Where does the forest come back from? Soil and litter seed banks and the juvenile bank as sources of vegetation resilience in a semiarid Neotropical forest
Where does the forest come back from? Soil and litter seed banks and the juvenile bank as sources of vegetation resilience in a semiarid Neotropical forest
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DOI：
10.1111/jvs.12842
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发表时间：
2020-02
影响因子：
2.8
通讯作者：
M. L. Lipoma;V. Fortunato;Lucas Enrico;S. Díaz
中科院分区：
文献类型：
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作者：
M. L. Lipoma;V. Fortunato;Lucas Enrico;S. Díaz
问题：水库的存在是生态系统恢复力的一个关键因素，在干扰后，优势植物从中进行补充。考虑到这一点，我们提出以下问题：在半干旱的新热带查科森林中，木本物种从哪里再生？土地利用是否影响生物多样性水库的植物区系组成？土壤和凋落物种子库和幼生种子库是否是这些森林在不同土地利用制度下恢复力的潜在来源？地点：阿根廷科尔多瓦西北部的钱卡尼。方法：我们选择了四种长期土地利用强度不断增加的生态系统类型：原始森林（过去50年没有土地利用），次生林（低土地利用强度），封闭的物种丰富的灌木丛（中等土地利用强度）和开放的灌木丛（高土地利用强度）。我们监测了四个网站，每个生态系统类型，我们记录成人，树苗和所有木本物种的幼苗。我们收集了凋落物和土壤样品，在实验室进行分类鉴定和种子发芽。我们比较了土壤和枯落物银行，以及青少年银行（“生物多样性水库”）的植物区系组成的建立植被的原始森林，被认为是参考生态系统。结果：木本植物在土壤中几乎不存在，但在不同生态系统类型的枯枝落叶层和幼河岸中均有很好的代表性。这两个水库表现出很高的相似性，已建立的植被的原始森林。然而，随着土地利用强度的增加，水库和已建立的植被的原始forest.Conclusions：凋落物和幼林银行，而不是土壤银行，是主要的水库招募新个体的木本物种在查科森林。然而，随着土地使用的加剧，这些水库作为恢复力来源的能力下降。
Questions:The existence of reservoirs from which dominant plants recruit after disturbances is a key factor in ecosystem resilience. With this in mind, we ask the following qestion: where do woody species regenerate from in the semiarid Neotropical Chaco forest? Is land use affecting the floristic composition of biodiversity reservoirs? Are the soil and litter seed banks and the juvenile bank potential sources of resilience of these forests in the face of different land‐use regimes?Location:Chancaní, Northwestern Córdoba, Argentina.Methods:We selected four ecosystem types subjected to increasing long‐term land‐use intensity: primary forest (no land use in the last 50 years), secondary forest (low land‐use intensity), closed species‐rich shrubland (moderate land‐use intensity), and open shrubland (high land‐use intensity). We monitored four sites per ecosystem type where we recorded adults, saplings and seedlings of all woody species. We collected litter and soil samples that were processed in the laboratory for taxonomic identification and germination of seeds. We compared the floristic composition of the soil and litter banks, as well as of the juvenile bank (“biodiversity reservoirs”) with that of established vegetation of the primary forest, considered as the reference ecosystem. We also compared the established vegetation from sites under land use with that of the primary forest.Results:Woody species were scarcely represented in the soil, but very well represented in the litter and the juvenile banks from different ecosystem types. These two reservoirs showed high similarity with the established vegetation of the primary forest. However, as land‐use intensity increased, similarity between the reservoirs and the established vegetation of the primary forest decreased.Conclusion:Litter and juvenile banks, but not the soil bank, are the main reservoirs for the recruitment of new individuals of woody species in the Chaco forest. However, the ability of these reservoirs to act as sources of resilience decreases as land use intensifies.