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Climate change and food production: Pakistan. M. Arif Goheer Global Change Impact Studies Centre (GCISC) Islamabad – Pakistan GECAFS IGP CPW&F and APN Launch Workshops Kathmandu-Nepal, June 27-30, 2006. Climate Change

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climate change and food production pakistan

Climate change and food production: Pakistan

M. Arif Goheer

Global Change Impact Studies Centre (GCISC)

Islamabad – Pakistan

GECAFS IGP CPW&F and APN Launch Workshops

Kathmandu-Nepal, June 27-30, 2006

slide2
Climate Change

“the greatest challenge facing the world at the beginning of the century”

World Economic Forum Davos, Switzerland 2000

changing climatic trends
Changing Climatic Trends
  • Increasing concentration of CO2 in the atmosphere
      • Pre-industrial revolution (1789) 280 ppm
      • Present (2004) 380 ppm
      • Expected level (2050) 550 ppm
  • Rising surface temperatures
      • Global Av. Temp. rise (20th century) 0.6 °C
      • Projections for 2100 1.4 to 5.8 °C
  • Changing rainfall patterns

Source: IPCC, 2001

slide4

Depending on the level of GHG emissions and concentration in the atmosphere, the average global temperature would rise between 1.4 oC – 5.8 oC over the 21st Century

climate and food production
Climate and Food Production
  • Weather and Climate are the key factors in food productivity
  • Being open to vagaries of nature, food production are highly vulnerable

to climate change phenomena

climate related parameters of agricultural productivity
Climate Related Parameters of Agricultural Productivity
  • CO2
  • Temperature
  • Solar Radiation
  • Precipitation
  • Others (Wind speed and direction, Soil Moisture, Water vapour, etc.)

Basic understanding of these factors helps manipulate plants to meet human needs of food, fiber and shelter

The parameters also help understand impacts of climate change and devise adaptation/mitigation strategies

slide7

Climate-Water-Food Linkages

Photosynthetic

Activity

Evapo-transpiration (ET)

Crop Water Demand

Canal/ground

water

Water Availability

Agriculture (Crop Yield)

GDD

and Corresponding GSL

projections of ipcc for south asia
Projections of IPCC for South Asia
  • Increase in surface temperature will contribute to snowmelt resulting in risk of floods
  • Indus river inflows will decrease by 27% by the year 2050
  • Land degradation will cause land to shrink from present 0.8 ha per capita to 0.3 by 2010
  • Areas in mid and high latitudes will experience increase in crop yield whereas in lower latitudes will experience a general decrease, under elevated CO2 conditions

IPCC, 2001

slide9

Semi-arid areas

  • Crop models showed that increase in temperature of 0.9 and 1.8°C resulted in reduction in length of wheat growing season by 4 and 8 days respectively
  • At 0.9°C increase in temperature, wheat grain yield increased by 2.5% whereas at 1.8°C increase, the grain yield decreased by 4%
  • The increase in temp. would reduce the productivity of rice crop due to heat stress and reduction in growing season length
slide10

Arid areas

  • Crop modeling studies showed a non significant trend in wheat yields under increased temperature scenarios (0.9°C and 1.8°C)
  • Wheat straw yields were reduced by 7% and 12% with temperature increases of 0.9°C by 2020 and 1.8°C by 2050
impacts on food production
Impacts on Food Production

Due to Increasing Temperatures

  • Shift in spatial crop boundaries will have enormous economic and social impact.

e.g. Rice transplantation, Cotton picking etc.

  • Increase/decrease in crop yields
  • Rise in evapotranspiration rates, calling for greater efficiency of water use
  • Shift in timing of developmental stages of pests in Crop-weed-pest relationships
slide12

Due to Change in Precipitation Pattern

  • More dependency on ground water in the face of low precipitation
    • danger of depletion of aquifer due to injudicious pumping
    • increased cost of cultivation
    • soil salinization due to poor quality ground water
effect of water supplies
Effect of water supplies
  • Decreased Surface Water Supplies
  • Reduction in yield and quality of crops due to water stress during critical growth stages
  • Shift in cropping patterns
  • Nitrogen volatilization losses from ammonical fertilizers
slide14
b) Increased Water Supplies
  • Potential development of Water logging and Salinity/Sodicity
  • Denitrification losses from ammonical and nitrate based fertilizers
  • Shift in cropping patterns
  • Increased incidence of plant diseases
slide15
Extreme Weather Events
  • In addition to changing climate, increased variability in weather may occur with consequent frequent extreme events such as heat waves, droughts, wind storms and floods having negative impacts on agriculture
pakistan s resource base
Pakistan’s Resource Base

LAND (in million hectare)

  • Geographical area = 79.6
  • Area under cultivation = 27.6% (21.87)
  • Crop area irrigated = 22.6% (17.99)
  • Rainfed Agriculture area = 4.97% (21.87)
  • Forest = 4.5% (3.61)
  • Culturable waste = 11.7% (9.31)
  • Range Lands = 59% (46.96)
cropping seasons
Cropping Seasons
  • Rabi
    • November-April
      • Wheat, Lentil, Chickpea
  • Kharif
    • May-October
      • Rice, Maize, Mungbean, Cotton
agricultural productivity
Agricultural productivity

Agricultural Statistics of Pakistan 2001-02

demand and production projections with respect to climate change in pakistan
Demand and Production projections with respect to climate change in Pakistan

* Million Bales

Source: CICERO 2000:2

slide21
Wheat & Rice Simulation Results

using DSSAT based CERES-Wheat & CERES-Rice models

Semi-arid areas

Arid areas

Humid area

Sub-humid areas

slide25
Effect of Increase in Temperature on Wheat GSL(DSSAT based results 1994-95 to 2003-04 for Cv. Inqalab sown on Nov. 20th)
effect of increase in temperature and co 2 levels on rice yields in semi arid areas of punjab
Effect of Increase in Temperature and CO2levelson Rice yields in Semi-arid areas of Punjab

Baseline Yield

slide27

Effect of increase in Temperature on GSL of Rice in Semi arid areas of Punjab (Faisalabad)(Cv. Basmati Super transplanted in 1st Week of July)

conclusions
Conclusions
  • Rise in CO2 level only has positive impact on wheat yield
  • Rise in Temperature shows negative impact on wheat yield
    • But it could be mitigated if CO2 level = 550 ppm
  • Negative impact of Rise in Temperature on yield could also be mitigated by increasing number of Irrigations (but…)
  • Reduction in water resources shows a negative impact on wheat yield
  • Even 550 ppm CO2 level would not result in sustaining current yield level if water resources reduce
  • Rise in CO2 levels could sustain the baseline Rice yields up to 1C