科学基金(32171509和32071521);江苏省博士后基金(2021K160B);江苏大学科研立项(Y19A032)资助。

摘　　要：大气二氧化碳(Carbon dioxide,CO_(2))浓度正随着人类活动向着前所未有的浓度积累。作为光合作用的重要底物,CO_(2)的增加会对植物生长及竞争能力产生影响,因此,研究未来CO_(2)浓度升高背景下植物竞争力的变化对预测未来全球变化背景下植物群落演替及外来植物入侵具有重要意义。本研究以人工气候培养箱控制CO_(2)浓度,探究了入侵克隆植物南美蟛蜞菊(Wedelia trilobata)与本地蟛蜞菊(W.chinensis)的生长和竞争对CO_(2)浓度增加的响应。结果表明,相比于本地蟛蜞菊而言,升高CO_(2)浓度减少了南美蟛蜞菊的生物量积累,并显著影响了茎的伸长(P=0.042),虽然混合种植中南美蟛蜞菊的茎长未表现明显差异,但竞争消除了CO_(2)浓度升高引起的茎长缩短。综合来看,尽管升高CO_(2)浓度减弱了南美蟛蜞菊对本地蟛蜞菊的竞争力,但南美蟛蜞菊可以通过改变在竞争中资源分配策略,使其将更多的资源用于茎段的伸长,主动向外拓张以占领更多的空间。Atmosphere CO_(2) concentration is accumulating to an unprecedented concentration with human activities.The increase of CO_(2),an important substrate for photosynthesis,will affect plant growth and competitiveness.Therefore,it’s of great importance to explore the changes in alien plant competitiveness under the background of increasing CO_(2) concentration in the future.In this study,CO_(2) concentrations controlled by an artificial climate incubator were used to measure the changes in the competitiveness of invasive Wedelia trilobata in competition with the congenetic native W.chinensis.The results showed that,compared with W.chinensis,elevated CO_(2) reduced the biomass accumulation of W.trilobata,and significantly reduced the elongation of the stem(P=0.042).Although the stem length of the W.trilobata in mixed treatment did not show a significant difference,the competition eliminated the shortening of the stem length caused by the increase of CO_(2) concentration.On the whole,invasive plant W.trilobata could change the resource allocation to respond to a negative impact,caused by the increase of CO_(2) concentration,on its competitiveness,resulted in that more resources will be used for stem elongation to occupy more areas.

关 键 词：植物入侵 二氧化碳 资源分配 全球变化 

分 类 号：S451.1[农业科学—植物保护]