Agriculture & Biology
forested watersheds
100%
chemistry
53%
old-growth forests
52%
calcium
37%
biogeochemistry
30%
atmospheric deposition
30%
forest succession
29%
Northeastern United States
26%
water
24%
forest ecosystems
22%
neutralization
20%
acidification
20%
soil
20%
cations
17%
sulfur
16%
mountains
16%
ecosystems
15%
sampling
14%
nitrogen
11%
acids
11%
Earth & Environmental Sciences
streamwater
81%
old-growth forest
49%
watershed
43%
saturation
28%
natural area
23%
biogeochemistry
22%
atmospheric deposition
21%
acidification
19%
forest ecosystem
19%
water
18%
environmental change
17%
soil
17%
cation
16%
sulfur
15%
mountain
13%
acid
12%
nitrogen
11%
ecosystem
11%
sampling
11%
effect
4%