102
7 Effects of Conservation Practices …
Table 7.1
Distributions of water, soil, nutrients, and TRE in the Nanxiaohegou Catchment during the treatment period 1954–2004
Year
1954–1959
1960–1969
1970–1979
1980–1989
1990–1999
2000–2004
1954–2004
Precipitation (mm/a)
439.8
409.4
381.2
419.1
349.8
473.9
407.1
Transport amount
Water (10 3
m 3
/a)
2033.0
852.2
836.5
1394.1
2410.4
1084.7
961.5
Soil (10 6
kg/a)
94.4
260.1
312.5
332.8
271.7
300.7
268.4
TN (10 3
kg/a)
29.3
80.9
96.9
103.0
84.1
93.0
83.2
TP (10 3
kg/a)
121.3
333.9
400.7
426.4
347.9
385.7
344.2
SOM (10 3
kg/a)
496.1
1375.0
1650.0
1752.1
1434.1
1576.8
1415.4
Precipitation (mm/a)
439.8
409.4
381.2
419.1
349.8
473.9
407.1
Retention amount
Water (10 3
m 3
/a)
286.7
562.4
543.7
543.7
489.3
658.4
510.5
Soil (10 6
kg/a)
92.2
253.6
304.7
301.8
258.1
297.1
254.4
TN (10 3
kg/a)
28.6
78.8
94.5
93.4
79.9
91.8
78.9
TP (10 3
kg/a)
118.5
325.6
390.6
386.8
330.5
381.0
326.3
SOM (10 3
kg/a)
484.6
1340.7
1608.7
1589.1
1362.4
1557.9
1341.8
Loss amount
Water (10 3
m 3
/a)
1746.4
289.7
292.8
850.4
1921.1
426.3
450.9
Soil (10 6
kg/a)
2.2
6.5
7.8
30.9
13.6
3.6
14.0
TN (10 3
kg/a)
0.7
2.0
2.4
9.6
4.2
1.1
4.3
TP (10 3
kg/a)
2.8
8.3
10.0
39.7
17.4
4.6
17.9
SOM (10 3
kg/a)
11.4
34.4
41.2
162.9
71.7
18.9
73.6
TRE
Water (%)
14.1
66.0
65.0
39.0
20.3
60.7
53.1
Soil (%)
97.7
97.5
97.5
90.7
95.0
98.8
94.8
TN (%)
97.7
97.5
97.5
90.7
95.0
98.8
94.8
TP (%)
97.7
97.5
97.5
90.7
95.0
98.8
94.8
SOM (%)
97.7
97.5
97.5
90.7
95.0
98.8
94.8
Notes
The amount of soil or water retained by each practice taken from Tian et al. (2008)