the soil water debate i know i do not know. soil pedology effect of increasing rainfall on a soil...
TRANSCRIPT
The Soil Water Debate
I Know I Do Not Know
Soil Pedology
Effect of increasing rainfall on a soil sequence in NSW (From Koppi 1990).
Rainfall Characteristics North Ryde Jun 07 – Feb 08
26/0
6/20
07
10/0
7/20
07
24/0
7/20
07
7/08
/200
7
21/0
8/20
07
4/09
/200
7
18/0
9/20
07
2/10
/200
7
16/1
0/20
07
30/1
0/20
07
13/1
1/20
07
27/1
1/20
07
11/1
2/20
07
25/1
2/20
07
8/01
/200
8
22/0
1/20
08
5/02
/200
8
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
pH
pH
pH uS/m Rainfall (mm)
Average 5.5 78.1 12.7
Average Dev 0.6 85.8 8.8
Median 5.5 20.0 8.0
Min 3.0 0.0 2.0
Max 7.9 1371.0 51.0
Count 85.0 85.0 67.0
Matrix Potential vs Moisture Content for Two Soils ( From Hanks 1992 Pg 45
Table 2.5 )
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
0.03
0.05
0.08
0.12
0.16 0.
2
0.24
Volumetric Moisture
Mat
rix
Po
ten
tial
SharpyLoam (m)
Geary SiltLoam (m)
Soil Physics
Soil Water Hysteresis
Conceptual and Parametric Representation of Soil Hydraulic Properties: A Review. Shmuel Assouline * and Dani Or. VZJ Vol. 12 No. 4
g Gravimetric MoistureMass H O Loss g
Mass Oven Dry Soil g( . )
. ( )
. . . .. 2
Soil Moisture Calculation
g g. 1
Moisture Content
Camden Camden Boree Boree
Desc Measure Soil 1 Soil 1 Soil 2 Soil 2
Moisture Content
( Thea G ) 0.18 0.18 0.09 0.07
Bulk Density g cm 1.39 1.3 1.34 1.19
g g. 1
SOIL CHEMISTRY
Electrical Conductivity
Method Of Measurement – or What are we Measuring
ECe EC 1:5 ECw EC app EC1:1 EC 1:2
Soil Chemistry
Osmotic potential-0.36* (mmho/cm) (Osmotic potential) bar
Range 3-30mmhos
Total Cations or Anions from ECTotal Cations or Anions (mEq/l) 10*EC(mmho/cm)
Total Dissolved Salts (mg\l)from ECTDS(mg/l) 0.64 *EC(mmho/cm)
Formula for EC to Osmotic pressure, Total Cations and TDS. From Bresler, et al 1982
Other Debate POINTS
Thank you