Alder stands promote N-cycling but not leaf litter mass loss in Mediterranean streams flowing through pine plantations

Forest Ecology and Management, Journal Year: 2023, Volume and Issue: 542, P. 121072 - 121072

Published: May 19, 2023

During the last century, abandonment of traditional dryland farming and pastures in Mediterranean basin promoted development ambitious afforestation programs causing a drastic transformation landscape. Afforestation were usually accomplished without considering potential ecological impacts on recipient ecosystems. Forest streams rely terrestrial organic detritus, so their functioning conservation status can be altered by changes riparian forest biodiversity composition. However, influences conifer plantations particular stream are still unclear, possibly because presence multiple species or other zones may act as buffers such effects. Here, means field experiment, we assessed whether black alder zone and/or leaf litter within mitigate exerted pine ecosystem functioning. We found (i) that functionally similar but differed water N concentrations; (ii) no differences mas loss between types, higher total mass those mixtures containing litter; (iii) losses (or lower gains) for all types alder. These results demonstrate microbial decomposers use either N, detritivores feed simultaneously resources contrasting quality to balance diet. Our study underscores effect even low-density cover promoting nutrient cycling moderate increases concentrations. suggest thinning combined with planting native deciduous alleviate effects streams.

Language: Английский

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Colonization and decomposition of litter produced by invasive Acacia dealbata and native tree species by stream microbial decomposers

Limnetica, Journal Year: 2022, Volume and Issue: 41(2), P. 1 - 1

Published: March 29, 2022

Changes in forest composition and litter inputs to streams due invasion by exotic tree species can affect the functioning of freshwater ecosystems. Acacia dealbata is an important invasive Mediterranean areas, often replaces native riparian vegetation. In this study, we assessed chemical characteristics three types produced Ac. (leaflets, flowers pods) leaf two with contrasting (Quercus robur Alnus glutinosa). We then decomposition associated microbial activity (i.e., overall metabolism as respiration, fungal growth biomass accumulation, reproduction aquatic hyphomycetes conidial production), community structure, laboratory microcosms. general, pods supported lower decomposed slower than all other types, their low nutrient concentrations high carbon:nutrients molar ratio. glutinosa fast, its relatively concentrations, ratios lignin concentration. leaflets Q. generally had similar rates, intermediate between those Al. litter, likely trade-offs structural secondary compound among types. Aquatic structure also differed For instance, lowest richness per sampling date, but dissimilarity replicates, total over incubation period was comparable that The forests quality into streams, potentially affecting decomposers, thus altering stream

Language: Английский

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Increasing inputs of invasive N‐fixing Acacia litter decrease litter decomposition and associated microbial activity in streams

Freshwater Biology, Journal Year: 2021, Volume and Issue: 67(2), P. 292 - 308

Published: Nov. 22, 2021

Abstract Nitrogen (N)‐fixing Acacia species are often aggressive invaders outside their native range. When invading riparian temperate forests, they can decrease tree diversity, alter the quality of litter inputs to streams and increase water N concentration. Although effects diversity nutrient enrichment on decomposition associated microbial decomposers have been widely studied, individual combined remain poorly understood, especially in flowing through forests invaded by species. Here, we assessed (species evenness) concentration litter, activity community structure decomposers. Litter Castanea sativa (C) melanoxylon (A) was enclosed fine‐mesh bags a total five evenness treatments (100%C, 75%C + 25%A, 50%C 50%A, 25%C 75%A 100%A), immersed stream forest (native stream) (invaded stream). rates decomposer differed among treatments, generally decreasing as proportion A . increased. considered individually, C did not differ treatments. For , whereas lower with higher or even proportions had (small) antagonistic streams. However, affected between streams, suggesting that be modulated were than stream, probably consequence former stream. magnitude small owing fact still oligothrophic range Overall, our results suggest increasing N‐fixing deciduous will affect activity, aquatic hyphomycete structure, most result decreases increases resulting from input (due contribution) into larger those concentration, thus overall decrease. These impacts possibly cycles food webs depend detritus, implications for functioning.

Language: Английский

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Canopy gaps control litter decomposition and nutrient release in subtropical forests

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Jan. 4, 2023

Abstract Aims Forest litter plays a critical role in the nutrient cycle of forest ecosystems, and changes microenvironment brought about by formation canopy gap affect decomposition release. However, pathway through which gaps influence release remains insufficiently understood, limits our understanding relationship between soil material cycling environmental heterogeneity gaps. Methods Here, we collected samples leaf branch Castanopsis kawakamii natural during for whole year, aiming to explore characteristics mass remaining non-gaps. Meanwhile, combined with factors, taxonomic diversity, microbial aimed reveal primary factors influencing litter. Results We found that leaves branches medium (50–100 m 2 ) was lower than other gaps, rate higher decomposition. Likewise, remaining, total carbon nitrogen release, enrichment were be asynchronous. Conclusions highlight caused sizes significantly influenced community activity diversity. Furthermore, asynchronous nature diversity depending on size affected both litter, thus comprehensively subtropical forests.

Language: Английский

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DECOMPOSITION OF THE INVASIVE ACACIA LONGIFOLIA IN A PERI-URBAN STREAM

Editora Artemis eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 93 - 104

Published: May 29, 2023

Language: Английский

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Effects of exotic fruit plants on leaf decomposition in Amazon: a study in aquatic microcosm

Limnology, Journal Year: 2022, Volume and Issue: 23(3), P. 455 - 464

Published: July 6, 2022

Language: Английский

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Effects of Acacia invasion on water quality, litterfall, aquatic decomposers, and leaf litter decomposition in streams

Freshwater Biology, Journal Year: 2024, Volume and Issue: 69(5), P. 705 - 723

Published: March 20, 2024

Abstract Small streams and their riparian vegetation are closely linked ecosystems. Thus, the invasion of native forests with non‐native species can impact stream We assessed effects broadleaf deciduous by evergreen, nitrogen‐fixing Acacia on seasonal variation relevant instream environmental variables, litterfall in area, aquatic decomposers, leaf litter decomposition, comparing three flowing through ( ) invaded central Portugal. Invaded flow composed (almost) monospecific stands trees. Litterfall area was sampled fabric traps sorted into five categories: (including phyllodes), flower, fruit seed, wood litter, other materials. Aquatic hyphomycete conidia suspended water were to assess concentration community composition. Leaf Quercus robur enclosed coarse‐mesh bags incubated decomposition rates associated macroinvertebrate density Samples from each variable collected monthly over 1 year. higher spring/summer when inputs, temperature, nutrient concentrations higher. In contrast, lower autumn/winter as they received less autumn than streams. structure changed, richness because lower. Macroinvertebrate shredder decomposing did not differ between streams, but may have artificially increased densities providing high quality food and/or refuges poor‐quality resources. Nevertheless, family Finally, Q. similar types, despite differences decomposer communities. Overall, changed quality, seasonality composition, communities (especially hyphomycetes). However, pronounced, suggesting that trophic levels be more resilient basal levels, or time/extent our strong enough affect macroinvertebrates processes. Instream strongly mediated changes inputs rather increases remained oligotrophic Simplification render them efficient coping additional changes. might mitigated maintenance a corridor vegetation. The protection non‐invaded galleries restoration ones could protect restore

Language: Английский

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The interaction between N, P in the overlying water of the reservoir Water-level fluctuation zone and submerged decomposition of Cynodon dactylon

E3S Web of Conferences, Journal Year: 2024, Volume and Issue: 536, P. 02007 - 02007

Published: Jan. 1, 2024

During the process of inundation in Water-level fluctuation zone(WLFZ), N and P content overlying water will vary due to release soil nutrients, directly impacting decomposition plants. However, current research on effects such changes plant is insufficient, hindering an accurate assessment its impact environments. This study simulated quality during designed 8 types with different initial nutrient levels. Taking typical WLFZ plant, Cynodon dactylon, as subject, dynamic these bodies were studied. The results showed that significantly increased water, forms affected inundation. Moreover, PN PP from stimulated activity aquatic microorganisms, enhancing self-purification capacity body, leading a decrease body after 60 days reveals released concentrations water. providing critical insights into ecosystem management.

Language: Английский

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Microbial colonization and decomposition of commercial tea and native alder leaf litter in temperate streams

Aquatic Sciences, Journal Year: 2021, Volume and Issue: 84(1)

Published: Nov. 23, 2021

Language: Английский

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A floresta ripária

Revista de Ciência Elementar, Journal Year: 2022, Volume and Issue: 10(2)

Published: June 30, 2022

Os ribeiros de floresta e a que os ladeia (floresta ripária) estão intimamente ligados, influenciando-se mutuamente. A ripária determina em grande medida as características abióticas (por exemplo, morfologia, qualidade da água) bióticas (comunidades processos aquáticos) dos ribeiros. Assim, alterações na podem ter grandes impactos nos nativa no centro norte Portugal é tipicamente caducifólia sua substituição por monoculturas ou invasão espécies exóticas altera detritos vegetais produzidos e, consequentemente, comunidades aquáticos.

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