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journal of renewable natural resources bhutan - Ministry of Agriculture

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M. R. Moktan et alinfrastructures comprised RNR (Renewable Natural Resource)extension centre, two rural clinics, one basic health unit, primaryschool and irrigation channel and ten rural water and sanitationschemes.Land use type constitutes wetland (12 ha) dry land (88 ha) tseri (760ha), mixed agriculture partly wetland and dry land (738 ha ) <strong>natural</strong>pastures (454 ha) and forest types; broadleaf (16,960 ha) broadleafwith conifers (59ha) and scrub forest (11 ha) (MoA, 2002). Othersinclude; rocky outcrops (149 ha) water spreads (312 ha) andsettlements (7 ha). Economy is subsistence-oriented and depends onagriculture and livestock.Bjoka receives a total rainfall <strong>of</strong> 1503 mm/yr with a highest <strong>of</strong> 442mmin July and lowest <strong>of</strong> 10mm in January (Fig.1). The rainfall distributionpattern is skewed with most rainfalls occurring between the summermonths <strong>of</strong> April to September crucial for new growth and regeneration<strong>of</strong> vegetation including bamboo and canes.500Rainfall in mm4003002001000Jan Feb Mar Apr May June July Aug Sept Oct Nov DecFigure 1:Annual rainfall in BjokaBjoka falls in the warm broadleaf vegetation zone ( Table 1) and it ischaracterised by dominance <strong>of</strong> principal tree species such as Altingiaexcelsa, Betula alnoides , Castanopsis indica, Engelhardtia spicata,Maesia spp, Ostodes paniculata and Macaranga pustulata. Variousbamboo and cane species abound the forests along the moist shadycreeks and streams.41

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