Carbon and nitrogen stocks under different management systems in the Paraiban Serto

Barros, Jocilene Dantas; Chaves, Lúcia Helena Garófalo; Pereira, Walter Esfrain

doi:10.5897/ajar2014.8706

Cited by 14 publications

(1 citation statement)

References 15 publications

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“…Unfortunately, the Caatinga dry forest has been driven toward desertification over large areas as soils become deeply depauperated due to superficial erosion (i.e., runoff) and nutrient exportation via crops/livestock (Leal et al, 2005;Vieira et al, 2015). Local depletion of forest regeneration sources, such as seeds, seedlings and resprouts can Caatinga soil 20.00 10 cm Tiessen et al, 1998 Caatinga soil 26.20 10 cm Kauffman et al, 1993 Caatinga soil 4.14 5 cm Schulz et al, 2016 Caatinga soil 17.00 5-60 cm Schulz et al, 2016 Caatinga soil 35.13-46.46 40 cm Barros et al, 2015 Caatinga slash and burn recovering soil 23.15 20 cm Althoff et al, 2018 Caatinga preserved soil 31.85 20 cm Althoff et al, 2018 Deserts and Semi Deserts soil 57.00 Across all horizons Prentice et al, 2001 Tropical Savannas and Grasslands soil 90.00 Across all horizons Prentice et al, 2001 Tropical Forest soil 122.00 Across all horizons Prentice et al, 2001 Temperate Forest soil 147.00 Across all horizons Prentice et al, 2001 Boreal Forest soil 274.00 Across all horizons Prentice et al, 2001 also be important (Tabarelli et al, 2017). Increased aridity (as predicted by climate change models; Torres et al, 2017) can magnify this human-induced degradation.…”

Section: Biocrusts As Ecosystem Service Providers and Their Role For mentioning

confidence: 99%

Neglected but Potent Dry Forest Players: Ecological Role and Ecosystem Service Provision of Biological Soil Crusts in the Human-Modified Caatinga

et al. 2019

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Biological soil crusts (biocrusts) have been recognized as key ecological players in arid and semiarid regions at both local and global scales. They are important biodiversity components, provide critical ecosystem services, and strongly influence soil-plant relationships, and successional trajectories via facilitative, competitive, and edaphic engineering effects. Despite these important ecological roles, very little is known about biocrusts in seasonally dry tropical forests. Here we present a first baseline study on biocrust cover and ecosystem service provision in a human-modified landscape of the Brazilian Caatinga, South America's largest tropical dry forest. More specifically, we explored (1) across a network of 34 0.1 ha permanent plots the impact of disturbance, soil, precipitation, and vegetation-related parameters on biocrust cover in different stages of forest regeneration, and (2) the effect of disturbance on species composition, growth and soil organic carbon sequestration comparing early and late successional communities in two case study sites at opposite ends of the disturbance gradient. Our findings revealed that biocrusts are a conspicuous component of the Caatinga ecosystem with at least 50 different taxa of cyanobacteria, algae, lichens and bryophytes (cyanobacteria and bryophytes dominating) covering nearly 10% of the total land surface and doubling soil organic carbon content relative to bare topsoil. High litter cover, high disturbance by goats, and low soil compaction were the leading drivers for reduced biocrust cover, while precipitation was not associated Second-growth forests supported anequally spaced biocrust cover, while in old-growth-forests biocrust cover was patchy. Disturbance reduced biocrust growth by two thirds and carbon sequestration by half. In synthesis, biocrusts increase soil organic carbon (SOC) in dry forests and as they double the SOC content in disturbed areas, may be capable of counterbalancing disturbance-induced soil degradation in this ecosystem. As they fix and fertilize depauperated soils, they may play a substantial role in vegetation regeneration in the human-modified Caatinga, and may have an extended ecological role due to the Szyja et al. Caatinga Biocrust Distribution and Services ever-increasing human encroachment on natural landscapes. Even though biocrusts benefit from human presence in dry forests, high levels of anthropogenic disturbance could threaten biocrust-provided ecosystem services, and call for further, in-depth studies to elucidate the underlying mechanisms.

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Section: Biocrusts As Ecosystem Service Providers and Their Role For mentioning

confidence: 99%

Neglected but Potent Dry Forest Players: Ecological Role and Ecosystem Service Provision of Biological Soil Crusts in the Human-Modified Caatinga

et al. 2019

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Grazing deteriorates the soil carbon stocks of Caatinga forest ecosystems in Brazil

Schulz

Voigt

Beusch

et al. 2016

Forest Ecology and Management

113

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Recovery of carbon stocks in deforested caatinga dry forest soils requires at least 60 years

Filho

Freire

Wilcox

et al. 2018

Forest Ecology and Management

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Carbon and nitrogen stocks under different management systems in the Paraiban Serto

Cited by 14 publications

References 15 publications

Neglected but Potent Dry Forest Players: Ecological Role and Ecosystem Service Provision of Biological Soil Crusts in the Human-Modified Caatinga

Neglected but Potent Dry Forest Players: Ecological Role and Ecosystem Service Provision of Biological Soil Crusts in the Human-Modified Caatinga

Grazing deteriorates the soil carbon stocks of Caatinga forest ecosystems in Brazil

Recovery of carbon stocks in deforested caatinga dry forest soils requires at least 60 years

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