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The effects of a large species of anecic earthworm, Martiodrilus carimaguensis Jiménez and Moreno, on soil C and N dynamics were investigated in a native savanna and a man-made pasture of the eastern plains of Colombia. We compared, across time (11 months), the total C, total N, NH+ 4 and NO– 3 c...


Decaëns, ThibaudRangel Becerra, AFAsakawa, N.Thomas, Richard J.[Carbon and nitrogen dynamics in ageing earthworm casts in grasslands of the eastern plains of Colombia]Carbon and nitrogen dynamics in ageing earthworm casts in grasslands of the eastern plains of Colombia

The structure and seasonal changes of earthworm communities were evaluated in a natural savanna and in a improved grass-legume pasture in a Colombian oxisol over a period of 18 months. One plot of 90×90 m was isolated in each of the systems and each month five samples of 1 m2×0.5 m and ten of 20×...


Jiménez Jaén, J.J.Moreno, AlonsoDecaëns, ThibaudLavelle, Patrick M.Fisher, Myles J.Thomas, Richard J.[Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia]Earthworm communities in native savannas and man-made pastures of the Eastern Plains of Colombia

This study was carried out in the Eastern Plains of Colombia and assessed the impact of agricultural intensification on the structure of earthworm communities. Earthworms were hand-sorted in a variety of agroecosystems of increasing intensity, from natural savanna to pastures and annual crops. An...


Decaëns, ThibaudJiménez Jaén, J.J.[Earthworm communities under an agricultural intensification gradient in Colombia]Earthworm communities under an agricultural intensification gradient in Colombia

The vertical distribution of native earthworm species from natural and disturbed savannas in the Oxisols of the Colombian Llanos was assessed in a native savanna and in a 17-year-old grazed grass-legume pasture during a period of 17?months. Different patterns of vertical stratification were obser...


Jiménez Jaén, J.J.Decaëns, Thibaud[Vertical distribution of earthworms in grassland soils of the Colombian Llanos]Vertical distribution of earthworms in grassland soils of the Colombian Llanos

The effect of different types of land management on the soil macrofauna of the savanna has been assesed using the T.S.B.F. method. Macrofauna of the forest and savanna has a high density (4293 and 2830 ind.m(2)) and moderate biomass (13.6 and 15.3 g.m(-2)). Traditional grazing significantly incre...


Decaëns, ThibaudLavelle, Patrick M.Jiménez Jaén, J.J.Escobar, G.Rippstein, G[Impact of land management on soil macrofauna in the Oriental Llanos of Colombia]Impact of land management on soil macrofauna in the Oriental Llanos of Colombia

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