Hans van der Wal

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Regrowth of tropical secondary forests following complete or nearly complete removal of forest vegetation actively stores carbon in aboveground biomass, partially counterbalancing carbon emissions from deforestation, forest degradation, burning of fossil fuels, and other anthropogenic sources. We estimate the age and spatial extent of lowland second-growth(More)
Land-use change occurs nowhere more rapidly than in the tropics, where the imbalance between deforestation and forest regrowth has large consequences for the global carbon cycle. However, considerable uncertainty remains about the rate of biomass recovery in secondary forests, and how these rates are influenced by climate, landscape, and prior land use.(More)
Dairy herd health and production management programmes are used by veterinary practices as a daily routine. However, the potential of this increasingly important source of income is probably not realized completely. The activities of dairy herd health and production management programmes were assessed by both veterinarians and dairy farmers. Subsequently,(More)
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