Environmental Engineering Reference
In-Depth Information
Table 1. Physical and chemical properties of top soil in different sampling sites
Soil
conductivity
(mS/cm
2
)
temperature
(ﾰC)
soil moisture
(cm
3
/cm
3
)
total carbon
(%)
total nitrogen
(%)
NO
3
-N
(mk/kg)
NH
4
-N
(mk/kg)
sampling site
bare land
23.58
39.82
>20
0.75
0.02
11.87
4.50
T.chinensis
;
21.89
38.62
14.84
0.88
0.03
10.24
4.09
S.glauca
21.48
37.66
13.58
0.93
0.03
7.71
4.30
P.australis
20.42
35.68
7.07
1.18
0.05
3.90
5.09
Table 2. Relationships between the flux of CO
2
and CH
4
and the air and soil temperature
soil temperature(°C)
air tempreture(°C)
Season
GHG
0cm
5cm
10cm
15cm
20cm
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
CO
2
0.135
0.549**
0.246
0.474**
0.179
0.468**
0.292
0.554**
0.155
0.568**
0.269
0.827**
0.154
0.570**
0.238
0.822**
0.98
0.614**
0.210
0.776**
0.055
0.634**
0.200
0.711**
Spring
CH
4
-0.042
0.054
0.260
-0.033
0.088
0.021
0.150
-0.086
0.040
0.086
0.310
0.046
-0.081
0.081
0.336
0.114
-0.054
0.039
0.258
0.138
-0.062
-0.015
0.208
0.160
CO
2
0.147
0.272
-0.242
0.735**
-0.008
0.165
-0.182
0.669**
0.024
0.186
-0.220
0.683**
0.084
0.173
-0.243
0.657**
0.118
0.179
-0.259
0.527**
0.155
0.195
-0.107
0.022
Summer
CH
4
0.171
-0.002
-0.199
-0.242
0.070
0.022
-0.143
-0.175
0.180
-0.033
-0.188
-0.246
0.250
-0.080
-0.208
-0.335*
0.265
-0.112
-0.232
-0.317*
0.236
-0.134
-0.160
-0.082
CO
2
0.256
0.663**
0.548**
0.891**
0.260
0.665**
0.579**
0.916**
0.260
0.675**
0.581**
0.906**
0.199
0.688**
0.475**
0.890**
0.209
0.692**
0.553**
0.877**
0.210
0.678**
0.467**
0.891**
Autumn
CH
4
0.167
-0.030
-0.105
-0.207
0.148
-0.050
-0.155
-0.126
0.163
-0.066
-0.151
-0.146
0.117
-0.065
0.131
-0.162
0.161
-0.071
-0.144
-0.166
0.114
-0.069
0.009
-0.132
CO
2
0.332
0.102
-0.336
0.251
0.280
0.071
-0.511
0.463
0.409
-0.075
-0.376
0.424
0.530*
-0.238
-0.258
0.422
0.545*
-0.421
-0.219
0.205
0.543*
-0.354
0.327
0.044
Winter
CH
4
0.464
-0.325
0.078
-0.258
0.420
-0.325
0.208
-0.238
0.527*
-0.338
0.418
-0.106
0.620*
0.336
0.565*
-0.003
0.611*
-0.348
0.616*
0.261
0.613
-0.351
0.706**
-0.030
Correlation is significant at the 0.05 level;
**
Correlation is significant at the 0.01 level. The same below.
*
A: bare land, B:
T.chinensis
, C:
S.glauca
, D:
P.australis.
