Author:
Weber John C.,Montes Carmen Sotelo,Ugarte Julio,Simons Tony
Abstract
Abstract
A low-intensity selection strategy was recommended for timber trees in the Peruvian Amazon to maintain genetic variation on farms and produce modest gains in tree growth. The effectiveness of this strategy was evaluated using Calycophyllum spruceanum. Farmers selected 66 mother trees of different ages on farms in seven locations (~20% of all trees in the locations) in one watershed, based on a visual assessment of growth, form and external disease symptoms. Another 66 mother trees were chosen at random. Tree height, stem diameter, stem bifurcations and mortality of progeny of the selected and random groups of mother trees were evaluated at 15, 26 and 38 months in a provenance/progeny test located on farms in the same watershed. Height was significantly greater (10%) in the selected group at 15 months, but it did not differ significantly between the selected and random groups at 26 and 38 months. There were no significant differences in diameter, bifurcations and mortality between the groups. There was significant variation in height and diameter at all measurement ages due to families, and results suggested that variation in bifurcations and mortality due to families was also significant. Based on approximate 95% confidence
intervals, family variances in height and diameter did not differ significantly between the selected and random groups at any measurement age, but evaluations should continue to confirm these tentative conclusions. Some practical implications for tree improvement programs are discussed.
Reference29 articles.
1. BOIVIN-CHABOT, S., H. A. MARGOLIS and J. C. WEBER (2004): Variation in coppice-shoot growth among provenances of Calycophyllum spruceanum Benth. in the Peruvian Amazon Basin. Forest Ecology and Management 198: 249-260.
2. BRODIE, A. W., R. A. LABARTA CHÁVARRI and J. C. WEBER (1997): Tree germplasm management and use on-farm in the Peruvian Amazon: a case study from the Ucayali region, Peru. Research report, Overseas Development Institute, London, and International Centre for Research in Agroforestry, Nairobi.
3. CONY, M. A. (1996): Genetic variability in Prosopis flexuosa D.C., a native tree of the Monte phytogeographic province, Argentina. Forest Ecology and Management 87: 41-49. 10.1016/S0378-1127(96)03839-X
4. CORNELIUS, J. (1994): The effectiveness of plus-tree selection for yield. Forest Ecology and Management 67: 23-34. 10.1016/0378-1127(94)90004-3
5. CORNELIUS, J., F. MESÉN, E. COREA and M. HENSON (1996): Variation in growth and form of Alnus acuminata Kunth. grown in Costa Rica. Silvae Genetica 45: 24-30.
Cited by
14 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献