JOVA catchments

Catchments and JOVA monitoring stations are distributed nationwide.

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The JOVA catchments are geographically distributed from Bodø in the North (Naurstad) to Grimstad in the South (Vasshaglona). There are five catchments in the Central/Eastern part of the country, and two in the Western part.

JOVA has established a nationwide network of monitoring stations in small catchments dominated by agriculture (figure 1). Data from monitoring of runoff and water quality are supplemented by registrations of the farmers’ agricultural activities in the catchment area. The data collection on management practices is done in close co-operation with the farmers, and provides a basis for correlating soil and crop management in the catchments with the observed water quality in the streams. In many of the catchments the monitoring includes nutrients / soil erosion as well as pesticides, while in some localities only nutrients / soil erosion or pesticides is monitored.

Characteristics of the JOVA catchments 

The JOVA catchments represent the most important agricultural areas in the country with regard to climate, soil and management practices. The monitoring includes a total of 13 catchments located in different parts of the country.

The Skuterud, Mørdre and Kolstad catchments are dominated by grain production, while Volbu, Naurstad, Time and Skas-Heigre are dominated by grass and livestock production. Hotran is characterized by a combination of grain / grass cultivation, with grain as the dominant crop. Vasshaglona is characterized by a combination of potato, vegetables and grain crops.

There have been some minor changes in the crop distribution in some of the fields through the monitoring period. In Mørdre the area of potatoes has increased in recent years, while the area of meadow grass has increased somewhat in Hotran. The area of pasture has increased in Naurstad at the expense of the meadow. Also in Volbu there has been a small increase in grazing areas. In Time and Skas-Heigre, there has been little change in farming. In Vasshaglona there has been an increase in the acreage of vegetables at the expense of potato areas.

Table 1. Characteristics of the catchments included in the monitoring programme in 2010. Temperature and precipitation are 30-years normals from The Norwegian Meteorological Institute

 

Catchment Area (decares) Cultivated area (%) Temperature (ºC) Precipitation (mm) Crops
Skuterud 4490 61 5,5 785 Grain
Mørdre 6800 65 4,3 665 Grain
Heia 1700 62 5,6 829 Vegetables, potatoes, grain
Kolstad 3080 68 4,2 585 Grain
Bye 40 100 4,2 585 Grain
Hotran 19 400 58 5,3 892 Grain, grass
Naurstad 1456 35 4,5 1020 Grass
Volbu 1680 41 1,6 575 Grass

Vasshaglona

650 62 6,9 1230 Vegetables, potatoes, grain

Time

912 94 7,1 1189 Grass

Skas-Heigre

29 300 85 7,7 1180 Grass, grain

Hobøl

331 km2 19 5,6 829 Grain

Lier

302 km2 13 5,2 940 Grain, fruit, vegetables