25.12.2012 Views

BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

elow.<br />

The nitrogen cycle.<br />

1<br />

Agricnlrllre’s lossa go<br />

IO the atmosphere, ground<br />

waterandtosrramsandlakcs.<br />

The discharges to streams and<br />

lakes are augmented by the<br />

QIastewaterdiscbquMre<br />

being nansporwd m nearshorr<br />

vxersandkrthcroninm<br />

open sea. oll the rou- lKnvwer,<br />

a considerable rnmtixmation<br />

and in many CPICS<br />

directremovaltakcsplacqin<br />

particular of nitrogen.<br />

Part of the loss, the ammonia volatilization, will be carried through the<br />

atmosphere and deposit again with precipitation or directly from the air. This<br />

source forms a considerable part of the nitrogen load in marine areas and non<br />

cultivated areas.<br />

The reminder of the nitrogen loss percolates from the root zone and further on<br />

to the groundwater. In areas with tile drains a considerable part will be carried<br />

directly into watercourses. Some of the nitrogen reaching the groundwater will<br />

be removed through natural reduction processes. Another removal of nitrogen<br />

takes place in wetlands, lakes and inlets so that only part of the agricultural<br />

nitrogen discharge reaches the costal waters.<br />

210

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!