Biogeochemical domain

These data suggest that biogeochemical domains undergo a systems switch on time scales required for return of exported nutrients to the sea surfece. In oligotrophic waters, this return requires decades to centuries as the strong density stratification at these sites forces the return to proceed through the meridional overturning circulation. 

The four major biogeochemical zones, thus defined, are the polar, easterly, and trade domains. A fourth zone is defined to encompass the coastal regions. The major functional characteristics of these domains are presented in Table 24.5. 

Domain (1) A biological grouping above the kingdom level, i.e. Prokaryotes, Eukaryotes, and Archaea. (2) Biogeochemical provinces in which climate is the primary defining parameter. 

The one element whose chemical behaviour falls within the domains of both hydrolysis and organic complexation is iron. Due to the biogeochemical significance of iron in seawater, the formation behaviour of Fe(OH) 1 and... 

Archer D. E., Morford J. L., and Emerson S. (2001) A model of suboxic sedimentary diagenesis suitable for automatic tuning and gridded global domains. Global Biogeochem. Cycles (in press). 

Thus, the following links of nitrogen biogeochemical cycle were accounted for mass balance calculations in Northern-East Asia and the whole East Asian domain input — deposition, fertilizers, biological N fixation, import of food and products, riverine fluxes and output — crop uptake, denitrification, volatilization, runoff, sedimentation and sea water exchange. All calculations were condncted for 1994-1997 and the mean values were used. 

The calculation of atmospheric budgets allows us to obtain a general idea on the effect of anthropogenic activity on the environmental biogeochemical cycle of lead in European domain. These calculations include the air reservoir over European domain, 37.5 X 10 km and 4 km height (Table 29). 

It has to be bom in mind that in addition to well-recognized pollution mediated health effects, other major areas that have emerged in the 1990s in the domain of environmental pollution monitoring recently in India includes ozone layer depletion, greenhouse effect, persistence of chemical species, acidic deposition, and altered biogeochemical cycles. 

However, we are faced with a new problem if different species of unicellular organisms were necessary for carrying out different biogeochemical functions, then these different species had to exist from the very beginning of geological time. According to Vernadsky (1994, p. 459), evolution is a biospheric process and, hence, one should admit that this morphological diversity occurred somehow in a pre-evolutionary way. In contemporary science, a similar idea is defended by W. Krumbein (1996), who deftness this pre-evolutionary state as a non-Darwinian evolutionary domain. 

---