Selection of forest species for the rehabilitation of disturbed soils in oil fields in the Ecuadorian Amazon

Villacís, Jaime; Casanoves, Fernando; Hang, Susana; Keesstra, Saskia; Armas, Cristina

doi:10.1016/j.scitotenv.2016.05.102

Cited by 40 publications

(24 citation statements)

References 68 publications

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“…Breton et al () suggested that the gain in terms of plant survival and growth can be possibly decisive in revegetation work contexts, especially when extreme climatic events occur under wood chip amendments. Some tree species are the most suitable for restoration of oil fields in Amazon Basin (Villacís et al , ). Moreover, soil water repellency can stimulate land degradation processes by reducing the affinity of soil and water, thereby changing soil substrate contents and physical property (Keesstra et al , ).…”

Section: Discussionmentioning

confidence: 99%

Effects of Ant Mounds on the Plant and Soil Microbial Community in an Alpine Meadow of Qinghai–Tibet Plateau

Wang

et al. 2017

Land Degrad Dev

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Ants are important soil engineers, affecting the structure and function of ecosystems. To address the impacts of ants (Camponotus herculeanus) on the properties of an alpine meadow ecosystem of Qinghai–Tibet Plateau, we investigated the effects of ant mounds on plant biomass, soil physicochemical properties, microbial diversity, and functions. We found that the total biomass of plant community was significantly greater in ant mound periphery. Plant species richness in ant mounds was reduced compared with that of control plots without ant mounds. Significant changes in physicochemical properties of soil were also observed. Soil organic matter, total nitrogen, available phosphorous, total potassium, and available potassium increased in ant mound soil due to the excavation activities by ants as well as the accumulation of organic matter and other nutrients during mound construction. For example, roots/soil contents (g/g) and soil moisture in ant mound soils were lower than those in controls. Microbial community composition and microbial biomass were clearly changed in ant mound soils. BIOLOG analysis further indicated that the functional diversity of the microbial community of ant mound soil increased and differed from that of controls. This study indicates that ant‐induced modification of soil properties indirectly influences plant biomass and species composition, and ant mounds have different microbial communities from those of control soil. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Effects of Ant Mounds on the Plant and Soil Microbial Community in an Alpine Meadow of Qinghai–Tibet Plateau

Wang

et al. 2017

Land Degrad Dev

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“…For this reason, the alternatives for conservation of germplasm must include: assisted natural regeneration (passive restoration), protecting the remnants of tropical forest in which it is found (Abiyu et al 2016); or harvesting of the seeds and producing plants in greenhouses for subsequent introduction into the ecosystem in cuestion. Considering that this is a late species with requirements for shade in its first stage of life (Krause et al 2012), it can be transplanted at four months of age in order to maximize its possibility of survival (Villacís et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Seed germination in <em>Ormosia macrocalyx</em>, an endangered tropical forest tree

et al. 2017

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Background: Ormosia macrocalyx is a tropical forest tree classified as endangered. Its seeds experience problems of dispersion and apparent physical dormancy due to their hard seed coating. Hypotheses: 1) The stages of dehiscence of the fruits of Ormosia macrocalyx influence the germinative behavior of its seeds. 2) Pregerminative treatments will improve the germination process of the seeds stored under refrigeration. Study species: Ormosia macrocalyx Study site and period: Villahermosa, Tabasco, Mexico from October 2012 to October 2014 Methods: Two completely randomized experiments were conducted in order to analyze the germination process by 1) evaluating germination in seeds from fruit at three stages of dehiscence (closed, semi-open, and open fruit) and 2) applying four treatments, including three pregerminative treatments (water soaking for 24 h, mechanical scarification and scarification+1% gibberellic acid) plus an untreated control, to seeds stored under refrigeration for 17 months. Results: Differences were found in germination rate (GR), corrected germination rate (CGR) and time to attain 50 % germination (T 50 ) among treatments in the first experiment, with the seeds from open fruits presenting the lowest response (3.31 % day -1 for GR and CGR, and 15.8 days for T 50 ), although all treatments showed similar times for the initiation of germination (GI) and final germination percentage (GP). In the second experiment, the effect of scarification was greater than both the control and soaking treatments. Scarification treatment values were 68.0 % (GP), 12.0 days (GI), 4.53 % day -1 (GR), 6.65 (CGR) and 14.5 days (T 50 ). Addition of gibberellic acid did not produce any further advantage over scarification alone. Conclusions:Seeds from open fruits have lower germination rates, although the final GP is not affected. Stored seeds present physical dormancy but lose viability with storage and, when collected after remaining attached to the tree for undefined periods, scarification can greatly improve their germination rate. Key words: fruit maturation, dormancy, pregerminative treatments, storage Germinación de semillas de Ormosia macrocalyx, un árbol forestal amenazado ResumenAntecedentes: Ormosia macrocalyx es un árbol tropical amenazado. Sus semillas tienen problemas de dispersión y aparente latencia física por cubierta seminal dura. Hipótesis: 1) Las etapas de dehiscencia de los frutos de Ormosia macrocalyx repercutirán en el comportamiento germinativo de sus semillas. 2) Los tratamientos pregerminativos mejorarán el proceso germinativo de las semillas almacenadas en refrigeración Especie de estudio: Ormosia macrocalyx Ducke. Sitio de estudio y fechas: Villahermosa, Tabasco, México, octubre 2012-octubre 2014 Métodos: Se establecieron dos experimentos completamente aleatorios para analizar el proceso de la germinación: 1) Evaluación de la germinación en semillas de frutos en tres estados de madurez (cerrados, semi-abiertos y abiertos), y 2) Aplicación de cuatro tratamientos, tres pregerminativos (r...

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“…For particle size analysis, soil samples, dried to the air-dry state, were ground in a porcelain mortar with a pestle with a rubber tip and passed through a 2 mm mesh sieve. The granulometric composition of the samples as a whole was determined by the sieve method (fine earth fraction <2 mm) by laser diffraction (particle size distribution from 0.01 to 2000 μm) on a size analyzer particles (SALD-2300, SHIMADZU, Japan) (Fraunhofer, 1817;Vadjunina, Korchagina, 1973;Shein et al, 2017;. The total composition was determined by the X-ray fluorescence method (Pioneer S4, Bruker AXS, Germany) using the silicate analysis technique.…”

Section: Objects and Methodsmentioning

confidence: 99%

Biogeochemical Characteristics of Soils in the Dzunbayan Oil-Producing Area (Eastern Mongolia)

2019

Biogeosystem Technique

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For balances approach to Sustainable Development Goals, the physical and chemical degradation of soils, biological degradation of soil organic matter in result of oil pollution were studied. The data on the particle-size distribution, the content of chemical components and the number of microorganisms in the soils of the Dzunbayan (East Gobi) oil-producing area are presented. The studied soils are characterized by a bimodal distribution of particles: the main fraction is coarse sand (200-2000 µm), it ranges from 40 to 60 %. It is accompanied by fine silt (2-20 µm), its content reaches 17 %. A high content of chromium, copper, strontium, rubidium, cesium and arsenic was identified in soils, which reflect the geochemical specificity of the geological province. Due to arid climate of the study area soils are characterized by an alkaline reaction pH 8.2-8.7. Soils initially non-saline near the well are highly saline (salinity up to 0.7-1.2 %), due to the mining technologies used. The content of petroleum hydrocarbons (HC) in the soils of the study area varies from 9 to 60 mg/kg with a maximum in the vicinity of the operating well. The microbial community of soils is characterized by a high degree of adaptation to the conditions of the arid zone, salinity, high pH values, at the same time these conditions limit the development of typical representatives of soil microbiocenoses -actinomycetes and, to a greater extent, microscopic fungi. The total number of heterotrophic bacteria (TNH) in the studied soil samples varied within 1.22-3.49 10 6 CFU/g of dry soil, the share of hydrocarbon oxidizing bacteria (HOB) was 12.6-18.9 % of TNH. The content of hydrocarbon oxidizing bacteria (HOB) in the microbial community of soil (within 20 %) corresponds to the concentration boundary of pollution by hydrocarbons for the studied soils (up to 60 mg/kg), which indicates that the microbial community is on the verge of fulfilling the ability to self-purification of the soil. The identified physico-chemical characteristics of the studied soils of the desert zone (dominance of sand fractions, high pH values, salinity) in combination with specific climatic conditions and features of * Corresponding author E-mail addresses: gkharitonova@mail.ru (G. Kharitonova) the oil composition of the Dzunbayan deposit (prevalence of heavy paraffin fractions) characterize their low potential for self-purification from pollution by hydrocarbons. For sustainable solutions planning of the oil production, transportation, and pollution prevention the transcendental Biogeosystem Technique methodology will be helpful for Land Degradation Neutrality implementation.

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Selection of forest species for the rehabilitation of disturbed soils in oil fields in the Ecuadorian Amazon

Cited by 40 publications

References 68 publications

Effects of Ant Mounds on the Plant and Soil Microbial Community in an Alpine Meadow of Qinghai–Tibet Plateau

Effects of Ant Mounds on the Plant and Soil Microbial Community in an Alpine Meadow of Qinghai–Tibet Plateau

Seed germination in <em>Ormosia macrocalyx</em>, an endangered tropical forest tree

Biogeochemical Characteristics of Soils in the Dzunbayan Oil-Producing Area (Eastern Mongolia)

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