期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 653, 期 -, 页码 1204-1212出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.11.050
关键词
Streams; Salt; Drought; Aquatic hyphomycetes; Decomposition
资金
- FCT, within the POCH - Human Capital Operating Programme [SFRH/BPD/94820/2013, SFRH/BD/119133/2016]
- European Social Fund
- MCTES national funds
- project FunctionalStreams - French National Agency [ANR-14-CE01-0009-01]
- FCT/MEC through national funds [UID/BIA/04004/2013]
- FEDER, within the PT2020 Partnership Agreement
- COMPETE 2020
- project ReNATURE - Valorization of the Natural Endogenous Resources of the Centro Region [Centro-01-0145-FEDER-000007]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/119133/2016] Funding Source: FCT
Human-induced salinization of freshwaters constitutes a growing global problem, whose consequences on streams functioning are largely unknown. Climate change projections predict enhanced evaporation, as well as an increase in extreme events and in variability of precipitation. This will result in more frequent, extended and severe drought periods that may aggravate water salinization of streams and rivers. In this study we conducted a microcosm experiment to assess the combined effects of three drought regimes - abrupt (AD), slow (SD) and very slow transition to dryness (VSD) - and three levels of salinization (0, 4, 6 g L-1 NaCl) on microbial-mediated oak leaf decomposition over ten weeks. Salinization did not affect mass loss and associated microbial respiration of colonized oak leaves but significantly reduced the biomass and eliminated the sporulating capacity of fungi. Desiccation negatively affected leaf decomposition regardless of regime. Even though microbial respiration did not react to the different treatments, lower fungal biomass, diversity, and conidial production were observed under AD; for fungal biomass these effects were amplified at higher salt concentrations (particularly at 6 g L-1). Our results indicate that effects of leaf litter desiccation depend on the rate of transition between wet and dry conditions and on the level of salt in the water. The two factors jointly affect decomposer survival and activity and, by extension, the dynamics of detrital food webs in streams. (c) 2018 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据