Litter and nutrient flows in tropical upland forest flooded by a hydropower plant in the Amazonian basin

Pereira, Guilherme Henrique Almeida; Jordão, Henos Carlos K.; Silva, Vanessa Francieli V.; Pereira, Marcos Gervásio

doi:10.1016/j.scitotenv.2016.07.177

Cited by 8 publications

(7 citation statements)

References 42 publications

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“…This speculation was supported by our results that the significant greater RC content and RIC were observed in the low elevation zone compared to the high elevation zones ( Fig. 2e,f), revealing larger recalcitrant fractions with slower decomposition rates 43 . Whereas, the LC showed different changing trend from the SOC and RC, with the lowest level in the low elevation zone 43 (Fig.…”

Section: Discussionsupporting

confidence: 71%

“…2e,f), revealing larger recalcitrant fractions with slower decomposition rates 43 . Whereas, the LC showed different changing trend from the SOC and RC, with the lowest level in the low elevation zone 43 (Fig. 2d), likely due to its faster decomposition rates under flooding zone with lower temperature (Table 2).…”

Section: Discussionmentioning

confidence: 97%

“…greater biomass vs. lower SOC content) ( Table 1 and Fig. 1c), this phenomenon could attribute to the low sensitivity of SOC to plant changes during anti-seasonal flooding [43][44][45] . Meanwhile, the SOC content in the low elevation zone without any plant input did not significantly differ with the vegetation coverage zone (high elevation and control zones) ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…3e-h and 4b). This variation was possibly because of multiple drives such as changes in soil C content and fraction as well as soil microclimates induced by water flooding 1,43,46 . Indeed, the C-hydrolyzing enzyme activities were positively bound up with the SOC, LC contents, and soil temperature; while parts of enzyme activities were negatively associated with the RIC and soil moisture across sites and elevations (Table 5 and Fig.…”

Section: Discussionmentioning

confidence: 99%

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Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Zhang

Yang

et al. 2020

Sci Rep

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The effect of flooding on soil enzyme activities and soil organic carbon (SOC) dynamics remains a widely debated topic. Here, we investigated spatial variations in C-hydrolyzing enzyme activities, soil C contents in different fractions [i.e. labile and recalcitrant carbon (LC and RC)] from 6 sites with four different elevations at two soil depths (0-10 cm and 10-30 cm) in riparian zones of the Three Gorges Reservoir, China. At region scales, the SOC, RC contents, and RC/SOC (RIC) generally showed decreasing tendency from the upstream to the downstream. The C-hydrolyzing enzyme activities were higher in the midstream compared to other sites, which did not correspond well with the changing trend of SOC content, but matched with the spatial variation in LC content. At ecosystem scales, the RC and RIC declined with decreased elevations, but the LC showed opposite trend. Whereas, the four C-hydrolyzing enzyme activities and the specific enzyme activities were corresponded well with the changing trend of Lc content. Soil c contents and enzyme activities were generally higher in top soil than deep soil across sites and elevation zones. These results reveal that the LC is the tightest factor in regulating C-hydrolyzing enzyme activities, whereas the soil C quality (i.e. RIC) and flooding collectively drive C-hydrolyzing enzyme activities possibly by affecting decomposition rates of SOC in the riparian zones. Anthropogenic activities such as large hydroelectric project can directly affect ecosystem processes and function by altering vegetation types, soil properties and hydrology 1,2 , and ultimately modify soil carbon (C) and nitrogen (N) cycling 3-5. Soil organic carbon (SOC), one of the largest and most susceptible C pools of the earth surface ecosystem, can act either as source or sink for C primarily counting on multiple factors including human activities 6-10. It is well known that the SOC pool is generally determined by the balance between litter C input and decomposition 7,11 , while the SOC decomposition process is predominantly catalyzed by a variety of extracellular enzymes 12-14. Particularly, these enzymes can hydrolyze substrates and catalyze important transformations involving in soil organic matter (SOM) synthesis 15,16. Although some studies have evaluated changes in soil C and N dynamics under large hydroelectric project 3,4,17 , how spatial variations in SOC dynamics link to C-hydrolyzing enzyme activities at region and/or ecosystem scales under large hydroelectric project remains largely unclear. The linkages between SOC and C-hydrolyzing enzyme activities can be influenced primarily by altering vegetation types under large hydroelectric projects 2,3,18,19. Most SOC exclusively originates from plant residues on site, and hence alterations in vegetation type are expected to change the quality and quantity of SOC, which in turn can affect C-hydrolyzing enzyme activities 20-23. For instance, previous studies have reported that soil hydrolytic enzyme activities are tightly related to SOC content 12,23,24 ,...

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Zhang

Yang

et al. 2020

Sci Rep

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“…Nesse estudo, a produção total de serapilheira registrou a maior quantidade de nutriente para N e isto se deve a eficiente fixação deste elemento pelas plantas, demonstrando conformidade com os resultados vistos em outros trabalhos (GODINHO et al, 2013;CALDEIRA et al, 2013;). A segunda maior taxa nutricional foi de Ca, com picos mais elevados na estação seca, devido, supostamente, à menor taxa metabólica neste período fazendo com que reduza sua mobilidade (DIAS et al, 2002) e a sua liberação na serapilheira está diretamente ligada à decomposição biológica e posterior absorção direta das raízes finas (PEREIRA et al, 2016). Na sequência, tem-se K que também foi mais expressivo no período seco, pelo fato deste elemento se encontrar nos vegetais apenas na sua forma iônica (GODINHO et al, 2013).…”

Section: Discussionunclassified

Dinâmica De Serapilheira Em Uma Área De Floresta De Terra Firme, Amazônia Ocidental

Freire

Ventura

Fotopoulos

et al. 2020

NAT

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O objetivo deste estudo foi avaliar a produção e decomposição de serapilheira em uma área de floresta primária de terra firme na Reserva Biológica do Jaru. Para tanto, foi implantada uma parcela permanente de 1 hectare, onde foram demarcadas 25 subparcelas com 20 x 20 m cada. Para a coleta de serapilheira, instalou-se 25 coletores de PVC (1 em cada centro da subparcela), medindo 0,25 m², a 1 metro do solo, com malha de nylon de 1 mm. Para estimar o estoque de serapilheira, utilizou-se 25 coletores de madeira, medindo 0,25 m², com malha de nylon de 1 mm, dispostos no solo de cada subparcela. As coletas da pesquisa foram realizadas quinzenalmente, entre os meses de outubro de 2016 a setembro de 2017, e a serapilheira triada nas frações: folha, galho, material reprodutivo e miscelânea. No laboratório, os materiais amostrados foram secos em estufa à 80 ºC e pesados em balança de precisão centesimal, sendo que a decomposição de serapilheira foi estimada através da relação entre produção e estoque. De acordo com os resultados obtidos, a produção de serapilheira total foi de 14,13 Mg ha-1 e as frações seguiram o padrão: folhamiscelâneagalhomaterial reprodutivo. As maiores produções aconteceram na estação seca e a taxa de decomposição foi 1,37, indicando que a atividade microbiana na área de estudo é acelerada.Palavras-chave: dinâmica sazonal; nutrição de plantas; ecologia florestal; decomposição. LITTER DYNAMICS IN A FOREST AREA OF GROUND FIRM, WESTERN AMAZON ABSTRACT:The objective of this study was to evaluate the litter production and decomposition in an area of primary upland forest in the Jaru Biological Reserve. For that, a permanent plot of 1 hectare was implanted, where 25 subplots with 20 x 20 m each were demarcated. For the collection of litter, 25 PVC collectors were installed (1 in each center of the subplot), measuring 0.25 m², 1 meter from the ground, with 1 mm nylon mesh. To estimate the litter stock, 25 wood collectors, measuring 0.25 m², with 1 mm nylon mesh, were used, arranged in the soil of each subplot. The collections of the research were carried out fortnightly, between the months of October 2016 and September 2017, and the litter is sorted in the fractions: leaf, branch, reproductive material and miscellaneous. In the laboratory, the sampled materials were dried in an oven at 80 ºC and weighed on a centesimal precision scale, and the litter decomposition was estimated through the relationship between production and stock. According to the results obtained, the total litter production was 14.13 Mg ha-1 and the fractions followed the pattern: leafmiscellaneousbranchreproductive material. The highest yields occurred in the dry season and the decomposition rate was 1.37, indicating that the microbial activity in the study area is accelerated.Keyword: seasonal dynamics; plant nutrition; forest ecology; decomposition.

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Artificial flooding changes soil chemistry and carbon dynamics in upland forests next to hydropower plant in Amazon basin

Pereira

Silva

Camara

et al. 2020

Environ Dev Sustain

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Litter and nutrient flows in tropical upland forest flooded by a hydropower plant in the Amazonian basin

Cited by 8 publications

References 42 publications

Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Dinâmica De Serapilheira Em Uma Área De Floresta De Terra Firme, Amazônia Ocidental

Artificial flooding changes soil chemistry and carbon dynamics in upland forests next to hydropower plant in Amazon basin

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