Agriculture & Biology
nitrogen cycle
100%
hardwood forests
95%
forest soils
87%
organic horizons
86%
nitrification
67%
freezing
66%
nitrous oxide
64%
Betula
60%
Betula alleghaniensis
56%
carbon
49%
Acer
45%
soil
38%
mineralization
37%
atmospheric chemistry
30%
A horizons
28%
soil horizons
26%
nitrous oxide production
25%
snowpack
25%
Acer saccharum
25%
Acer saccharum subsp. saccharum
24%
soil respiration
23%
soil carbon
22%
denitrification
22%
carbon sequestration
21%
forest ecosystems
21%
water quality
18%
interspecific variation
18%
soil fertility
17%
soil sampling
16%
climate change
15%
nitrogen
11%
temperature
7%
Earth & Environmental Sciences
forest soil
76%
freezing
68%
nitrogen
45%
carbon
42%
nitrification
34%
soil
32%
mineralization
18%
effect
17%
atmospheric chemistry
14%
soil respiration
14%
carbon storage
13%
soil fertility
13%
nitrous oxide
13%
soil carbon
12%
snow cover
12%
sugar
12%
forest ecosystem
12%
denitrification
11%
respiration
11%
incubation
10%
vessel
10%
water quality
8%
rate
8%
climate
6%
laboratory
6%
loss
6%
temperature
4%