Agriculture & Biology
urbanization
95%
ecosystems
63%
soil organic matter
59%
total nitrogen
42%
soil
42%
land use
40%
deserts
39%
regional surveys
33%
urban development
30%
soil heterogeneity
28%
nitrogen
24%
stable isotopes
21%
soil properties
20%
uncertainty
20%
environmental impact
20%
agriculture
15%
sampling
7%
Medicine & Life Sciences
Ecosystem
92%
Soil
90%
Urbanization
61%
Nitrogen
35%
Nitrogen Isotopes
22%
Urban Renewal
20%
Agriculture
13%
Uncertainty
11%
Earth & Environmental Sciences
ecosystem
49%
urbanization
45%
soil organic matter
39%
soil
35%
desert
23%
land use
18%
nitrogen
16%
soil nitrogen
16%
nitrogen isotope
16%
urban development
13%
soil property
12%
stable isotope
11%
agriculture
9%
world
7%
city
7%
analysis
7%
distribution
4%
Chemical Compounds
Ecosystem
100%
Soil Organic Matter
91%
Soil
70%
Nitrogen
50%
Stable Isotope
22%