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leaf litter decomposition

Jin Tao Li, Xue Kai Sun, Ya Lin Hu, Shan Yu Zhao, De Hui Zeng
Soil drying-rewetting is a common phenomenon in arid and semi-arid regions. Under the background of global climate change, it is predicted that the intensity of soil drying-rewetting cycle in Horqin Sandy Land will be further strengthened in the future. In this study, we conducted an in-situ soil column incubation experiment for 180 days to investigate the effects of soil drying-rewetting on leaf litter decomposition and nutrient releases of Populus simonii and Pinus sylvestris var. mongo-lica in Horqin Sandy Land...
June 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Guido Incerti, Fabrizio Cartenì, Gaspare Cesarano, Tushar C Sarker, Ahmed M Abd El-Gawad, Rosaria D'Ascoli, Giuliano Bonanomi, Francesco Giannino
Plant invasions can have relevant impacts on biogeochemical cycles, whose extent, in Mediterranean ecosystems, have not yet been systematically assessed comparing litter carbon (C) and nitrogen (N) dynamics between invasive plants and native communities. We carried out a 1-year litterbag experiment in 4 different plant communities (grassland, sand dune, riparian and mixed forests) on 8 invasives and 24 autochthonous plant species, used as control. Plant litter was characterized for mass loss, N release, proximate lignin and litter chemistry by 13 C CPMAS NMR...
2018: Frontiers in Plant Science
Lu Wang, Hai Jun Yang, Ling Li, Xiao Fei Nan, Zhen Xing Zhang, Kun Li
Annually, about 70% of the streams in the Changbai Mountains are frosted during November to April, with manifest seasonal freeze-thaw characters. By using monoculture and mixing leaf litters of Tilia amurensis, Acer mono and Quecus mongolica, this research attempted to disentangle the relationship between leaf litter decomposition and colonization of macroinvertebrates in the stream during early frost period. A 35-day investigation was carried out in a headwater stream of the Changbai Mountains. Nylon bags with two hole sizes (5 mm and 0...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
L A Leite-Rossi, H H L Saulino, E M Shimabukuro, M B Cunha-Santino, S Trivinho-Strixino
The diet of shredder chironomid larvae depends on the local and temporal conditions of the food resources. We analysed the gut content of shredder chironomid larvae that colonised the leaf litter of three riparian species: Hedychium coronarium, Pteridium arachnoideum and Magnolia ovata. We hypothesised that the differences in the decomposition rates of leaf litter species influence the consumption of plant tissue by shredder chironomid taxa over time. We incubated perforated bottles with each leaf species within four low-order streams during 1st, 3rd, 7th, 22nd, 36th, 55th and 85th day of exposure...
April 12, 2018: Neotropical Entomology
Chelse M Prather, Gary E Belovsky, Sharon A Cantrell, Grizelle González
Consumers can alter decomposition rates through both feces and selective feeding in many ecosystems, but these combined effects have seldom been examined in tropical ecosystems. Members of the detrital food web (litter-feeders or microbivores) should presumably have greater effects on decomposition than herbivores, members of the green food web. Using litterbag experiments within a field enclosure experiment, we determined the relative effects of common litter snails (Megalomastoma croceum) and herbivorous walking sticks (Lamponius portoricensis) on litter composition, decomposition rates, and microbes in a Puerto Rican rainforest, and whether consumer effects were altered by canopy cover presence...
March 30, 2018: Ecology
Zacchaeus G Compson, Bruce A Hungate, Thomas G Whitham, George W Koch, Paul Dijkstra, Adam C Siders, Todd Wojtowicz, Ryan Jacobs, David N Rakestraw, Kiel E Allred, Chelsea K Sayer, Jane C Marks
Leaf litter provides an important nutrient subsidy to headwater streams, but little is known about how tree genetics influences energy pathways from litter to higher trophic levels. Despite the charge to quantify carbon (C) and nitrogen (N) pathways from decomposing litter, the relationship between litter decomposition and aquatic consumers remains unresolved. We measured litter preference (attachments to litter), C and N assimilation rates, and growth rates of a shredding caddisfly (Hesperophylax magnus, Limnephilidae) in response to leaf litter of different chemical and physical phenotypes using Populus cross types (P...
March 30, 2018: Ecology
Alessia Bani, Luigimaria Borruso, Flavio Fornasier, Silvia Pioli, Camilla Wellstein, Lorenzo Brusetti
Litter decomposition is the main source of mineral nitrogen (N) in terrestrial ecosystem and a key step in carbon (C) cycle. Microbial community is the main decomposer, and its specialization on specific litter is considered at the basis of higher decomposition rate in its natural environment than in other forests. However, there are contrasting evidences on how the microbial community responds to a new litter input and if the mass loss is higher in natural environment. We selected leaf litter from three different plant species across three sites of different altitudinal ranges: oak (Quercus petraea (Matt...
March 26, 2018: Microbial Ecology
Héctor Rodríguez Pérez, Guillaume Borrel, Céline Leroy, Jean-François Carrias, Bruno Corbara, Diane S Srivastava, Régis Céréghino
Future climate scenarios forecast a 10-50% decline in rainfall in Eastern Amazonia. Altered precipitation patterns may change important ecosystem functions like decomposition through either changes in physical and chemical processes or shifts in the activity and/or composition of species. We experimentally manipulated hydroperiods (length of wet:dry cycles) in a tank bromeliad ecosystem to examine impacts on leaf litter decomposition. Gross loss of litter mass over 112 days was greatest in continuously submersed litter, lowest in continuously dry litter, and intermediate over a range of hydroperiods ranging from eight cycles of 7 wet:7 dry days to one cycle of 56 wet:56 dry days...
March 24, 2018: Oecologia
Andreia Cm Rodrigues, Ana L Machado, Maria D Bordalo, Liliana Saro, Fátima C P Simão, Rui Mj Rocha, Oksana Golovko, Vladimir Zlabek, Carlos Barata, Amadeu M V M Soares, João L T Pestana
Anthropogenic activities increase pesticide contamination and biological invasions in freshwater ecosystems. Understanding their combined effects on community structure and on ecosystem functioning presents challenges for an improved ecological risk assessment. This study focuses on an artificial stream mesocosms experiment testing for direct and indirect effects of insecticide (chlorantraniliprole - CAP) exposure on the structure of a benthic macroinvertebrate freshwater community and on ecosystem functioning (leaf decomposition, primary production)...
March 22, 2018: Environmental Science & Technology
Mathieu Santonja, Laura Pellan, Christophe Piscart
Plant litter decomposition is an essential ecosystem function that contributes to carbon and nutrient cycling in streams. Aquatic shredders, mainly macroinvertebrates, can affect this process in various ways; they consume leaf litter, breaking it down into fragments and creating suitable habitats or resources for other organisms through the production of fine particulate organic matter (FPOM). However, measures of litter-feeding traits across a wide range of aquatic macroinvertebrates are still rare. Here, we assessed the contributions of 11 species of freshwater macroinvertebrates to litter decomposition, by measuring consumption rate, FPOM production, and assimilation rate of highly decomposable ( Alnus glutinosa ) or poorly decomposable ( Quercus robur ) leaf litter types...
March 2018: Ecology and Evolution
Wei Fu, Xingyuan He, Sheng Xu, Wei Chen, Yan Li, Bo Li, Lili Su, Qin Ping
Ground-level ozone (O3 ) pollution has been widely concerned in the world, particularly in the cities of Asia, including China. Elevated O3 concentrations have potentially influenced growth and nutrient cycling of trees in urban forest. The decomposition characteristics of urban tree litters under O3 exposure are still poorly known. Ginkgo biloba is commonly planted in the cities of northern China and is one of the main tree species in the urban forest of Shenyang, where concentrations of ground-level O3 are very high in summer...
2018: PeerJ
Sara L Jackrel, Timothy C Morton
Differences among individuals within species affect community and ecosystem processes in many systems, and may rival the importance of differences between species. Intraspecific variation consists of both plastic and genetic components that are regulated by different processes and operate on different time scales. Therefore, probing which mechanisms can affect traits sufficiently strongly to affect ecosystem processes is fundamental to understanding the consequences of individual variation. We find that a dominant deciduous tree of Pacific Northwest riparian ecosystems, red alder, exhibits strong and synergistic responses to nutrient resources and herbivory stress...
April 2018: Oecologia
Witoon Purahong, Tesfaye Wubet, Tiemo Kahl, Tobias Arnstadt, Björn Hoppe, Guillaume Lentendu, Kristin Baber, Tyler Rose, Harald Kellner, Martin Hofrichter, Jürgen Bauhus, Dirk Krüger, François Buscot
Nitrogen deposition can strongly affect biodiversity, but its specific effects on terrestrial microbial communities and their roles for ecosystem functions and processes are still unclear. Here, we investigated the impacts of N deposition on wood-inhabiting fungi (WIF) and their related ecological functions and processes in a highly N-limited deadwood habitat. Based on high-throughput sequencing, enzymatic activity assay and measurements of wood decomposition rates, we show that N addition has no significant effect on the overall WIF community composition or on related ecosystem functions and processes in this habitat...
May 2018: Environmental Microbiology
José Rincón, Diana Merchán, Agustin Sparer, Damodara Rojas, Edwin Zarate
The ecological condition of tropical Andean rivers are threatened by many human activities including changes in land use and cover in watersheds. Current protocols diagnose the structural condition of streams but not their function. In this study we proposed an assessment tool using the leaf-litter breakdown as a measure of the functional condition and health of high Andean streams in Southern Ecuador, including methodology and threshold values adapted to local conditions. We selected 15 streams in three micro-basins (Mazán, Llaviuco and Matadero) within or in the vicinity of Cajas National Park where we deployed litterbags for 15, 28 and 64 days...
March 2017: Revista de Biología Tropical
Jingjing Du, Yuyan Zhang, Wei Guo, Ningyun Li, Chaoshuai Gao, Minghui Cui, Zhongdian Lin, Mingbao Wei, Hongzhong Zhang
Titanium dioxide (TiO2 ) nanoparticles have been applied in diverse commercial products, which could lead to toxic effects on aquatic microbes and would inhibit some important ecosystem processes. The study aimed to investigate the chronic impacts of TiO2 nanoparticles with different concentrations (5, 50, and 500 mg L-1 ) on Populus nigra L. leaf decomposition in the freshwater ecosystem. After 50 d of decomposing, a significant decrease in decomposition rates was observed with higher concentrations of TiO2 nanoparticles...
May 15, 2018: Journal of Hazardous Materials
Javier Pérez, Aingeru Martínez, Enrique Descals, Jesús Pozo
Aquatic hyphomycetes represent a large component of the microbial assemblage that decomposes submerged leaf-litter in fluvial ecosystems. The structure and activity of these fungal decomposers depend on environmental factors. Fungal communities may adapt to local habitat conditions; however, little is known about how fungal communities respond to abrupt changes in factors such as nutrient availability and temperature. To respond to this question, we carried out a cross-transplantation experiment, which assessed the decomposer activity and structure of this microbial community on decaying leaves transplanted from a cold and oligotrophic stream (S1) to a warmer and nitrogen-richer one (S2) and vice versa...
February 7, 2018: Microbial Ecology
Juha Mikola, Tarja Silfver, Ulla Paaso, Boy J M H Possen, Matti Rousi
Plants enhance N use efficiency by resorbing N from senescing leaves. This can affect litter N mineralization rate due to the C:N-ratio requirements of microbial growth. We examined genotypic links between leaf N resorption and litter mineralization by collecting leaves and litter from 19 Betula pendula genotypes and following the N release of litter patches on forest ground. We found significant genotypic variation for N resorption efficiency, litter N concentration, cumulative three-year patch N-input and litter N release with high broad-sense heritabilities (H2  = 0...
February 7, 2018: Ecology
Yanyu Song, Changchun Song, Jiusheng Ren, Wenwen Tan, Shaofei Jin, Lei Jiang
Nitrogen (N) availability affects litter decomposition and nutrient dynamics, especially in N-limited ecosystems. We investigated the response of litter decomposition to N additions in Eriophorum vaginatum and Vaccinium uliginosum peatlands. These two species dominate peatlands in Northeast China. In 2012, mesh bags containing senesced leaf litter of Eriophorum vaginatum and Vaccinium uliginosum were placed in N addition plots and sprayed monthly for two years with NH4 NO3 solution at dose rates of 0, 6, 12, and 24gNm-2 year-1 (CK, N1, N2 and N3, respectively)...
June 1, 2018: Science of the Total Environment
Daan Blok, Samuel Faucherre, Imre Banyasz, Riikka Rinnan, Anders Michelsen, Bo Elberling
Tundra regions are projected to warm rapidly during the coming decades. The tundra biome holds the largest terrestrial carbon pool, largely contained in frozen permafrost soils. With warming, these permafrost soils may thaw and become available for microbial decomposition, potentially providing a positive feedback to global warming. Warming may directly stimulate microbial metabolism but may also indirectly stimulate organic matter turnover through increased plant productivity by soil priming from root exudates and accelerated litter turnover rates...
December 13, 2017: Global Change Biology
Juanita Mora-Gómez, Sofia Duarte, Fernanda Cássio, Cláudia Pascoal, Anna M Romaní
Drought frequency and intensity in some temperate regions are forecasted to increase under the ongoing global change, which might expose permanent streams to intermittence and have severe repercussions on stream communities and ecosystem processes. In this study, we investigated the effect of drought duration on microbial decomposition of Populus nigra leaf litter in a temperate permanent stream (Oliveira, NW Portugal). Specifically, we measured the response of the structural (assemblage composition, bacterial and fungal biomass) and functional (leaf litter decomposition, extracellular enzyme activities (EEA), and fungal sporulation) parameters of fungal and bacterial communities on leaf litter exposed to emersion during different time periods (7, 14 and 21d)...
April 15, 2018: Science of the Total Environment
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