Earth & Environmental Sciences
soil nitrogen
100%
productivity
44%
soil
36%
grassland ecosystem
26%
climate zone
26%
monoculture
26%
vegetation
26%
meta-analysis
23%
terrestrial ecosystem
21%
forest ecosystem
20%
effect
20%
plant species
19%
young
14%
degradation
14%
habitat
13%
rate
7%
Medicine & Life Sciences
Soil
93%
Nitrogen
85%
Ecosystem
57%
Grassland
25%
Forests
20%
Climate
19%
Meta-Analysis
12%
Agriculture & Biology
nitrogen
50%
soil
43%
species diversity
19%
vegetation
18%
stand age
15%
terrestrial ecosystems
15%
cropland
15%
meta-analysis
14%
forest ecosystems
14%
mineralization
12%
grasslands
10%
ecosystems
9%
degradation
7%
habitats
7%
Engineering & Materials Science
Nitrogen
80%
Soils
67%
Productivity
29%
Conservation
11%
Availability
8%
Degradation
8%
Social Sciences
productivity
53%
time
30%
habitat
24%
conservation
18%
climate
16%