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Bamboo, its filter effect in different agroforestry systems and its role in the household economy in Northern Vietnam

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Bamboo species, Acacia. Mangium and Tephrosia candida are common woody species in South-East Asian countries including Vietnam. Various types of bamboo and other woody species and crops have been included in different agroforestry systems. In this study one bamboo species (Bambusa blumeana), Acacia mangium and Tephrosia candida were chosen as test species for simulating and comparing filter effects of different agroforestry systems with intercropping, hedgerows or fallow rotation. This was done to investigate whether agroforestry systems with bamboo species constitute a sustainable land use option for the Dong Cao catchment and similar areas in Northern Vietnam. The PaLA method and some PRAIRRA tools such as the village model, village sketch, transect, timeline, water flow sketch and semi-structured interviews were used to gather information relevant for this study. The computer model WaNuLCAS was used to study agroforestry systems for sustainable land use in the Dong Cao catchment, situated 60 kilometers south west of Hanoi, Vietnam. During the first part of the study, information concerning bamboo species was gathered. Semi-structured interviews were conducted about land use, the use of bamboo species, and the role of bamboo in the household economy. Field measurements were performed to obtain above- and below-ground growth parameters as well as soil physical parameters, which were necessary for the modeling work. The parameters of bamboo were adjusted to give reasonable model outputs compared to observed growth and biomass values. Gathered site specific input data such as soil physical properties and tree and crop species parameters were partly compiled from research conducted by the LUSLOF team in 2002, and partly from further field research conducted in 2003. Site-specific simulations were performed in order to obtain model outputs from different cropping systems on water balance and water runoff, which were further interpreted in terms of erosion. Tre gai (Bambusa blumeana) was the most common bamboo species It accounted for 56% of the total number of bamboo clumps. Bamboo accounted for a higher percentage of the income than did trees in the total household economy. It made up 7-14% of the income compared to 1-10% from trees. According to the model simulations, the investigated agroforestry systems reduced the the water run-off (erosion) in the following order: BambooTaungya AcaciaTaungya; Bamboo Hedgerow ~ Acacia Hedgerow> Tephrosia Hedgerow; Bamboo Hedgerow >Tephrosia Fallow Therefore, there should be a lower erosion from bamboo systems compared to similar agroforestry systems with Acacia mangium or Tephrosia candida
    Publication year

    2004

    Authors

    Nguyen L

    Language

    English

    Keywords

    herbaceous plants, nutrients, vegetative propagation

    Geographic

    Viet Nam

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