Yliopiston etusivulle Suomeksi På svenska In English Helsingin yliopisto

Productive coexistence and gain in agroforestry systems.

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dc.contributor.author Huang, Wending
dc.date.accessioned 2011-07-28T13:45:53Z
dc.date.available 2011-07-28T13:45:53Z
dc.date.issued 1998
dc.identifier.citation Acta Forestalia Fennica. 1998. 260: 1-72. fi
dc.identifier.issn 0001-5636
dc.identifier.uri http://hdl.handle.net/10138/27298
dc.description.abstract Productive coexistence and coexistence gain of populations were studied using nine years' data from field experiments of Taxodium ascendens-intercrop systems in Lixiahe, Jiangsu Province, China. A theoretical framework for productive coexistence in agroforestry was developed. Interaction patterns between trees and intercrops were presented within this framework. A model framework was developed to describe the coexistence gain and interaction of populations in T. ascendens-intercrop systems. Facilitation and resource sharing were identified as main contribution to the advantage of species combination in agroforestry. The model of population interaction developed in the present study was accepted for describing the interaction of populations in T. ascendens-intercrop systems, because it explained a high proportion of the variance of experimental data and fitted well the observations in most intercropping types. The model developed in the present study provides flexibility for describing different patterns of intra- and inter-specific interactions. Model coefficients were applied to the determination of the ecological compatibility of species. Managed T. ascendens-intercrop systems were advantageous as compared to a monoculture of trees or arable crops. In T. ascendens stands up to the age of three, arable crops contributed about 50-80 % of the total biomass yield of agroforestry. The diameter or height growth of T. ascendens was not significantly influenced by intercrops, indicating that intercropping under trees produced extra yields but did not depress the tree growth. When the trees were young (during the first three years), T. ascendens did not depress the crop yields, and a land equivalent ratio greater than unity was obtained together with a high yield of both components. The diameter and height of the trees were similar in four spacing configurations with an equal number of trees per hectare up to the age of eight, but wider between-rows open range were beneficial for the intercrops. The relationship between open-ranges and species coexistence was also analysed and the distribution of soil nutrients studied. fi
dc.language.iso en fi
dc.publisher The Society of Forestry in Finland - The Finnish Forest Research Institute fi
dc.subject vuorovaikutus fi
dc.subject tuottavuus fi
dc.subject agroforestry fi
dc.subject Taxodium ascendens fi
dc.subject agroforestry, coexistence gain, facilitation, interaction model, productive coexistence, resource sharing, Taxodium ascendens fi
dc.title Productive coexistence and gain in agroforestry systems. fi
dc.type Artikkeli fi
dc.identifier.laitoskoodi SMS fi
dc.subject.ysa Aasia fi
dc.subject.ysa Kiina fi

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