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Growth and competition between a native leguminous forb and an alien grass from the Cerrado under elevated CO2
Austral Ecology ( IF 1.6 ) Pub Date : 2021-02-19 , DOI: 10.1111/aec.13006
Amanda Cristina Gonçalves Oliveira 1 , Patrick Moreira Rios 2 , Eduardo Gusmão Pereira 2 , João Paulo Souza 2
Affiliation  

The increase in atmospheric CO2 concentration ([CO2]) due to climate change may alter the composition of communities and the functioning of ecosystems. Owing to greater nitrogen use efficiency, leguminous plants present more effective responses to increasing [CO2] than non-legumes. The objective of this study was to evaluate the morphophysiological and growth responses of two species from the Cerrado, a native C3 herbaceous legume (Stylosanthes capitata Vogel.) and an invasive C4 grass (Melinis minutiflora P. Beauv) growing alone or in competition, in ambient (350 ppm) and high (1000 ppm) [CO2]. Competition with S. capitata reduced leaf development and dry matter production in M. minutiflora individuals, regardless of [CO2]. Stylosanthes capitata increased root system growth under high [CO2] and competition. This change allows greater soil exploitation, decreasing nutrient limitation to S. capitata development. The leguminous species S. capitata showed advantages in the competition for resources under high [CO2] concerning the invasive grass. Although invasive C4 species are initially better in the colonisation of the invaded areas, the C3 native species of Cerrado may adjust morphophysiological traits when growing at high [CO2] and develop strategies that enable it to more effectively compete for resources.

中文翻译:

在二氧化碳升高的条件下,本地豆科植物与来自塞拉多的外来草之间的生长和竞争

气候变化导致大气 CO 2浓度 ([CO 2 ])的增加可能会改变群落的组成和生态系统的功能。由于更高的氮利用效率,豆科植物比非豆科植物对增加 [CO 2 ]表现出更有效的反应。本研究的目的是评估来自 Cerrado 的两种物种的形态生理学和生长反应,一种是本地 C 3草本豆科植物(Stylosanthes capitalta Vogel.)和一种侵入性 C 4草(Melinis minutiflora P. Beauv),它们单独生长或在竞争中生长, 在环境 (350 ppm) 和高 (1000 ppm) [CO 2 ] 中。与无论 [CO 2 ]如何,S. capita 都会降低M. minutiflora个体的叶片发育和干物质产量。柱花草在高 [CO 2 ] 和竞争下促进根系生长。这种变化允许更大的土壤开发,减少对S. capita发展的养分限制。豆科植物S.capitata在高[CO 2 ]下入侵草类资源竞争中表现出优势。虽然入侵的 C 4物种最初在入侵区域的定殖方面表现更好,但 C 3Cerrado 的本地物种在高 [CO 2 ] 下生长时可能会调整形态生理特征,并制定策略使其能够更有效地竞争资源。
更新日期:2021-02-19
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