brs seminar 23sept05.ppt -...
TRANSCRIPT
![Page 1: BRS Seminar 23Sept05.ppt - data.daff.gov.audata.daff.gov.au/brs/data/warehouse/brsShop/data/brs_seminar_23s… · BRS Seminar 23Sept05.ppt.pdf Created Date: 11/15/2005 1:37:08 PM](https://reader033.vdocuments.site/reader033/viewer/2022051605/60164bbc8db68f1b1b108f35/html5/thumbnails/1.jpg)
Revegetation StrategiesMatt Colloff
maximising benefits ofrevegetation
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~$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
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Rhizobial strain0
2
4
6
8
10
12
Pla
nt
we
igh
t(g
ms
)
GoodBad
Revegetation
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Irrigation Water SavingsShahbaz Khan
increasing irrigation benefitsand saving water
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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
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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
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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
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Ecological OutcomesRod Oliver
linking water regimes to ecologicaloutcomes along the Murray Valley
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The Living Murray
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River MurrayFlood Inundation Model
1956 Flood Extent
Adelaide
Melbourne
Canberra
Albury
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Barmah ForestFlood Inundation Model
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DEM from LIDAR –Barmah Millewa
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70 cm inundation
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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
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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