Litter and fine-root production in three types of tropical premontane rain forest in SE Venezuela
作者： Jörg Priess , Christiane Then , Horst Fölster
关键词: Oxisol 、 Plant ecology 、 Environmental science 、 Agronomy 、 Old-growth forest 、 Agroforestry 、 Rootstock 、 Nutrient 、 Rainforest 、 Litter 、 Productivity (ecology)
摘要: We investigated the productivity of three premontane primary forest sites in an extremely nutrient-poor environment on Guyana shield SE Venezuela. Aboveground litter production (total 5.58; leaves 4.30 Mg ha−1 year−1) was low, but comparable to other tropical forests. Due low nutrient status, net fine roots among highest ever reported (11.14 Mg ha−1 year−1). Only 20% root stock alive, 80% consisted necromass. Similar values were obtained for dead and living tips. Element concentrations (including bio- necromass), especially Ca, whereas Al relatively high. The upper limit average lifetime 253 days. conclude that high proportion necromass mainly caused by slow mineralisation roots.
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