Microbial indicators related to soil carbon in Mediterranean land use systems

Moscatelli, M.C.; Tizio, A. Di; Marinari, Sara; Grégo, S.

doi:10.1016/j.still.2007.08.007

Cited by 94 publications

(43 citation statements)

References 51 publications

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“…According to Araújo et al (2008), the ratio C mic /C org was significantly enhanced by organic management, improving soil microbial characteristics and slowly increasing soil organic C. Moscatelli et al (2007) verified that soil management alters the values of qCO 2 . Franchini et al (2007) reported that the decrease in qCO 2 under NT allowed enhancements in soil C stocks, such that in the 0-40 cm profile, a gain of 2500 kg of C ha -1 was observed in relation to CT, evidence of a smaller relative loss of CO 2 and, consequently a larger accumulation of C.…”

Section: Resultsmentioning

confidence: 81%

Microbial soil quality indicators under different crop rotations and tillage management

et al. 2010

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-An experiment was carried out under field conditions to assess the effects of soil management (no-tillage-NT and conventional tillage-CT) and crop rotation systems on microbial biomass-C (C mic ), basal soil respiration (BSR), metabolic quotient (qCO 2 ), soil organic carbon content (C org ) and microbial carbon to organic carbon ratio (C mic /C org ). Soil samples were collected on an area cultivated with wheat as winter crop and soybean as summer crop, both in rotation with vetch, maize and oats. Samples were also collected in a secondary forest used as reference. Data of each management system (NT and CT) were compared to forest area by "t" test (p<0.05) and crop rotations were compared by Tukey test (p<0.05). All data were submitted to multivariate analysis (Principal Component Analysis -PCA). There were observed significant differences ("t" test; p<0.05) for C mic , BSR, qCO 2 and C mic /C org between NT and CT, by which NT values resemble those for forest area. For crop rotations significant differences (Tukey test; p<0.05) were found only for BSR and qCO 2 . The sum of the two first principal components on the PCA explained about 75% of the data variation. PCA showed NT closest to forest area than CT, especially treatments with soybean and vetch as consecutive crops. The forest area-NT clustering was mostly due to C mic and C mic /C org relationship. Results indicate that the NT system is more sustainable than the CT system and can contribute for the accumulation a greater quantity of carbon in soil.Key words -Microbial biomass. Microbial respiration. Organic matter. Soil management.Resumo -Foi conduzido um experimento sob condições de campo para avaliar o efeito da forma de manejo do solo (Plantio direto -PD e plantio convencional -PC) e dos sistemas de rotação de culturas sobre o carbono da biomassa microbiana (C mic ), respiração basal do solo (RBS), quociente metabólico (qCO 2 ), carbono orgânico total (C org ) e relação carbono da biomassa microbiana: carbono orgânico total (C mic /C org ). As amostras de solo foram coletadas em uma área cultivada com trigo como cultura de inverno e soja como cultura de verão, ambas em rotação com ervilhaca, milho e aveia preta. Amostras de solo também foram coletadas em uma floresta secundária usada com referência. Os dados de cada sistema de manejo do solo (PD e PC) foram comparados com a floresta secundária pelo teste "t" (p<0.05) e as rotações de culturas foram comparadas pelo teste de Tukey (p<0.05). Todos os dados foram submetidos a uma análise multivariada (Análise de Componentes Principais -ACP). Foram observadas diferenças significativas (teste "t"; p<0.05) para C mic , RBS, qCO 2 e C mic /C org entre PD e PC, em que estes valores foram semelhantes àqueles encontrados na floresta. Entre as rotações de culturas foram observadas diferenças significativas (teste de Tukey; p<0.05) apenas para RBS e qCO 2 . A análise de componentes principais mostrou que o PD aproximou-se mais da floresta do que o PC, especialmente nos tratamentos em que soja e ervilhac...

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Section: Resultsmentioning

confidence: 81%

Microbial soil quality indicators under different crop rotations and tillage management

et al. 2010

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“…Ammonia and nitrate N were measured colorimetrically through a spectrometer. Labile soil carbon (LC) measurement was carried out by the procedure by Moscatelli et al (2007). Devices or procedure used in measuring above parameters, specific feature of the measurement were inclued in Table 2.…”

Section: Chemical Analysismentioning

confidence: 99%

Effects of rodent-induced land degradation on ecosystem carbon fluxes in an alpine meadow in the Qinghai–Tibet Plateau, China

et al. 2015

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Abstract. The widespread land degradation in an alpine meadow ecosystem would affect ecosystem carbon (C) balance. Biomass, soil chemical properties and carbon dioxide (CO 2 ) of six levels of degraded lands (D1-D6, according to the number of rodent holes and coverage) were investigated to examine the effects of rodent-induced land degradation on an alpine meadow ecosystem. Soil organic carbon (SOC), labile soil carbon (LC), total nitrogen (TN) and inorganic nitrogen (N) were obtained by chemical analysis. Soil respiration (R s ), net ecosystem exchange (NEE) and ecosystem respiration (ER) were measured by a Li-Cor 6400XT. Gross ecosystem production (GEP) was the sum of NEE and ER. Aboveground biomass (AGB) was based on a linear regression with coverage and plant height as independent variables. Root biomass (RB) was obtained by using a core method. Soil respiration, ER, GEP and AGB were significantly higher in slightly degraded (D3 and D6, group I) than in severely degraded land (D1, D2, D4 and D5, group II). Positive values of NEE average indicate that the alpine meadow ecosystem is a weak C sink during the growing season. The only significant difference was in ER among different degradation levels. R s , ER and GEP were 38.2, 44.3 and 46.5 % higher in group I than in group II, respectively. Similar difference of ER and GEP between the two groups resulted in an insignificant difference of NEE. Positive correlations of AGB with ER, NEE and GEP, and relatively small AGB and lower CO 2 fluxes in group II, suggest the control of AGB on ecosystem CO 2 fluxes. Correlations of RB with SOC, LC, TN and inorganic N indicate the regulation of RB on soil C and N with increasing number of rodent holes in an alpine meadow ecosystem in the permafrost region of the Qinghai-Tibet Plateau (QTP).

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“…This reduction of SOC stocks from AC1 to AC2, V and OG, can be explained by a degraded process (vegetation losses and unsustainable soil management) resulting in continuous impoverishment in the OM content causing low soil productivity. The SOC loss in cultivated soils could be due to the OM reduced input, as well as to the reduced physical protection of soil from erosion and the increased decomposition rate as a consequence of tillage (Jordán et al, 2010;Moscatelli et al, 2007).…”

Section: The Effect Of Luc On Soc Stock Tn and C : N Ratiomentioning

confidence: 99%

Impacts of land use change in soil carbon and nitrogen in a Mediterranean agricultural area (Southern Spain)

2013

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Abstract. The agricultural Mediterranean areas are dedicated to arable crops (AC), but in the last decades, a significant number of AC has led to a land use change (LUC) to olive grove (OG) and vineyards (V). A field study was conducted to determine the long-term effects (46 years) of LUC (AC by OG and V) and to determine soil organic carbon (SOC), total nitrogen (TN), C : N ratio and their stratification across the soil entire profile, in Montilla-Moriles denomination of origin (D.O.), in Calcic-Chromic Luvisols (LVcc/cr), an area under semiarid Mediterranean conditions. The experimental design consisted of studying the LUC on one farm between 1965 and 2011. Originally, only AC was farmed in 1965, but OG and V were farmed up to now (2011). This LUC principally affected the horizon thickness, texture, bulk density, pH, organic matter, organic carbon, total nitrogen and C : N ratio. The LUC had a negative impact in the soil, affecting the SOC and TN stocks. The conversion from AC to V and OG involved the loss of the SOC stock (52.7 % and 64.9 % to V and OG respectively) and the loss of the TN stock (42.6% and 38.1 % to V and OG respectively). With respect to the stratification ratios (SRs), the effects were opposite; 46 years after LUC increased the SRs (in V and OG) of SOC, TN and C : N ratio.

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Microbial indicators related to soil carbon in Mediterranean land use systems

Cited by 94 publications

References 51 publications

Microbial soil quality indicators under different crop rotations and tillage management

Microbial soil quality indicators under different crop rotations and tillage management

Effects of rodent-induced land degradation on ecosystem carbon fluxes in an alpine meadow in the Qinghai–Tibet Plateau, China

Impacts of land use change in soil carbon and nitrogen in a Mediterranean agricultural area (Southern Spain)

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