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| Ferreira,Carlas Renata Prissila Costa; Antonino,Antonio Celso Dantas; Sampaio,Everardo Valadares de Sá Barreto; Correia,Karina Guedes; Lima,José Romualdo de Sousa; Soares,Willames de Albuquerque; Menezes,Rômulo Simões Cezar. |
| ABSTRACT The CO2 emission from the soil surface, commonly referred to as soil CO2 efflux (ECO2) or soil respiration, is the sum of processes that include root respiration and microbial activity. Measuring this evolution is important to establish sustainable land use models and to estimate global fluxes of carbon, which affect climate change. Despite its importance, few measurements have been made in areas of the semiarid Brazilian Northeast region, and most of them were made using the alkali absorption method (AA), which can underestimate ECO2. Measurements using AA were compared to measurements using the infrared gas analyzer method (IRGA) over ten months (in rainy and dry seasons), during the day and night, in areas of Caatinga (xeric shrubland and thorn... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CO2 emission; Rainy season; Dry season; Caatinga; Pasture. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100400 |
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| Tavares,Rose Luiza Moraes; Souza,Zigomar Menezes de; Scala Jr,Newton La; Castioni,Guilherme Adalberto Ferreira; Souza,Gustavo Soares de; Torres,José Luiz Rodrigues. |
| ABSTRACT The sugarcane green harvest system, characterized by mechanized harvesting and the absence of crop burning, affects soil quality by increasing crop residue on the soil surface after harvest; thus, it contributes to improving the physical, chemical, and microbiological properties and influences the soil carbon content and CO2 flux (FCO2). This study aimed to evaluate the spatial and temporal variability of soil FCO2 in sugarcane green harvest systems. The experiment was conducted in two areas of sugarcane in São Paulo, Brazil: the first had a 5-year history of sugarcane green harvest (SG-5) and the second had a longer history of 10 years (SG-10). The temporal FCO2 were evaluated in the dry and rainy periods, and spatial variability in the dry... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CO2 emission; Soil respiration; Straw; Mechanized harvest; Physical properties. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100524 |
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| Liang,Yinli; Bai,Caihong; Mu,Lan; Zhou,Maojuan. |
| Crop residues are the primary source of carbon input in the soil carbon pool. Crop rotation can impact the plant biomass returned to the soil, and influence soil respiration. To study the effect of previous crops on soil respiration in cucumber (Cucumis statirus L.) fields in solar greenhouses, soil respiration, plant height, leaf area and yield were measured during the growing season (from the end of Sept to the beginning of Jun the following year) from 2007 to 2010. The cucumber was grown following fallow (CK), kidney bean (KB), cowpea (CP), maize for green manure (MGM), black bean for green manure (BGM), tomato (TM), bok choy (BC). As compared with CK, KB, CP, MGM and BGM may increase soil respiration, while TM and BC may decrease soil respiration at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf area; CO2 emission; Plant height; Previous crop; Yield. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400012 |
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