Elevated Concentrations of CO2 and Nitrogen Alter DOC Release and Soil Phenolic Content in Wetland Microcosms

IF 1.3 4区 环境科学与生态学 Q3 ECOLOGY
Chaeho Byun, Seon-young Kim, Hojeong Kang
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引用次数: 6

Abstract

ABSTRACT Physiological responses of plants to elevated carbon dioxide (CO2) and nitrogen (N) availability are ecologically important because of increased atmospheric CO2 concentrations and N enrichment in many ecosystems. Here, the effects of N availability on the responses of six wetland plant species to elevated CO2 levels are examined in terms of growth and root exudation. Six species of emergent plant species typically found in marshes were incubated under two levels of CO2 (370 and 740 ppm) and two levels of N (0 and 8.8 mg N L–1). Elevated CO2 did not affect shoot biomass, root biomass, and height significantly, regardless of N levels. The C/N ratio of plant species increased in response to elevated CO2 levels, but this effect varied by species. All species released higher amounts of dissolved organic carbon under elevated CO2 compared with ambient air conditions. This response was limited under low soil N concentrations. By contrast, phenolic content increased significantly with elevated CO2 under low-N treatment. The findings suggest that elevated CO2 is not responsible for biomass accumulation of emergent wetland plant species, but does elicit changes in the quantity and quality of root exudates, which are, in turn, dependent on N availability to plant species.
湿地微生态系统CO2、氮浓度升高对DOC释放和土壤酚类物质含量的影响
植物对二氧化碳(CO2)和氮(N)有效性升高的生理反应具有重要的生态学意义,因为在许多生态系统中大气二氧化碳浓度和氮富集增加。本文从生长和根系分泌物的角度研究了氮有效性对6种湿地植物对CO2浓度升高的响应的影响。在两种浓度的CO2(370和740 ppm)和两种浓度的N(0和8.8 mg N - 1)条件下,对6种沼泽中常见的新兴植物进行了培养。无论氮水平如何,CO2浓度升高对地上部生物量、根系生物量和株高的影响均不显著。植物物种的碳氮比随CO2浓度的升高而增加,但这种影响因物种而异。与环境空气条件相比,在二氧化碳浓度升高的情况下,所有物种释放的溶解有机碳量都更高。在低土壤氮浓度条件下,这种响应受到限制。低氮处理下,随着CO2浓度的升高,酚类物质含量显著增加。研究结果表明,CO2的升高并不是新兴湿地植物生物量积累的原因,但确实引起了根系分泌物数量和质量的变化,而根系分泌物的数量和质量又取决于植物物种的氮有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ecoscience
Ecoscience 环境科学-生态学
CiteScore
2.80
自引率
0.00%
发文量
13
审稿时长
>36 weeks
期刊介绍: Écoscience, is a multidisciplinary journal that covers all aspects of ecology. The journal welcomes submissions in English or French and publishes original work focusing on patterns and processes at various temporal and spatial scales across different levels of biological organization. Articles include original research, brief communications and reviews.
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