ABSTRACT The intensive cattle production on the Colombian Atlantic coast causes soil degradation and low productivity on pastures. Silvopastoral systems in Colombia are based on introduced species due to a lack of native species knowledge and a cultural trend to overestimate introduced species. It is necessary to study native species in association with the established pastures to increase productivity and to improve soil properties. This research was based on the Sinú River Valley (18 masl), under Tropical dry forest, in Colombia. The aim of this study was to determine changes in nutrient cycling when native trees are incorporated into grassland systems, according to their diversity. Leaf litter decomposition of two grass species and seven forestry native species were evaluated on four experimental blocks. The results showed that residual dry matter decreased over time and facilitated nutrient release associated with species diversity and its interaction. Nutrient liberation was specie-dependent being markedly higher on G. ulmifolia and P. quinata. The concentration of N/P, P, and Mg was significant and had the highest correlation with leaf litter decomposition. The tested decomposition models showed good performance and small significant differences between them, which confirms its reliability to use them under Colombian tropical conditions.

中文翻译：

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新热带环境下不同林牧系统的凋落物分解

摘要 哥伦比亚大西洋沿岸的集约化养牛业导致土壤退化和牧场生产力低下。由于缺乏本地物种知识和高估引进物种的文化趋势，哥伦比亚的林牧系统以引进物种为基础。有必要研究与已建牧场相关的本地物种，以提高生产力和改善土壤特性。该研究基于哥伦比亚热带干旱森林下的 Sinú 河流域 (18 masl)。本研究的目的是确定当本地树木被纳入草地系统时，根据它们的多样性，养分循环的变化。在四个实验块上评估了两种草种和七种林业本地物种的落叶分解。结果表明，残余干物质随着时间的推移而减少，并促进了与物种多样性及其相互作用相关的养分释放。养分释放是物种依赖性的，在 G. ulmifolia 和 P. quinata 上显着更高。N/P、P 和 Mg 的浓度显着，与凋落物分解的相关性最高。经测试的分解模型表现出良好的性能，它们之间的显着差异很小，这证实了其在哥伦比亚热带条件下使用它们的可靠性。Mg 显着，与凋落物分解的相关性最高。经测试的分解模型表现出良好的性能，它们之间的显着差异很小，这证实了其在哥伦比亚热带条件下使用它们的可靠性。Mg 显着，与凋落物分解的相关性最高。经测试的分解模型表现出良好的性能，它们之间的显着差异很小，这证实了其在哥伦比亚热带条件下使用它们的可靠性。