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Ga Z, Jiang S, Han J, Wang G, Zhang X. Biodegradation of mixed litter-derived dissolved organic matter with varying evenness in a temperate freshwater wetland. Oecologia 2024:10.1007/s00442-024-05590-3. [PMID: 38976074 DOI: 10.1007/s00442-024-05590-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Accepted: 07/01/2024] [Indexed: 07/09/2024]
Abstract
Litter-derived dissolved organic matter (DOM) plays an essential role in biogeochemical cycles. In wetlands, species relative abundance and its change have great influences on input features of litter-derived DOM, including chemical characteristics per se and functional diversity of chemical characteristics. Functional diversity is an important factor controlling organic matter biodegradation, but little is known in terms of the DOM. We mixed litter leachates of four macrophytes with a constant concentration (20 mg DOC L-1) but varying dominant species and volume ratios, i.e. 15:1:1:1 (low-evenness), 5:1:1:1 (mid-evenness), and 2:1:1:1 (high-evenness), generating a gradient of chemical characteristics and functional diversity (represented by functional dispersion index FDis). Based on a 42-d incubation, we measured degradation dynamics of these DOM mixtures, and analyzed potential determinants. After 42 days of incubation, the high-evenness treatments, along with mid-evenness treatments sometimes, had most degradation, while the low-evenness treatments always had least degradation. The degradation of mixtures related significantly to not only the volume-weighted mean chemical characteristics but also FDis. Furthermore, the FDis even explained more variation of degradation. The non-additive mixing effects, synergistic effects (faster degradation than predicted) in particular, on degradation of DOM mixtures were rather common, especially in the high- and mid-evenness treatments. Remarkably, the mixing effects increased linearly with the FDis values (r2adj. = 0.426). This study highlights the critical role of functional diversity in regulating degradation of mixed litter-derived DOM. Resulting changes in chemistry and composition of litter leachates due to plant community succession may exert substantial influences on biogeochemical cycling.
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Affiliation(s)
- Zhuoma Ga
- Jiangsu Key Laboratory of Environmental Change and Ecological Construction, School of Environment, Nanjing Normal University, No.1 Wenyuan Rd, Nanjing, 210023, China
| | - Shuangshuang Jiang
- Jiangsu Key Laboratory of Environmental Change and Ecological Construction, School of Environment, Nanjing Normal University, No.1 Wenyuan Rd, Nanjing, 210023, China
| | - Jiangang Han
- College of Biology and Environment, Nanjing Forestry University, Nanjing, China
| | - Guoxiang Wang
- Jiangsu Key Laboratory of Environmental Change and Ecological Construction, School of Environment, Nanjing Normal University, No.1 Wenyuan Rd, Nanjing, 210023, China
| | - Xinhou Zhang
- Jiangsu Key Laboratory of Environmental Change and Ecological Construction, School of Environment, Nanjing Normal University, No.1 Wenyuan Rd, Nanjing, 210023, China.
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Molleman F, Rossignol N, Ponge JF, Peres G, Cluzeau D, Ruiz-Camacho N, Cortet J, Pernin C, Villenave C, Prinzing A. Why phylogenetic signal of traits is important in ecosystems: uniformity of a plant trait increases soil fauna, but only in a phylogenetically uniform vegetation. Oecologia 2023; 202:175-191. [PMID: 37204497 DOI: 10.1007/s00442-023-05384-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 05/08/2023] [Indexed: 05/20/2023]
Abstract
Phylogenetically closely related plant species often share similar trait states (phylogenetic signal), but local assembly may favor dissimilar relatives and thereby decouple the diversity of a trait from the diversity of phylogenetic lineages. Associated fauna might either benefit from plant trait diversity, because it provides them complementary resources, or suffer from it due to dilution of preferred resources. We hence hypothesize that decoupling of trait and phylogenetic diversity weakens the relationship between the plant-trait diversity and the abundance and diversity of associated fauna. Studying permanent meadows, we tested for combined effects of plant phylogenetic diversity and diversity of two functional traits (specific leaf area, leaf dry matter content) on major groups of soil fauna (earthworms, mites, springtails, nematodes). We found that only in phylogenetically uniform plant communities, was uniformity in the functional traits associated with (i) high abundance in springtails, and (ii) high abundance of the sub-group that feeds more directly on plant material (in springtails and mites) or those that are more prone to disturbance (in nematodes), and (iii) high diversity in all three groups tested (springtails, earthworms, nematodes). Our results suggest that soil fauna profits from the resource concentration in local plant communities that are uniform in both functional traits and phylogenetic lineages. Soil fauna would hence benefit from co-occurrence of closely related plants that have conserved the same trait values, rather than of distantly related plants that have converged in traits. This might result in faster decomposition and a positive feedback between trait conservatism and ecosystem functioning.
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Affiliation(s)
- F Molleman
- Department of Systematic Zoology, Faculty of Biology, Institute of Environmental Biology, Adam Mickiewicz University Poznań, Ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland.
| | - N Rossignol
- Université de Rennes 1/Centre National de la Recherche Scientifique, Research Unit 'Ecobio-Ecosystèmes, Biodiversité, Evolution', Campus Beaulieu, Bâtiment 14 A, 35042, Rennes, France
| | - J F Ponge
- Muséum National d'Histoire Naturelle, CNRS UMR 7179, 4 avenue du Petit Château, 91800, Brunoy, France
| | - G Peres
- UMR SAS INRAE Institut Agro Rennes-Angers, 65 Rue de St-Brieuc, 35042, Rennes, France
| | - D Cluzeau
- Université de Rennes 1/Centre National de la Recherche Scientifique, Research Unit 'Ecobio-Ecosystemes, Biodiversite, Evolution', Station Biologique, 35380, Paimpont, France
| | - N Ruiz-Camacho
- Agence Nationale de la Recherche, 50, avenue Daumesnil, 75012, Paris, France
| | - J Cortet
- Centre d'Ecologie Fonctionnelle et Evolutive, Université Paul-Valéry Montpellier 3, Université de Montpellier, EPHE, IRD, Route de Mende, 34199, Montpellier, France
| | - C Pernin
- Université de Lille, Institut Mines-Télécom, Université Artois, Junia, ULR 4515-LGCgE, Laboratoire de Génie Civil et geo-Environnement, 59000, Lille, France
| | - C Villenave
- ELISOL environnement, ZA des Tourels, 10 avenue du midi, 30111, Congénies, France
| | - A Prinzing
- Université de Rennes 1/Centre National de la Recherche Scientifique, Research Unit 'Ecobio-Ecosystèmes, Biodiversité, Evolution', Campus Beaulieu, Bâtiment 14 A, 35042, Rennes, France
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Bopp MC, Fried G, Metay A, Bastianelli D, Bonnal L, Kazakou E. Linkages between traits and decomposition of weed communities along a soil management and pedoclimate gradient in Mediterranean vineyards. ANNALS OF BOTANY 2022; 130:547-560. [PMID: 35947944 PMCID: PMC9510946 DOI: 10.1093/aob/mcac099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND AIMS Decomposition is a major ecosystem process which improves soil quality. Despite that, only a few studies have analysed decomposition in an agricultural context, while most agrosystems (e.g. vineyards) are facing decreasing soil quality. The objective of this study is to understand the impacts of both pedoclimate and weed management on the mass loss of vineyard weed communities during the early stages of the decomposition process through their functional properties. METHODS In 16 Mediterranean vineyards representing both a pedoclimate and a soil management gradient, we measured the mass loss of green above-ground biomass of 50 weed communities during decomposition in standard conditions and key leaf traits of dominant species [e.g. leaf dry matter content (LDMC) and leaf lignin to nitrogen ratio (lignin:N)]. Both the mean [i.e. community-weighted mean (CWM)] and diversity (i.e. Rao index) were computed at the community level. Path analysis was used to quantify the effects of agro-environmental filters on the mass loss of weed communities through their functional properties. KEY RESULTS Tillage and mowing filtered more decomposable communities than chemical weeding (16 and 8 % of higher mass loss after 2 months of decomposition). Path analysis selected weed management practice type as the main factor determining mass loss through its effect on functional properties, while soil and climate had minor and no effects, respectively. Chemical weeding favoured communities with higher investment in resistant leaves (e.g. 38 % higher lignin:N, 22 % lower leaf nitrogen content) which resulted in lower mass loss compared with tilled and mowed communities. Mowing favoured communities with 47 % higher biomass and with 46 % higher nitrogen content. CONCLUSIONS Weed management significantly influenced weed mass loss, while the pedoclimate had little effect. Our results suggest that mowing is a promising alternative to herbicide use, favouring higher biomass, nitrogen content and decomposability potential of weeds.
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Affiliation(s)
| | - Guillaume Fried
- Anses, Laboratoire de la Santé des Végétaux, Unité Entomologie et Plantes invasives, 34988 Montferrier-sur-Lez, France
| | - Aurélie Metay
- UMR ABSys, Institut Agro, Inrae, Cirad, CIHEAM-IAMM, Univ Montpellier, 2 Place Pierre Viala, 34060 Montpellier, France
| | - Denis Bastianelli
- CIRAD, UMR SELMET, F-34398 Montpellier, France
- SELMET, Univ Montpellier, CIRAD, INRAE, Institut Agro, Montpellier, France
| | - Laurent Bonnal
- CIRAD, UMR SELMET, F-34398 Montpellier, France
- SELMET, Univ Montpellier, CIRAD, INRAE, Institut Agro, Montpellier, France
| | - Elena Kazakou
- CEFE, Univ Montpellier, CNRS, EPHE, IRD, Institut Agro, Montpellier, France
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