(redirected fromNitrogen cycling) Thesaurus Medical Encyclopedia nitrogen cycle n. The circulation of nitrogen in nature, consisting of a cycle of chemical reactions in which nitrogen from the atmosphere is fixed in compounds in soil or water, assimilated by plants and animals, released to the soil...
cycling of nitrogen. These latter processes lead to a loss of usable fixed nitrogen from the soil. Overall, the input rate from biological, spontaneous (e.g., lightning), and industrialnitrogen fertilizer(by the Haber–Bosch process) production is slightly higher than the loss rate. Of these,...
Diagram of the nitrogen cycle Nitrogen exists in nature in several inorganic compounds, namely N2, N2O, NH3, NO2-, and NO3-, and in several organic compounds such as amino acids, nucleotides, amino sugars, and vitamins. In the biosphere, biological and chemical reactions continually occur in ...
To test whether environment-derived, carcass-derived, or the combined microbial communities exhibited a greater influence on C and N cycling, we conducted controlled laboratory experiments that combined carcass decomposition fluids and soils to simulate carcass decomposition hotspots. We selectively ...
We constructed a nitrogen cycling pathway diagram for C. nasus aquaculture ponds. The nitrogen cycle functional analysis showed that adding probiotics to the water could increase the relative abundance of the amoC_B and hao (Nitrification pathways) and the nirS and nosZ (Denitrification pathways). ...
Nitrogen fixation (see also Chapter 4 by Carpenter and Capone, this volume), the process by which certain prokaryotes can reduce atmospheric N2 gas to ammonium via the nitrogenase enzyme pathways has long been thought to be important linchpin of nitrogen cycling and productivity in coral reef syste...
Climate change affects agricultural N cycling mainly through its impact on changing patterns of temperature and rainfall. Effects also occur due to changes in the chemical climate—in particular via changes in atmospheric concentrations of ozone (O3) and carbon dioxide (CO2). ...
Microbial nitrogen use efficiency (NUE) describes the partitioning of organic N taken up between growth and the release of inorganic N to the environment (that is, N mineralization), and is thus central to our understanding of N cycling. Here we report empirical evidence that microbial decomposer...
Fig. 4: Functional analysis of nitrogen cycling genes in different treatment groups. a Heat map of microbial functional gene distribution. b Intergroup difference map of abundance of key genes in nitrogen cycle. Red and green indicate up-regulated and down-regulated abundance of the gene in the ...
6e), such that the water temperature was not an influential factor in determining groundwater N cycling. Implications and uncertainties This study explored the drivers of mean nitrate concentration in groundwater at different aquifer depths under gradients of climate, geographical factors and ...