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- W2523699416 abstract "For centuries, land degradation triggered by deforestation has occurred in Ethiopia, in particular in the northern regional state Tigray, the area under study. In order to change this situation, the local government started to establish enclosures. In these sites, grazing is no longer permitted so that forest can naturally regenerate. In order to develop sustainable yield planning for forest rehabilitation areas in Tigray, one needs to know the effect of closing areas on biomass accumulation. In an enclosure, aboveground dry weight of herbaceous and woody species was estimated at 1,84 ton/ha. A combination of destructive and non-destructive methods was tested. The non-destructive study was rejected because of a non-accurate wood density estimation, and low correlation coefficients for the weight predicting models. Best fit-least square regression models were developed using diameter at 30 cm height as the independent variables and dry weight as the dependent variable. Coefficients of determination for the selected total biomass models of the destructive study ranged from 0,67 up to 0,99, whereas they ranged from 0,20 to 0,90 for the woody species in the non-destructive study. Equations for foliage biomass generally had lower coefficients of determination than the equations for either stem or total biomass of the woody species. Non woody biomass was measured in different enclosures in order to estimate the biomass production in function of the management technique. 98% of the total herbaceous biomass of the sampled grass plots belonged to Hypperrhenia hirta, while in the grazing land nearby it was only 11%. The correlation coefficient between grass biomass and basal area of the woody vegetation was -0,11. Based on this study this enclosure is not adopted for fuelwood collection." @default.
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- W2523699416 date "2004-01-01" @default.
- W2523699416 modified "2023-09-27" @default.
- W2523699416 title "Biomass estimation techniques for enclosures in a semi-arid area: a case study in Northern Ethiopia" @default.
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