Distribution of Organic Matter

Compared to other ecosystem types, arctic and alpine vegetation have low plant biomass and stocks of carbon, mainly because of the lack of a tree stratum and the often spotty vegetation. For 

Cop right D 2001 by Aciulemif Pre.ts. A righrs of reprodnciion in din form reserved. 

TABLE 1 Coiiiparisoiis of Carbon Pools in Arctic-Alpine Tundra, in the Neighboring Boreal Zone, and the World s Total. 

I he soil pools do not include tbe most rec.ilcitrant fractions. (After McGuire et al, 1997). 

TABLE 2 Estimates (g/m-) of Organic Matter Ma.ss in Soil, Plant Bioma.ss, and Net Primary Production (NPP) in Main Arctic Ecosystem Types. 

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The Depth Distribution of Organic Matter Oxidation in the Sediment Column... 

Figure 8 Results of a model study of the influence of the depth distribution of organic matter oxidation below the sediment-water interface on sedimentary calcite dissolution. The e-folding depth for organic C oxidation is approximately equal to l/ji. Results are shown for 3 degrees of saturation with respect to calcite - -20 p,molkg (supersaturated bottom water), 0 p,mol kg (bottom water at saturation), and —10 p,mol kg (undersaturated).

Example 15.5. Steady-State Distribution of Organic Matter in the Ocean Estimate from the data given in Figure 15.19 the residence time of organic C in the ocean. 

There are many factors that contribute toward the seemingly universal slowing in organic matter decomposition with time. One of these is that the physical form and distribution of organic matter within sediments is not uniform. A second is that the rate and extent... 

With the aim to get an impression about the distribution of organic matter in the different regions of the Baltic Sea, mean values for DOC, DON, POC, and PON as well as the C/N— ratio in the dissolved and in the particulate fraction were calculated for selected stations. The calculation is based on the 10-years period of measurements (Fig. 12.12). 

FIGURE 12.12 Distribution of organic matter in different regions of the Baltic Sea. For 13 selected stations (cf. Fig. 1.2) mean values of DOC, DON, POC, PON, and the C/N ratios in the dissolved and particulate fraction are shown. The calculation based on the data measured from 1995 to 2005 on five regular cruises per year. Mean values and standard deviations are separately calculated for the whole water column (columns), for the surface layer (circles) and, the bottom layer (triangles). (Adopted from Nausch et al., 2006.)... 

TABLE 8. Distribution of Organic Matter in 11 Florida Mucks (with Standard... 

The world-wide distribution of organic matter-rich Upper Cretaceous sediments has prompted a number of organic geochemical... 

The determination of distribution pattern of various forms of both macroelements and trace metals in soil profile is a very complicated task. We have to know the distribution of organic matter, mineral particle, and microbes, the existence of different barriers, redox conditions etc (Box 3)... 

Figure 6. Distribution of organic matter in Mahogany zine shale, Anvil Points mine, upper zone, + 20 ft to Mahogany marker...

Waksman, S. A. (1933). On the distribution of organic matter in the sea bottom and the chemical nature and origin of marine humus. Soil Sci. 36, 125-147. 

DISTRIBUTION OF ORGANIC MATTER IN LIVING MARINE ORGANISMS... 

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