Changes of<Emphasis Type="Italic"> Sorghum bicolor</Emphasis> landrace diversity and farmers’ selection criteria over space and time,Ethiopia |
| |
Authors: | Awegechew Teshome Daniel Patterson Zemede Asfew J Kenneth Torrance John T Arnason |
| |
Institution: | (1) Geography and Environmental Studies, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada , K1S 5B6;(2) Biology Department, University of Ottawa, 30 Marie Curie Street, Ottawa, ON, Canada, K1N 6N5;(3) Biology Department, Addis Ababa University, P.O. Box 1196, Addis Ababa, Ethiophia |
| |
Abstract: | Temporal and spatial changes of sorghum landrace diversity and related factors in five farming communities in north Shewa
and south Welo, between 1992/1993 and 2000/2001, were studied in order to ascertain the stability of a range of factors that
support the maintenance of the crop genetic diversity. The same farmers were interviewed and the same sorghum fields were
surveyed both times. Over the 8-year period: the total area planted to sorghum decreased drastically in all five farming communities
and a large percentage of the farmers in the communities (Hayk, 69%; Borkena, 68%; Epheson, 51%; Merewa Adere, 72%; and Bati,
54%) decreased the field size planted to sorghum, because of population growth, land redistribution policy, seasonal changes,
and stagger cropping followed by interspecies crop displacement; landrace richness increased significantly in Merewa and Borkena,
but decreased significantly in Bati, Epheson and Hayk; and farmers’ selection criteria, the reasons for growing specific landraces,
increased significantly (10 in 1992/1993 vs. 22 in 2000/2001). Significant differences in field size distribution occur among
the five farming communities. In 2000/2001, 22 “generalist” landraces (grown widely across three or more communities), and
46 “specialist” landraces (niche specific, restricted to certain microhabitats in one or two communities) were found. Landrace
gains and losses from the farms surveyed in individual communities over the period are demonstrated. |
| |
Keywords: | Landraces Diversity Landrace richness Sorghum Spatio-temporal dynamics Farmers’ selection criteria Ethiopia |
本文献已被 SpringerLink 等数据库收录! |
|