The Experts below are selected from a list of 24447 Experts worldwide ranked by ideXlab platform
Caixian Tang - One of the best experts on this subject based on the ideXlab platform.
-
The impact of long-term liming on soil organic carbon and aggregate stability in low-Input Acid soils
Biology and Fertility of Soils, 2016Co-Authors: Nang Seng Aye, P W G Sale, Caixian TangAbstract:This study used two field trials with 5 and 34 years of liming histories, respectively, and aimed to elucidate the long-term effect of liming on soil organic C (SOC) in Acid soils. It was hypothesized that long-term liming would increase SOC concentration, macro-aggregate stability and SOC concentration within aggregates. Surface soils (0–10 cm) were sampled and separated into four aggregate-size classes: large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), micro-aggregates (0.053–0.25 mm) and silt and clay fraction (
-
the impact of long term liming on soil organic carbon and aggregate stability in low Input Acid soils
Biology and Fertility of Soils, 2016Co-Authors: Nang Seng Aye, P W G Sale, Caixian TangAbstract:This study used two field trials with 5 and 34 years of liming histories, respectively, and aimed to elucidate the long-term effect of liming on soil organic C (SOC) in Acid soils. It was hypothesized that long-term liming would increase SOC concentration, macro-aggregate stability and SOC concentration within aggregates. Surface soils (0–10 cm) were sampled and separated into four aggregate-size classes: large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), micro-aggregates (0.053–0.25 mm) and silt and clay fraction (<0.053 mm) by wet sieving, and the SOC concentration of each aggregate-size was quantified. Liming decreased SOC in the bulk soil and in aggregates as well as macro-aggregate stability in the low-Input and cultivated 34-year-old trial. In contrast, liming did not significantly change the concentration of SOC in the bulk soil or in aggregates but improved macro-aggregate stability in the 5-year-old trial under undisturbed unimproved pastures. Furthermore, the single application of lime to the surface soil increased pH in both topsoil (0–10 cm) and subsurface soil (10–20 cm) and increased K2SO4-extractable C, microbial biomass C (Cmic) and basal respiration (CO2) in both soil layers of both lime trials. Liming increased the percentage of SOC present as microbial biomass C (Cmic/Corg) and decreased the respiration rate per unit biomass (qCO2). The study concludes that despite long-term liming decreased total SOC in the low-Input systems, it increased labile C pools and the percentage of SOC present as microbial biomass C.
Nang Seng Aye - One of the best experts on this subject based on the ideXlab platform.
-
The impact of long-term liming on soil organic carbon and aggregate stability in low-Input Acid soils
Biology and Fertility of Soils, 2016Co-Authors: Nang Seng Aye, P W G Sale, Caixian TangAbstract:This study used two field trials with 5 and 34 years of liming histories, respectively, and aimed to elucidate the long-term effect of liming on soil organic C (SOC) in Acid soils. It was hypothesized that long-term liming would increase SOC concentration, macro-aggregate stability and SOC concentration within aggregates. Surface soils (0–10 cm) were sampled and separated into four aggregate-size classes: large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), micro-aggregates (0.053–0.25 mm) and silt and clay fraction (
-
the impact of long term liming on soil organic carbon and aggregate stability in low Input Acid soils
Biology and Fertility of Soils, 2016Co-Authors: Nang Seng Aye, P W G Sale, Caixian TangAbstract:This study used two field trials with 5 and 34 years of liming histories, respectively, and aimed to elucidate the long-term effect of liming on soil organic C (SOC) in Acid soils. It was hypothesized that long-term liming would increase SOC concentration, macro-aggregate stability and SOC concentration within aggregates. Surface soils (0–10 cm) were sampled and separated into four aggregate-size classes: large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), micro-aggregates (0.053–0.25 mm) and silt and clay fraction (<0.053 mm) by wet sieving, and the SOC concentration of each aggregate-size was quantified. Liming decreased SOC in the bulk soil and in aggregates as well as macro-aggregate stability in the low-Input and cultivated 34-year-old trial. In contrast, liming did not significantly change the concentration of SOC in the bulk soil or in aggregates but improved macro-aggregate stability in the 5-year-old trial under undisturbed unimproved pastures. Furthermore, the single application of lime to the surface soil increased pH in both topsoil (0–10 cm) and subsurface soil (10–20 cm) and increased K2SO4-extractable C, microbial biomass C (Cmic) and basal respiration (CO2) in both soil layers of both lime trials. Liming increased the percentage of SOC present as microbial biomass C (Cmic/Corg) and decreased the respiration rate per unit biomass (qCO2). The study concludes that despite long-term liming decreased total SOC in the low-Input systems, it increased labile C pools and the percentage of SOC present as microbial biomass C.
P W G Sale - One of the best experts on this subject based on the ideXlab platform.
-
The impact of long-term liming on soil organic carbon and aggregate stability in low-Input Acid soils
Biology and Fertility of Soils, 2016Co-Authors: Nang Seng Aye, P W G Sale, Caixian TangAbstract:This study used two field trials with 5 and 34 years of liming histories, respectively, and aimed to elucidate the long-term effect of liming on soil organic C (SOC) in Acid soils. It was hypothesized that long-term liming would increase SOC concentration, macro-aggregate stability and SOC concentration within aggregates. Surface soils (0–10 cm) were sampled and separated into four aggregate-size classes: large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), micro-aggregates (0.053–0.25 mm) and silt and clay fraction (
-
the impact of long term liming on soil organic carbon and aggregate stability in low Input Acid soils
Biology and Fertility of Soils, 2016Co-Authors: Nang Seng Aye, P W G Sale, Caixian TangAbstract:This study used two field trials with 5 and 34 years of liming histories, respectively, and aimed to elucidate the long-term effect of liming on soil organic C (SOC) in Acid soils. It was hypothesized that long-term liming would increase SOC concentration, macro-aggregate stability and SOC concentration within aggregates. Surface soils (0–10 cm) were sampled and separated into four aggregate-size classes: large macro-aggregates (>2 mm), small macro-aggregates (0.25–2 mm), micro-aggregates (0.053–0.25 mm) and silt and clay fraction (<0.053 mm) by wet sieving, and the SOC concentration of each aggregate-size was quantified. Liming decreased SOC in the bulk soil and in aggregates as well as macro-aggregate stability in the low-Input and cultivated 34-year-old trial. In contrast, liming did not significantly change the concentration of SOC in the bulk soil or in aggregates but improved macro-aggregate stability in the 5-year-old trial under undisturbed unimproved pastures. Furthermore, the single application of lime to the surface soil increased pH in both topsoil (0–10 cm) and subsurface soil (10–20 cm) and increased K2SO4-extractable C, microbial biomass C (Cmic) and basal respiration (CO2) in both soil layers of both lime trials. Liming increased the percentage of SOC present as microbial biomass C (Cmic/Corg) and decreased the respiration rate per unit biomass (qCO2). The study concludes that despite long-term liming decreased total SOC in the low-Input systems, it increased labile C pools and the percentage of SOC present as microbial biomass C.
C. M. Heyes - One of the best experts on this subject based on the ideXlab platform.
-
Imagination and imitation: Input, Acid test, or alchemy?
Behavioral and Brain Sciences, 1996Co-Authors: C. M. HeyesAbstract:AbstractImmediate imitation is likely to be a major, direct Input to Barresi & Moore's level 2 competence, but deferred imitation is unlikely to play a key role in the transition to level 3, because (1) the attribution of first person knowledge is neither a necessary cause nor an obvious consequence of deferred imitation, and (2) deferred imitation does not correlate phylogenetically with capacities that more plausibly either yield or reflect a concept of intentional agency.
Arne Henriksen - One of the best experts on this subject based on the ideXlab platform.
-
Total organic carbon in streamwater from four long-term monitored catchments in Norway
Environment International, 1994Co-Authors: Espen Lydersen, Arne HenriksenAbstract:By linear regression analyses, flux, concentration, and net charge (NC in μeq/mg C) of total organic carbon (TOC) have been related to different physico-chemical parameters present in air/precipitation and streamwater at four long-term monitored catchments in Norway, during the period 1986–1992. The catchments vary a lot with respect to annual water Input, Acid rain, and the streamwater concentration of TOC. Thus, relationships between concentration/NC of TOC and chemical compounds in precipitation and streamwater were often catchment-specific. However, seasonal climatic changes, like air temperature and hydrology, were found to be important for the concentration variations of TOC. The correlation between concentration of nonmarine base cations (ΣBC∗) and concentration of TOC at the four sites was far more significant (r=0.86) than the corresponding correlation between nonmarine sulphate (SO4∗) and ΣBC∗ (r=0.57). This indicates the important role of organic matter in weathering reactions in the catchment. Concerning weathering and cation leaching of aluminum, the correlation between concentration of total aluminum (RAL) and SO4∗ was far more significant (r=0.93) compared with corresponding correlation between RAL and TOC (r=0.40). This should be expected, because a high concentration of SO4∗ means a low pH, which is needed to dissolve substantial amounts of Al from soils. The NC of TOC was found to be most affected by compounds in precipitation, primarily the Inputs of sea salts. In the most Acidified areas, the influence from strong Acid Inputs also affects the NC of TOC, but less significantly. The concentration of Na+ in precipitation is much higher and the variations much larger compared with the concentration of H+ in precipitation in the coastal areas, like Birkenes and especially Kaarvatn. Thus, it is reasonable that the variations in sea salt Inputs (primarily NaCl) are more important for the temporary variation in NC of TOC compared with H+ ions at these sites. Only at Langtjern, the most TOC-influenced site, a significant and positive correlation was found between H+ and the concentration of TOC in streamwater. This indicates that at a certain TOC level, the weak organic Acids may affect the streamwater pH. A comparison between measured and calculated concentrations of organic Al indicated that the dissociation constants (pK-values) of the organic Acids present at Birkenes must be higher and/or the Al-complexing constants lower compared with the constants given by the programme. At the three other sites, it was the other way around. This may explain why a negative correlation between concentrations of TOC and labile Al was present at Birkenes, while the other sites exhibited a corresponding positive correlation with respect to labile Al or ΣAln+. The comparison also documented larger differences in these constants between the sites, compared with monthly variations in the constants at one single site.