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DAY 2 Enabling Effective Response
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Adaptation to climate change in Vietnam
Dr. Dave A. D‘haeze
Belo Horizonte, September 11th 2013
Climate Change Predictions
Vietnam • Temperature increase: +0.8 - 2.7°C by 2060 and +1.4 - 4.2°C by 2090
• Rainfall increase: +33% by 2090 in Aug., Sep. & Oct.
• Extreme rainfall events increase: +2 to 14% by 2090 from May to Oct.
• Rainfall decrease in the dry season: - 62% in February, March and April
• Annual river flows: increase in the North; decrease in the South
Central Highlands • Days above 25°C increase: 79 in the base year 94 in 2020, 134 in 2050
and 230 in 2100
• Evapotranspiration increase: +8.5% (1,726mm) between 2040 and 2059; +14.47% (1,821mm) between 2080 and 2099
• Groundwater level decrease: after 2020 due to overexploitation and the decrease in groundwater recharge
2
Land Suitability Predictions - Current
Land Suitability Predictions - 2020
Optimum producing zone will increase by 2050 to altitude 600 -1000m asl (currently 300 - 900m asl)
Land Suitability Predictions - 2050
• Rising temperatures and higer maximum temperatures
Flower abortion
Higher evapotranspiration rate and
irrigation demand
• Irregular and heavy and intermittent rains
Several poor flowerings and poor fruit set
Increased erosion
Rainfall during harvesting, difficult coffee drying, lower coffee quality
• Irregular dry periods
Drought stress required
Not too long
• Falling ground water levels
Vulnerability of Coffee Production
• (no regret) measures (short-term)
Ground cover
More efficient irrigation
Zero-tillage
• Experiment with (mid-term)
Drip irrigation
Crop diversification and shade trees
Application of Hydro-polymers
Centralized drying
• Collect more data (long-term)
Metereological
Groundwater levels
Pests (cicadas)
Adaptation Priorities Identified
• Irrigation is critical to make coffee farming an economically viable livelihood activity
Dak Lak province : 40% national coffee production
Excessive irrigation
Irrigation costs 15-20% of the total production costs (labor, energy & equipment)
57% of irrigation water is groundwater; 95% for coffee
Current irrigation is exploiting up to 71% of the total water resources
Water Footprint – Case Study
.
.
Gia Lai
Dak Lak
Son La
Quang Tri
Ha Noi
Lam Dong
Ho Chi Minh
• Irrigation application
Water Management – Case Study
462
132
40 67 -
100
200
300
400
Average yield Optimized yield
Irrigation (mm/ha) Production (60 kg bag/ha)
1,400 liter / tree / round
400 liter / tree / round
• Water Footprint
Global average: 21,000 liter/kg
Vietnam: circa 5,500 liter/kg
Water Management – Case Study
3.970
2.382
404
283
1.150
690
-
1.000
2.000
3.000
4.000
5.000
6.000
Average yield Optimized yield
lite
r/kg
Green WFP Blue WFP Grey WFP
1 Cup of Coffee
Vietnam: 46 liter of water
Potential: 32 liter of water
Global: 130 liter of water
Potential water saving: 30 %
Water Management – Case Study
Feel free to Visit Vietnam [email protected] www.coffeeandclimate.org