France planted Douglas-fir forests; scientists later found streams draining the plantations had up to 10 times more nitrate | World News
Forests are often associated with clean water, but a study of Douglas-fir plantations in France and Luxembourg has found that the trees can be linked to much higher nitrate levels in nearby streams and groundwater. Researchers examined paired headwater catchments with different land covers, including Douglas-fir, spruce, deciduous forests, grassland, and clearcuts. The catchments were…