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Our Vision: Landscapes for People, Food and Nature
1. Our Vision:
Landscapes for People,
Food and Nature
Kwesi Atta-Krah, Bioversity International
Atta-Krah,
Sara J. Scherr, EcoAgriculture Partners
Scherr,
Tony Simons, World Agroforestry Centre
49. 250 Ring w idth 150
Rain season prec.
Rainy season prec. (mm)
200 130
Ring width index
150 110
100 90
50 70
0 50
1937
1942
1947
1952
1957
1962
1967
1972
1977
1982
1987
1992
1997
2002
Empirical data: research by Aster Year Three ‘drought’ indicators:
Three ‘drought’ indicators:
Gebrekirstos c.s. showed intra- Ringwidth
Ringwidth
annual variation in O16/O18 ratio in C12/C13 /C13 carbon isotope ratio
C12carbon isotope ratiops
growth indicative of stomatal closure
indicative of stomatal closure
rings in the Sa- O16/O18 /O18 oxygen isotope rati
O16 oxygen isotope ratios
hel, indicative indicative of stomatal closure +
indicative of stomatal closure
of ‘short cycle’ ocean/terrestrial origin of rainfall
ocean/terrestrial origin of rain
rain in 2nd part of
of growing season