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  • 1
    Online Resource
    Online Resource
    CO2 production in anthropogenic Chinampas soils in Mexico City .
    Frontiers Media SA ; 2014
    In:  Spanish Journal of Soil Science Vol. 2 ( 2014-9-05)
    Details
    In: Spanish Journal of Soil Science, Frontiers Media SA, Vol. 2 ( 2014-9-05)
    Abstract: We studied microbial-associated CО 〈 sub 〉 2 〈 /sub 〉 production in anthropogenic 〈 em 〉 chinampas 〈 /em 〉 soils. The soils were constructed by the accumulation of materials such as organic matter and loamy lacustrine sediments in Pre-Hispanic cultures in Mexico. To study the temperature sensitivity of CО 〈 sub 〉 2 〈 /sub 〉 production related to soil depth, moisture and oxygen availability, soil samples were collected at depths of 0-7, 7-18, 18-30, 30-40 and 40-50 cm. The soil samples were incubated under aerobic and anaerobic conditions at controlled temperatures (-5, 0, 5, 10, 20, 30 °C) and soil moistures of 10, 30, 60 and 90% water-filled pore space. For all the soil depths, incubation temperatures and soil moistures, the mean rate of aerobic CO 〈 sub 〉 2 〈 /sub 〉 production was 58.0 mg CO 〈 sub 〉 2 〈 /sub 〉 kg 〈 sup 〉 -1 〈 /sup 〉 d 〈 sup 〉 -1 〈 /sup 〉 and that of anaerobic CO 〈 sub 〉 2 〈 /sub 〉 production 31.2 mg CO 〈 sub 〉 2 〈 /sub 〉 kg 〈 sup 〉 -1 〈 /sup 〉 d 〈 sup 〉 -1 〈 /sup 〉 , with the highest rate found in the soil samples collected at a depth of 0-7 cm. A decrease in soil organic carbon content inhibited CO 〈 sub 〉 2 〈 /sub 〉 production more under anaerobic than aerobic conditions. The dependence of aerobic СО 〈 sub 〉 2 〈 /sub 〉 production on soil moisture increased at what constituted both unusually high and low temperatures for the study area. Since the response of СО 〈 sub 〉 2 〈 /sub 〉 production to temperature was lower under anaerobic than aerobic conditions, the increase in soil moisture content led to a decrease in the temperature sensitivity of СО 〈 sub 〉 2 〈 /sub 〉 production. The response of microbial activity to other factors may be modified under what constitutes the limiting conditions for any of the factors considered, as follows: (i) when anaerobiosis increases in the soil, the limiting effect of substrate availability on microbial activity increases; (ii) the CO 〈 sub 〉 2 〈 /sub 〉 production rate becomes more dependent on soil moisture under temperature stress; (iii) the sensitivity of CO 〈 sub 〉 2 〈 /sub 〉 production to temperature is highest under drought stress.
    Type of Medium: Online Resource
    ISSN: 2253-6574
    URL: Article
    DOI: 10.3232/SJSS.2012.V2.N2.04
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2014
    detail.hit.zdb_id: 2700695-5
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  • 2
    Online Resource
    Online Resource
    Artrópodos edáficos en diferentes usos de suelo de la Sierra Nevada, Tepetlaoxtoc, Estado de México, México
    Universidad del Valle ; 2022
    In:  Revista Colombiana de Entomología Vol. 48, No. 1 ( 2022-05-21)
    Details
    In: Revista Colombiana de Entomología, Universidad del Valle, Vol. 48, No. 1 ( 2022-05-21)
    Abstract: Este estudio tuvo como objetivo describir la diversidad y abundancia de los micro artrópodos edáficos, en relación con las características físicas y químicas de suelos bajo diferente uso y manejo, así como caracterizar su estructura en un área de minería pétrea o de cantera.  Para esto se estudiaron los ensamblajes de microartrópodos edáficos en cinco zonas con diferente uso de suelo: Bosque de Pino-Encino conservado (B), Bosque de Pino-Encino degradado (Z), Agrícola (V), Erosión (E), y Mina (M), en Sierra Nevada (Tepetlaoxtoc, México), su relación con parámetros físicos y químicos del suelo y su potencial como bioindicadores, utilizando los valores del índice QBS-ar, en zonas de minería pétrea. Se encontró correlación positiva y significativa con la abundancia y los porcentajes de humedad y materia orgánica del suelo. Se identificaron grupos descritos como bioindicadores, hiperparasitoides y depredadores en sitios más conservados que los que presentan mayor degradación. Los valores del índice QBS-ar fueron mayores en el área B. Se identificaron tres zonas, B, M y E, definidas por su aptitud para realizar acciones de rehabilitación ecológica y el potencial de los microartrópodos para ser integrados en los programas de manejo y estrategias de conservación y rehabilitación en áreas de minería pétrea. 
    Type of Medium: Online Resource
    ISSN: 2665-4385 , 0120-0488
    URL: Issue
    URL: Article
    DOI: 10.25100/socolen.v48i1
    DOI: 10.25100/socolen.v48i1.11632
    Language: Unknown
    Publisher: Universidad del Valle
    Publication Date: 2022
    detail.hit.zdb_id: 2518443-X
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Soil contribution to CO2 fluxes in Chinampa ecosystems, Mexico
    Frontiers Media SA ; 2020
    In:  Spanish Journal of Soil Science Vol. 10 ( 2020-07-02)
    Details
    In: Spanish Journal of Soil Science, Frontiers Media SA, Vol. 10 ( 2020-07-02)
    Abstract: Since soil CO 〈 sub 〉 2 〈 /sub 〉 flux is a key component of ecosystem carbon balance, quantifying its contribution to the ecosystem carbon flux and understanding the factors that underlie its temporal variation is crucial for a better comprehension of ecosystem carbon dynamics under climate change and for optimal ecosystem use and management. Our objectives were to quantify the contributions of total soil CO 〈 sub 〉 2 〈 /sub 〉 efflux ( 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 ) to ecosystem respiration ( 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 ) and heterotrophic soil CO 〈 sub 〉 2 〈 /sub 〉 efflux ( 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 ) to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 in two 〈 em 〉 chinampa 〈 /em 〉 ecosystems with different natural grass covers. We also aimed to identify the main environmental drivers of seasonal variability of these contributions. The CO 〈 sub 〉 2 〈 /sub 〉 fluxes were measured on each site about every 14 days from September 2008 to August 2009 in the Xochimilco Ecological Park in Mexico City using dark chamber techniques. For two studied sites, 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 , 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 were estimated on average as 94.1 ± 8.5, 34.7 ± 3.5 and 16.5 ± 1.7 (± S.E.) mg C-CO 〈 sub 〉 2 〈 /sub 〉 m 〈 sup 〉 -2 〈 /sup 〉 h 〈 sup 〉 -1 〈 /sup 〉 , respectively. & nbsp;On average over the study period and sites, the annual cumulative 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 , 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 fluxes were 824 ± 74, 304 ± 31 and 145 ± 15 g C m 〈 sup 〉 -2 〈 /sup 〉 year, respectively. The 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 , 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 varied between the winter and summer seasons; this variation was explained mostly by seasonal variations of soil temperature, soil water content and shoot plant biomass. Temperature sensitivity of CO 〈 sub 〉 2 〈 /sub 〉 fluxes depended on vegetation type and plant growth differences among the sites and decreased in the following order: 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 & gt; 〈 em 〉 R 〈 /em 〉 〈 sub 〉 s 〈 /sub 〉 & gt; 〈 em 〉 R 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 . The contribution of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 to 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 for the two studied sites and period averaged about 38% and 50%, respectively regardless of the site vegetation type, but the degree of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 / 〈 em 〉 R 〈 /em 〉 〈 sub 〉 E 〈 /sub 〉 and 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 / 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 variability depended on the differences in seasonal dynamics of plant cover. The contribution of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 varied from 37% in summer to 73% in winter at the site without a seasonal shift in dominant plant species, but 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 / 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 was close to constant during the year at the site with a seasonal change in dominant plant species. During the cold period, the contribution of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 to 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 increased following plant growth decrease. The linear regression analysis showed that plant biomass was the dominant factor controlling the seasonal variation of 〈 em 〉 F 〈 /em 〉 〈 sub 〉 H 〈 /sub 〉 / 〈 em 〉 F 〈 /em 〉 〈 sub 〉 S 〈 /sub 〉 ratios, whereas the plant biomass dynamic followed the dynamics of soil water content, water table depth, and soil temperature. Our results suggest that seasonal variation of soil contribution to total fluxes from the 〈 em 〉 chinampa 〈 /em 〉 ecosystem is locally differentiated. These differences were related to differences in seasonal dynamics of cover productivity which has been associated with localization of soil water content. This finding has important implications for assessing the contribution of the chinampa ecosystem to the global carbon budget.
    Type of Medium: Online Resource
    ISSN: 2253-6574
    URL: Article
    DOI: 10.3232/SJSS.2020.V10.N2.04
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2020
    detail.hit.zdb_id: 2700695-5
    Location Call Number Limitation Availability
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    Online Resource
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