Sentences with phrase «organic carbon input»

Sari Peura is trying to understand how microbes control the carbon cycle in habitats where the food web is sustained by external organic carbon inputs.

Sixteen years ago, the first global review of reservoir GHG emissions highlighted the potential significance of reservoir surfaces as GHG sources and postulated that factors such as age, water temperature, and organic carbon inputs could regulate fluxes (St. Louis et al. 2000).

Not exact matches

Soil organic carbon (SOC) in arable organic farming depends on inputs in crop residues, green manure, catch crops and animal manure.

A team led by scientists at Lawrence Berkeley National Laboratory found that the type of plant inputs (that is, root or needle litter) affected total carbon and nitrogen retention over 10 years, but that soil horizon (essentially, the layer of soil, such as the topsoil organic or deeper mineral layers) affected how the litter - derived soil organic material is stabilized in the long term.

The team used stable isotope labels to trace plant litter - derived carbon and nitrogen as the litter decomposed and formed soil, specifically the fraction of soil called organic matter, which comes from plant inputs and microscopic animals.

Without a regular input of organic matter, soil microbial diversity decreases and the carbon concentration is lowered.

Possible mechanisms include (iv) fertilization of phytoplankton growth in the Southern Ocean by increased deposition of iron - containing dust from the atmosphere after being carried by winds from colder, drier continental areas, and a subsequent redistribution of limiting nutrients; (v) an increase in the whole ocean nutrient content (e.g., through input of material exposed on shelves or nitrogen fixation); and (vi) an increase in the ratio between carbon and other nutrients assimilated in organic material, resulting in a higher carbon export per unit of limiting nutrient exported.

In contrast to the traditional view of anthropogenic organic carbon export and degradation, we suggest that with the increase of wastewater discharge and treatment rates, wastewater DIC input may play an increasingly more important role in the coastal ocean carbon cycle.

Water from glacial landscapes is also recognized as an important source of organic carbon, 69,70 phosphorus, 71 and iron72 that contribute to high coastal productivity, so changes in these inputs could alter critical nearshore fisheries.70, 73,74,75

Soil carbon at equilibrium is a balance between decomposition driven by nutrient demands of the biota and inputs of organic residues, Anderson (1995).

Accordingly, there are three main vectors of anthropogenic impacts on marine pH: (1) emissions of CO2, and other gases affecting marine pH, to the atmosphere; (2) perturbation of watershed processes affecting the inputs of nutrients, organic and inorganic carbon, acids and carbonate alkalinity to the ocean; and (3) impacts on ecosystem structure (Table 1).

As such black carbon (BC) significantly affects soil fertility and interferes with models on soil organic matter dynamics, an accurate prediction of BC input into soils and an elucidation of the mechanisms of BC turnover is essential.