在eCO2环境下,黄花双模andra wilsonii幼树茎叶生物量分配的变化可能会对这一濒危物种造成危害

IF 1.1 4区 生物学 Q4 ECOLOGY Plant Species Biology Pub Date : 2023-11-03 DOI:10.1111/1442-1984.12440
Marina Efigenia Gonçalves, Geane Cristina Eugenio Viegas, Nayara Magry Jesus Melo, João Paulo Souza
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引用次数: 0

摘要

气候变化是生态系统面临的主要威胁之一,影响着生物多样性和生态系统服务。这些变化与大气中二氧化碳浓度([co2])的增加有关。本研究旨在研究[CO 2]如何影响Dimorphandra wilsonii (Dimorphandra wilsonii)的叶绿素a荧光、营养生长、生物量生产和根瘤数(NRN)。该研究在6个有两种CO 2水平的开顶室中进行,一种是升高[CO 2] (eCO 2,717±77 ppm),另一种是环境[CO 2] (aCO 2,539±42 ppm)。我们每周监测植物生长情况,在实验结束时,我们测量叶绿素a荧光和生物量产量。eCO 2处理下双地凤属植物(p <0.05)平均叶干质量、平均叶面积和更低(p <0.05)根冠比高于aco2处理下植株。较大的空中生物量分配有助于最大化光合性能,但也可能导致基部老叶被枝条上的远端新叶自遮阳。这种调整在争夺光的竞争中是有利的;然而,这将不利于地下资源的竞争(如水和养分),这可能导致抗旱性下降。同时,这种调整也不利于威尔森氏菌在季节性气候环境中与入侵草竞争。因此,气候变化情景下[CO 2]的增加和干旱期的增加可能会对黄松幼苗在其自然发育区的建立产生负面影响,从而使该物种的保护状况恶化。
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The change in the biomass allocation to stems and leaves in young plants of Dimorphandra wilsonii under eCO2 may harm this endangered species in native areas
Abstract Climate change is among the main threats to ecosystems, affecting biodiversity and ecosystem services. These changes are associated with increased atmospheric carbon dioxide concentration ([CO 2 ]). This study aimed to investigate how [CO 2 ] influences chlorophyll a fluorescence, vegetative growth, biomass production, and the number of root nodules (NRN) of Dimorphandra wilsonii , a critically endangered species. The study was conducted in six open‐top chambers with two CO 2 levels, at elevated [CO 2 ] (eCO 2 , 717 ± 77 ppm) and at ambient [CO 2 ] (aCO 2 , 539 ± 42 ppm). We monitored vegetative growth weekly, and at the end of the experiment, we measured chlorophyll a fluorescence and biomass production. Dimorphandra wilsonii plants under eCO 2 showed higher ( p < 0.05) average leaf dry mass, average leaf area, and lower ( p < 0.05) root/shoot ratio than plants under aCO 2 . The greater aerial biomass allocation contributes to maximizing the photosynthesis performance but could also result in the self‐shading of old basal leaves by new distal leaves on branches. This adjustment could be advantageous in the competition for light; however, it would be a disadvantage for below‐ground resource competition (such as water and nutrients), which could result in decreased drought resistance. Also, this adjustment would be unfavorable to D. wilsonii , which occurs in a seasonal climate environment competing with invasive grasses. Thus, it is possible that climate change scenarios with increases in [CO 2 ] and drought periods could negatively influence the establishment of young plants of D. wilsonii in their natural occurrence area, which could worsen the conservation status of the species.
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来源期刊
Plant Species Biology
Plant Species Biology 生物-生态学
CiteScore
2.70
自引率
14.30%
发文量
36
审稿时长
>12 weeks
期刊介绍: Plant Species Biology is published four times a year by The Society for the Study of Species Biology. Plant Species Biology publishes research manuscripts in the fields of population biology, pollination biology, evolutionary ecology, biosystematics, co-evolution, and any other related fields in biology. In addition to full length papers, the journal also includes short research papers as notes and comments. Invited articles may be accepted or occasion at the request of the Editorial Board. Manuscripts should contain new results of empirical and/or theoretical investigations concerning facts, processes, mechanisms or concepts of evolutionary as well as biological phenomena. Papers that are purely descriptive are not suitable for this journal. Notes & comments of the following contents will not be accepted for publication: Development of DNA markers. The journal is introducing ''Life history monographs of Japanese plant species''. The journal is dedicated to minimizing the time between submission, review and publication and to providing a high quality forum for original research in Plant Species Biology.
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