Introduction Conclusions References

~ Organic matter from aquatic and terrestrial sources provides the carbon energy that 'drives' aquatic food webs. Most streams and rivers are heterotrophic — that is, more carbon is consumed (e.g. by animals and bacteria) than is produced within the system by aquatic plants. However, despite the presence of vast amounts of carbon in streams and rivers, only a small proportion of the total is tr...

Soil carbon accumulation is largely dependent on net primary productivity. To our knowledge, there have been no studies investigating the dynamics of carbon accumulation in weathered subtropical soils, especially in managed eucalyptus plantations. We quantified the seasonal input of leaf litter, the leaf decomposition rate and soil carbon stocks in an commercial plantation of Eucalyptus saligna...

Soil degradation has been of great concern for New Brunswick's potato farmers, especially on sloped land and shallow soils. In this study, we evaluated the initial response labile soil carbon (C) fractions (permanganate oxidizable C (POXC) particulate organic (POC)) aggregate stability to two integrated best management practices (BMPIs) composed following individual practices: diversion terrace...

OBJECTIVE We compared the adverse effects of two types of real ambient particles; i.e., total suspended particles from an electrostatic precipitator of a steel mill and fine air particles from an urban ambient particulate matter of 2.5 µm, on mucociliary clearance. METHOD Mucociliary function was quantified by mucociliary transport, ciliary beating frequency and the amount of acid and neutral...

Important aspects of the current research on atmospheric aerosols have recently been highlighted by Andreae and Crutzen (1997). The authors state that secondary organic aerosols, formed by the oxidation of VOCs emitted from biogenic sources, probably account for a significant fraction of the particulate matter in rural and remote continental air masses. Monoterpenes (C10H16), which constitute o...

Abstract Background Revealing the variations in soil aggregate-related organic carbon (OC) and labile (LOC) fractions a chronosequence of Chinese fir plantations plays an important role better understanding impact sink or source on plantation ecosystem. In this study, samples depth 0–20 cm were collected from at different stand ages (0, 9, 17, 26 years old) Guangxi, China. With optimal moisture...

This case study investigates the effects of ventilation intervention on measured and perceived indoor air quality (IAQ) in a repaired school where occupants reported IAQ problems. Occupants' symptoms were suspected to be related to the impurities leaked indoors through the building envelope. The study's aim was to determine whether a positive pressure of 5-7 Pa prevents the infiltration of harm...

This study investigated the relationship between water-soluble organic compounds of ambient particulate matter (PM) and cellular redox activity collected from May 28 to June 20 of 2016 at the west coastal site in the Republic of Korea during the KORea-US Air Quality (KORUS-AQ) campaign. Automatic four-hour integrated samples operated at a flow rate of 92 L per minute for the analysis of organic...

Carbonaceous compounds comprise a substantial fraction of atmospheric particulate matter (PM). Particulate organic material can be emitted directly into the atmosphere or formed in the atmosphere when the oxidation products of certain volatile organic compounds condense. Such products have lower volatilities than their parent molecules as a result of the fact that adding oxygen and/or nitrogen ...