Soil organic carbon fractions and humic substances are affected by land uses of Caatinga forest in Brazil

Santos, Uemeson José dos; Duda, Gustavo Pereira; Marques, Marise Conceição; Medeiros, Érika Valente de; Lima, José Romualdo de Sousa; Souza, Eduardo Soares de; Brossard, Michel; Hammecker, Claude

doi:10.1080/15324982.2018.1555871

Cited by 19 publications

(15 citation statements)

References 54 publications

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“…These higher contents in the NF area are due to the higher litter deposition of different forest extracts (Ozório et al, 2019), which increases the TOC contents in the most superficial layers of the soil (Assunção et al, 2019). Several authors have reported higher TOC contents in higher native areas compared with production systems in different regions of Brazil, soil types, and management systems (Borges et al, 2019;Maia et al, 2019;Santos et al, 2019;Ferreira et al, 2020;Medeiros et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Stock and indices of carbon management under different soil use systems

Morais

Silva

Rosset

et al. 2021

Rev. Bras. Ciênc. Ambient. (Online)

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The aim of this study was to evaluate the stock of total organic carbon (TOC) and to perform the physical-granulometric fractionation of soil organic matter (SOM) in different management systems (MS). Three MS and one reference area of Native Forest (NF) were studied, and the three systems were sugarcane (SC), permanent pasture (PP) and no-tillage system (NTS). Soil samples were collected in the 0–0.05, 0.05–0.10, 0.10–0.20-m layers. Soil density (Sd), TOC, stratification index (SI), carbon stock (StockC), variation in StockC (∆StockC), carbon content of particulate organic matter (C-POM) and mineral organic matter (C-MOM), carbon stock index (CSI), lability (L), lability index (LI), and carbon management index (CMI) were determined. The MS presented higher Sd than the NF area. The NF area had higher TOC contents in the first layers, reaching 25.40 g kg-1 in the 0–0.05-m layer, with the PP area having higher values than the NF in the 0.10–0.20-m layer. The NF area showed the highest levels of C-POM (15.25 g kg-1) and C-MOM (10.15 g kg-1) in the first layer. In the 0.10–0.20-m layer, the PP and NTS systems were superior to the others. Regarding the C-MOM content, SC and PP showed higher levels in the 0.10–0.20-m layer. The highest CMI values were observed in the NTS and PP areas in the 0.10–0.20-m layer. The MS increased the Sd and reduced the TOC levels. The different MS modified the POM fraction, and the MOM fraction was most impacted by the SC area. The lability of the SOM was altered by the MS in the most superficial layers.

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Section: Resultsmentioning

confidence: 99%

Stock and indices of carbon management under different soil use systems

Morais

Silva

Rosset

et al. 2021

Rev. Bras. Ciênc. Ambient. (Online)

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“…This development has resulted in increased transfer of nutrients and pollutants to coastal marine environments (Petersen et al, 2017), adversely affecting corals that would normally thrive under oligotrophic conditions (Burkepile et al, 2020;Ferrier-Pagès et al, 2000;Hall et al, 2018). This development has, furthermore, resulted in qualitative and quantitative shifts in HS that are transferred to the adjacent marine environment (dos Santos et al, 2019;Spaccini et al, 2006). For example, soils of deforested agricultural fields showed a 38 to 53% reduction in HS relative to soils of natural forests (dos Santos et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…This development has, furthermore, resulted in qualitative and quantitative shifts in HS that are transferred to the adjacent marine environment (dos Santos et al, 2019;Spaccini et al, 2006). For example, soils of deforested agricultural fields showed a 38 to 53% reduction in HS relative to soils of natural forests (dos Santos et al, 2019). Although the impact of nutrient enrichment on tropical coral reefs has been studied extensively (Burkepile et al, 2020;Ferrier-Pagès et al, 2000;Hall et al, 2018), the specific effects related to the loss and modification of HS in these ecosystems are relatively unknown.…”

Section: Introductionmentioning

confidence: 99%

Humic substances mitigate adverse effects of elevated temperature with potentially critical repercussions for coral reef resilience

Stuij

Cleary

Voogd

et al. 2023

Preprint

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Previous observational studies have suggested that terrestrially-derived compounds, most notably humic substances (HS) can protect coral reefs from thermal stress. No study hitherto has, however, tested this hypothesis. In the present study, we used a randomised-controlled microcosm setup to test to what extent HS are able to mitigate the adverse effects of elevated temperature and intense UVB radiation on coral photosynthetic activity, and environmental and host-associated bacterial ercommunities. Our results clearly demonstrate a significant protective effect of HS. Corals in HS-supplemented microcosms had significantly higher photosynthetic activities than those in microcosms subjected to elevated heat and intense UVB radiation. Our results, furthermore, showed that coral reef organisms in HS-supplemented microcosms contained unique bacterial communities enriched with known groups of potentially beneficial bacteria. Our findings have significant repercussions for reef resilience in the face of increasing climate-induced stressors and highlight the importance of restoring coastal forests and the land-sea interface in order to protect coral reefs.

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“…O Brasil é um dos principais países que possui quantidade significativa de recursos florestais, além de ser o único com ampla área de floresta tropical como afirma o Sistema Nacional de Informações Florestais-SNIF (2019). E por falta de conhecimento sobre as espécies e a ausência de manejo adequado, acentua-se a degradação de algumas áreas como a Caatinga, com registro de 46% de degradação em sua vegetação natural (Santos et al, 2019). Freire et al (2020) afirmam que o Bioma Caatinga tem uma extensão territorial importante, sendo o único e exclusivamente brasileiro.…”

Section: Introductionunclassified

Influencia hídrica na germinação de sementes da espécie florestal Mimosa Caesalpiniifolia Benth

Herculano

Silva

Ribeiro

et al. 2021

RSD

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Nas regiões semiáridas brasileiras as chuvas são irregulares, seca de longa duração, solos rasos e rochosos, e possuem importante potencial florestal para o meio ambiente e socioeconômica. Devido a contínua exploração dos recursos naturais ocasionando impactos significativos e danos à flora e à fauna, como exemplo, a extinção de espécies únicas na área. Para reverter a degradação nessa região é importante que na produção de mudas a quantidade de água necessária seja disponibilizada desde a semeadura proporcionando umidade ideal para maior porcentagem de germinação. Nesse contexto, a presente pesquisa foi realizada objetivando-se avaliar a influência hídrica na germinação de sementes da espécie florestal da Caatinga submetidas a diferentes niveis de irrigação. O experimento foi realizado no viveiro florestal do Centro de Saúde e Tecnologia Rural/ CSTR, Campus de Patos – PB. Para o experimento, utilizando sementes de espécie florestal do bioma Caatinga: Sabiá, Mimosa caesalpiniifolia Benth. Num delineamento inteiramente casualisados (DIC), com 5 tratamentos, ou seja, 5 diferentes niveis de irrigação (L) de acordo com as necessidades hídricas das plantas (NH), sendo os seguintes: L1 (100%NH); L2 (80%NH); L3(60%NH); L4(40%NH) e L5(20%NH). Foram avaliadas: porcentagem de germinação (PG); Índice de velocidade de germinação (IVG); tempo médio (TM) e velocidade média (VM) de germinação. Ao comparar a lâmina de irrigação de 60% NH com a de 100% NH, houve redução aproximadamente 60% na porcentagem de germinação, sendo notório a influência da umidade nesta fase. Ao utilizar 60% da necessidade hídrica da cultura (NH), obteve maior porcentagem de germinação e índice de velocidade de germinação, sendo recomendada esta quantidade de água no período de germinação desta espécie florestal.

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Soil organic carbon fractions and humic substances are affected by land uses of Caatinga forest in Brazil

Cited by 19 publications

References 54 publications

Stock and indices of carbon management under different soil use systems

Stock and indices of carbon management under different soil use systems

Humic substances mitigate adverse effects of elevated temperature with potentially critical repercussions for coral reef resilience

Influencia hídrica na germinação de sementes da espécie florestal Mimosa Caesalpiniifolia Benth

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