Methane Production and Consumption in Loess Soil at Different Slope Position
Table 3
CH4 consumption, CO2 evolution, and O2 uptake in soils collected from three slope positions and incubated with 5 kPa methane for 21 days (average values ± standard error, ).
Slope position
Soil depth (cm)
CH4 consumption
CO2 evolution (mg C kg−1)
O2 uptake % (v/v)
Total (mg C kg−1)
% of initial CH4
Rate (mg C kg−1 d−1)
Top
0–20
130.84 ± 2.31
100
−16.08
186.7 ± 11.4
11.14 ± 0.53
20–40
17.80 ± 2.62
14
−0.799
83.9 ± 2.86
2.55 ± 0.11
Middle
0–20
121.36* ± 0.01
100
−20.66
198.9 ns ± 3.57
11.77 ns ± 0.34
20–40
131.71* ± 0.80
100
−12.26
224.1*** ± 5.26
13.63*** ± 0.32
Bottom
0–20
130.96 ns ± 43.7
100
−17.58
151.9 ns ± 5.34
9.44 ns ± 0.38
20–40
116.49*** ± 12.2
92
−7.954
104.1** ± 3.14
6.99*** ± 0.50
*, **, ***, different from the Top (reference) soil at , , and , respectively, according to Student’s t-test; ns—not significant difference.
