Download Biogeochemistry of small catchments : a tool for by Jiří V Černý; Bedr̆ich Moldan PDF

By Jiří V Černý; Bedr̆ich Moldan

Unusual multinational participants current study of small catchments to ascertain quite a few environmental difficulties, particularly these of acidification, wooded area administration and land-use alterations. Divided into components, it introduces theoretical ideas through a evaluation of atmospheric deposition and assessment of weathering and erosion procedures. the second one part offers with the method of the given self-discipline, stressing novel techniques and discussing difficulties

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Example text

The loss of base cations has been shown to be quantitatively related to the speciation of the cation deposited together with the sulphate, where H+ and/or NH/ together with the leaching of sulphate cause a concomitant release of either basic nutrients (Ca2+,Mg2+, K+) or toxic acidic (H+,AI3+)cations. Nitrogen is an essential nutrient element required by plants in substantial 18 BIOGEOCHEMISTRY OF SMALL CATCHMENTS quantities. The nitrogen cycle is perhaps the most complicated among the plant nutrient cycles.

The chemical composition of natural waters strongly reflects the geology of the catchments in which they originate. The importance of the very small-scale local geological and geochemical features such as veins and other small geochemical bodies may be disproportionately important for the biogeochemical processes in catchments. Erosive processes remove the products of physical and chemical weathering. Water is the primary agent for erosion and transport of the residual materials formed by weathering.

The majorcompartmentsare bedrock, regolith (including soil), water, atmosphere and biomass. 12 BIOGEOCHEMISTRY OF SMALL CATCHMENTS Physical and chemical weathering converts bedrock into regolith and into the soil on which terrestrial vegetation grows. Erosional processes act to remove the products of weathering. Chemical weathering also plays a major role in determining the composition of natural waters (Garrels and Christ, 1965). The chemical reactions that govern the conversion of bedrock minerals into soil minerals determine the release of dissolved constituents to the waters.

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