BRS Seminar 23Sept05.ppt -...
Transcript of BRS Seminar 23Sept05.ppt -...
Revegetation StrategiesMatt Colloff
maximising benefits ofrevegetation
~$100m/yr investmentin revegetation
• Increase establishmentsuccess by improvingnodulation with native rhizobia
• Role of soil engineers ininfluencing local andcatchment water balance
• Role of insect herbivory inaltering water uptake by trees
Rhizobial strain0
2
4
6
8
10
12
Pla
nt
we
igh
t(g
ms
)
GoodBad
Revegetation
Irrigation Water SavingsShahbaz Khan
increasing irrigation benefitsand saving water
Efficiencies in Murrumbidgee Irrigation AreaGL 2000/01
Irrigation water(surface)
Irrigationwater
(groundwater)
Rainfall
Regionalgroundwater
1048
439
26
Off-farmconveyance
90%95%
On-farmconveyance
88%90%
Fieldefficiency
89%95%
Edge offarm
836
946
1162Rootzone
Edge offield
Water useefficiency
Waterproductivity
87%91%
798t/GL836
Economicreturn
$198K/GL$207
1419ET
Shallowground-
water118
1,300,241tonnes
$322mprofit
Total watersupply1630
18 Applyingproject results
Current
75 GL saved +$14m profit
EnvironmentalBenefit
Monitoring anddelivery
100 – 200 GL
Closer monitoringand delivery
10 – 50 GL
Piping channels
15 – 70 GL
Reducingevaporation losses
20 – 50 GL
Incentives forefficient water use
10 to 30% increasein water security
Providing ecosystemservices
reduction in rechargeabatement cost
match demand with supply
_ accessions to watertable
Water Savings
production andenvironmental benefits
Incr
easi
ngin
vest
men
t
Sealing leakychannels
_ accessions to watertable_ salinity
promotion of water efficientcommunity
Off-farmMurrumbidgee &ColeamballyIrrigation Areas
On-farmMurrumbidgee &ColeamballyIrrigation Areas
EnvironmentalBenefit
Soil + groundwater monitoring
0.1 to 3 ML/ha
Irrigation flowmonitoring
0.2 to 2.5 ML/ha
Laser levelling0.1 to 0.4 ML/ha
Lining on-farmchannels
1 to 4% of supply
Converting floodto sprinkler
0.1 to 2.2 ML/ha
Converting floodto drip
2.0 to 4.0 ML/ha
_ accessions to watertable
Water Savings
_ subsurface drainage_ surface drainage
Incr
easi
ngin
vest
men
t
$2,0
00 -
$7,0
00 /M
L
_ accessions to watertable_ salinity
Ecological OutcomesRod Oliver
linking water regimes to ecologicaloutcomes along the Murray Valley
The Living Murray
River MurrayFlood Inundation Model
1956 Flood Extent
Adelaide
Melbourne
Canberra
Albury
Barmah ForestFlood Inundation Model
DEM from LIDAR –Barmah Millewa
70 cm inundation
Vegetation1. Species composition
2213231TOTAL
20056Halophyte
66Succulent
1569131Hydrophyte
43838Obligate aquatic
137812256TOTAL
1131169Tree
3844706Shrub
2988488Perennial monocot
1081163Annual monocot
2375300Perennial forb
2363431Annual forb
No. ofrecords
No. ofspecies
Indigenous1850 species
Exotics 406 species (16%)
Rare & threatened 24 species
2. Spatial modelling
+ existing survey data
years
carb
on p
er h
ecta
re
0 60 120 180 240 300
0
1
2
25% conservation (t)50% conservation (t)100% conservation (t)
Vegetation3. Dynamic modelling