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The recovery rates of secondary savannas in abandoned pastures are poorly explained by environmental and landscape factors
Applied Vegetation Science ( IF 2.0 ) Pub Date : 2019-10-19 , DOI: 10.1111/avsc.12457 Mário G.B. Cava 1 , Natashi A.L. Pilon 2 , Camila F. Priante 3 , Milton Cezar Ribeiro 3 , Giselda Durigan 2, 4
Applied Vegetation Science ( IF 2.0 ) Pub Date : 2019-10-19 , DOI: 10.1111/avsc.12457 Mário G.B. Cava 1 , Natashi A.L. Pilon 2 , Camila F. Priante 3 , Milton Cezar Ribeiro 3 , Giselda Durigan 2, 4
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QUESTION: Assessing the natural regeneration potential of degraded savannas is a crucial step in restoration planning, since that assessment will define the need for and costs of active intervention. Predicting natural regeneration, however, depends on the mechanistic understanding of ecosystem resilience. Here, we searched for the factors modulating plant communities spontaneously regenerating in abandoned pastures. LOCATION: Tropical savanna (cerrado), Brazil. METHODS: Over two years, we quantified changes in the structure, richness and species composition of plant communities in 29 secondary savannas resulting from pasture abandonment. We then investigated the influence of soil and landscape attributes, exotic grass cover and time since pasture abandonment on the recovery rate and species composition of these communities. RESULTS: The wide variation among sites was not explained by time since abandonment or distance to the nearest remnant native vegetation. Soil attributes, exotic grasses and native vegetation cover around a pasture explained a small fraction of the variation in the recovery rate. We did not find an isolated factor or a robust set of factors explaining the variation in the recovery rate for all vegetation attributes. Species composition was slightly influenced by exotic grasses, soil penetration resistance, proportion of fine soil particles and time since abandonment. Colonization and resprouting by savanna specialists over the two‐year period were hindered by exotic grasses. CONCLUSION: The use of predictive models based on soil properties, exotic grasses, landscape attributes or time since abandonment is unfeasible for inferring the recovery rate of savanna structure and richness after pasture abandonment. Case‐by‐case monitoring is required to support decisions on restoration intervention. Other factors, which are almost impossible to obtain, such as land‐use practices and history and the taxonomic or functional composition of pre‐existing vegetation, can potentially influence the recovery rate. Exotic grasses must be controlled to favour colonization and resprouting by savanna specialists.
中文翻译：
废弃牧场中次生稀树草原的恢复率很难用环境和景观因素来解释
问题：评估退化稀树草原的自然再生潜力是恢复规划的关键步骤，因为该评估将确定积极干预的需求和成本。然而，预测自然再生取决于对生态系统恢复力的机制理解。在这里，我们寻找调节废弃牧场中植物群落自发再生的因素。位置：热带稀树草原（塞拉多），巴西。方法：两年多来，我们量化了 29 个次生稀树草原因牧场遗弃而导致的植物群落结构、丰富度和物种组成的变化。然后，我们调查了土壤和景观属性、外来草覆盖和自牧场废弃以来的时间对这些群落恢复率和物种组成的影响。结果：地点之间的巨大差异并不能用自废弃以来的时间或与最近的残余原生植被的距离来解释。土壤属性、外来草和牧场周围的原生植被覆盖解释了恢复率变化的一小部分。我们没有找到一个孤立的因素或一组强大的因素来解释所有植被属性的恢复率的变化。物种组成受外来草、土壤渗透阻力、细土颗粒比例和废弃时间的影响较小。稀树草原专家在两年期间的殖民和重新发芽受到外来草的阻碍。结论：使用基于土壤特性、外来草、荒地后的景观属性或时间对于推断牧场荒废后稀树草原结构和丰富度的恢复率是不可行的。需要逐案监测以支持恢复干预的决策。其他几乎不可能获得的因素，例如土地利用实践和历史以及现有植被的分类或功能组成，可能会影响恢复率。稀树草原专家必须控制外来草以利于殖民和重新发芽。可能会影响回收率。稀树草原专家必须控制外来草以利于殖民和重新发芽。可能会影响回收率。稀树草原专家必须控制外来草以利于殖民和重新发芽。
更新日期：2019-10-19
中文翻译：
废弃牧场中次生稀树草原的恢复率很难用环境和景观因素来解释
问题：评估退化稀树草原的自然再生潜力是恢复规划的关键步骤，因为该评估将确定积极干预的需求和成本。然而，预测自然再生取决于对生态系统恢复力的机制理解。在这里，我们寻找调节废弃牧场中植物群落自发再生的因素。位置：热带稀树草原（塞拉多），巴西。方法：两年多来，我们量化了 29 个次生稀树草原因牧场遗弃而导致的植物群落结构、丰富度和物种组成的变化。然后，我们调查了土壤和景观属性、外来草覆盖和自牧场废弃以来的时间对这些群落恢复率和物种组成的影响。结果：地点之间的巨大差异并不能用自废弃以来的时间或与最近的残余原生植被的距离来解释。土壤属性、外来草和牧场周围的原生植被覆盖解释了恢复率变化的一小部分。我们没有找到一个孤立的因素或一组强大的因素来解释所有植被属性的恢复率的变化。物种组成受外来草、土壤渗透阻力、细土颗粒比例和废弃时间的影响较小。稀树草原专家在两年期间的殖民和重新发芽受到外来草的阻碍。结论：使用基于土壤特性、外来草、荒地后的景观属性或时间对于推断牧场荒废后稀树草原结构和丰富度的恢复率是不可行的。需要逐案监测以支持恢复干预的决策。其他几乎不可能获得的因素，例如土地利用实践和历史以及现有植被的分类或功能组成，可能会影响恢复率。稀树草原专家必须控制外来草以利于殖民和重新发芽。可能会影响回收率。稀树草原专家必须控制外来草以利于殖民和重新发芽。可能会影响回收率。稀树草原专家必须控制外来草以利于殖民和重新发芽。
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