PHYSICAL PROPERTIES OF PEAT SOIL IN RAPP RELATED TO wt
-
Upload
dedi-kusnadi-kalsim -
Category
Documents
-
view
369 -
download
3
Transcript of PHYSICAL PROPERTIES OF PEAT SOIL IN RAPP RELATED TO wt
PHYSICAL PROPERTIES OF PEAT SOIL IN RAPP RELATED TO
WATER TABLE DEPTH
D.K. KALSIM
11 May 2015
1 DEDI K. KALSIM
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
0
10
20
30
40
50
60
70
80
90
100
0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100
BD
(g/
cc)
Tota
l Po
re (
%)
Soil depth (cm)
BD vs Total Pore of HST peat (Typic Haplo-Saprist)
Total Pore (%) BD (g/cc)
BD-TOTAL PORE
2 DEDI K. KALSIM
PEAT BD-SOIL DEPTH
3
0.13 0.05
0.21 0.19
DEDI K. KALSIM
Retention curve (pF-%v)
0
10
20
30
40
50
60
70
80
Soil
Mo
istu
re (
% v
/v)
Soil Depth (cm)
pF1 pF2.54 pF4.2
4 DEDI K. KALSIM
WT=100 CM – DRY SEASON
y = -0.0021x3 + 0.3517x2 - 22.427x + 462.52 R² = 0.872
-120
-100
-80
-60
-40
-20
0
30 35 40 45 50 55 60 65 70 75
Soil
de
pth
(cm
)
Soil moisture (% vol)
Soil moisture profile WT=100 cm, I 062-PES, March 2014
57%
5 DEDI K. KALSIM
CONCLUSION
• AT DRY SEASON WT=100 CM, SM AT SOIL SURFACE 38%vol (WP=30%, FC=42%)
• WHAT HAPPENED IF WT=40 CM?
– SM AT SOIL SURFACE 57% vol (FC=42%, SAT=60%)
– ONLY 3% AIR AVAILABLE- not enough?? –opt 20%
– RETARDED GROWTH – WORSE IN WET SEASON??
6 DEDI K. KALSIM
Acacia crassicarpa
Age : 36 months old
Height: 21 m
DBH : 14 cm
(Diameter Breast height)
Roots depth : 96 cm
Water Table level: 110 cm
Acacia crassicarpa root growth depth
in relation to peat water table level
7 DEDI K. KALSIM
Acacia crassicarpa
Age : 36 months old
Height: 17 m
DBH : 10 cm
(Diameter Breast height)
Roots depth : 40 cm, roots
tends to grow above water
table
Acacia crassicarpa poorer growth and DBH in areas where
peat water table fluctuates between high and medium level
Water Table 45 cm
8 DEDI K. KALSIM
Acacia crassicarpa plantation 36 months
Tree Toppling / Leaning is an issue in peat areas
9 DEDI K. KALSIM
MVOL - PEAT DEPTH
10
0
20
40
60
80
100
120
140
160
Mvo
l (m
3/h
a)
Peat Thickness
Peat Thickness vs Mvol at 4 - 5 Years ACRA at Sapric Peat Type in Pelalawan Sector at Rotation 2
n = 69
>3m
<3m
STATISTICALLY NOT
SIGNIFICANT DIFFERENCE
DEDI K. KALSIM
TAMBAHAN 25 May 2015
DEDI K. KALSIM 11
From Wetlands International 2013
12 DEDI K. KALSIM
Peatland is Economical Sustainable – Actual growth data for Acacia Plantations in Pelalwan by Rotation – MAI is increasing
Pelalawan Estate B
13 DEDI K. KALSIM
Effect of water table & bulk density to soil C flux
Melling (2015) 14 DEDI K. KALSIM
15 DEDI K. KALSIM
Effect of Water Table on Acacia crassicarpa growth
• Peat Drum Study:
– Treatments: Water Table 20, 40, 60, 80cm
– Location : R&D Nursery
– Objective : to determine root behaviour in a controlled water table
• Results 6 months after planting:
– No significant difference in term of height growth
– Root depth is significantly affected by water table
– Root depth followed the water table; Root did not grow into the water
– Lower water table has higher root depth: shoot height ratio than high water table
16 DEDI K. KALSIM
20cm 80cm
17 DEDI K. KALSIM
PEAT DRUM STUDY
Higher RD:SH ratio implies a better tree stability (more balanced biomass distribution)
Water
Table
(cm)
Root
Depth
(cm)
Shoot
Height
(cm)
RD:SH
Ratio
20 21.3 123 0.17
40 39.8 136 0.29
60 60.0 112 0.54
80 78.6 133 0.59
18 DEDI K. KALSIM
Soil Compaction (PT Pulau Sambu, Guntung Riau)
DEDI K. KALSIM 19