哥伦比亚安第斯山脉中部低阶峡谷中常见的三种先锋树种叶片分解的外在和内在控制

IF 0.9 Q4 ECOLOGY Neotropical Biodiversity Pub Date : 2021-01-01 DOI:10.1080/23766808.2021.1964913
L. P. Giraldo, J. F. Blanco-Libreros, J. Chará
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引用次数: 0

摘要

河岸林为热带水源提供了大量的凋落叶(1-3级),其分解受叶片质量和大型无脊椎动物活动的相互作用控制。然而,在北安第斯山脉的溪流中进行的研究很少。在哥伦比亚咖啡生态区内,利用三种原生树种(Heliocarpus americanus、Nectandra sp.和Cecropia telealba)在两条水源中进行了凋落叶分解实验。测试了内在因素(质量)和外在因素(有无大型无脊椎动物)对分解率的交互作用。在粗孔网眼袋和细孔网眼袋中分别培养三种单种处理、一种混合处理和一种人工基质处理,以允许或排除大型无脊椎动物定植。研究开始后7、14、28和56天将袋子从溪流中取出。测定了各树种衰老叶片的韧性和化学品质,以考察其对分解速率的影响。单种处理和混合处理的k值表明,分解速率为中~快(0.009 ~ 0.01 d−1)。叶片韧性与碳氮比(C: N)和碳磷比(C: P)呈显著正相关,与分解率呈显著负相关。在凋落叶袋中发现了来自13目35科47属的3876只个体。蠓科、蚓科和水蠓科为丰度最高的科。凋落叶袋中大型无脊椎动物的丰度和丰富度与内在特征描述符(叶质量)没有相关性。这些结果表明,在研究的3种树种中,衰老叶片的内在特征决定了它们的质量损失率,而大型无脊椎动物的丰度或丰富度起次要作用,可能是由于碎纸机并不丰富。
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Controles extrínsecos e intrínsecos en la descomposición de hojas de tres especies de árboles pioneros comunes en quebradas de bajo orden en los Andes Centrales de Colombia
ABSTRACT Riparian forests provide high amounts of leaf litter to tropical headwater streams (1–3 order) and its decomposition is controlled by interactions between leaf quality and macroinvertebrate activity. However, few studies have been conducted in North Andean streams. We conducted a leaf litter decomposition experiment using three native tree species (Heliocarpus americanus, Nectandra sp., and Cecropia telealba) in two headwater streams in the Colombian Coffee-growing Eco-Region. The interactive roles of intrinsic factors (quality) and extrinsic factors (presence/absence of macroinvertebrates) on decomposition rates were tested. Three single-species treatments, a species-mixture treatment, and an artificial substrate treatment were incubated in either coarse-pore mesh or fine-pore mesh bags to allow or exclude macroinvertebrate colonization, respectively. Bags were removed from the streams 7, 14, 28 and 56 days after starting the study. Toughness and chemical quality of senescent leaves of each species were determined in order to test their effect on the decomposition rates. The k-values for the three single-species and the species-mixture treatments indicated that decomposition occurred at medium to fast rates (0.009–0.01 day−1). H. americanus showed the greatest mass loss at the end of the trial, followed by C. telealba and Nectandra sp. Leaf toughness was positively correlated with carbon-to-nitrogen ratio (C: N) and carbon-to-phosphorus ratio (C: P) and, in turn, the three characteristics were negatively correlated with breakdown rate. A total of 3876 individuals from 13 orders, 35 families, and 47 genera colonized leaf-litter bags. Chironomidae, Lumbriculidae, and Hydropsychidae were the families with the highest abundance. The abundance and richness of macroinvertebrates in the leaf-litter bags showed no correlation with the descriptors of intrinsic characteristics (leaf quality). These results indicate that among the three tree-species in the study, the intrinsic characteristics of senescent leaves determine their mass loss rates, while the macroinvertebrate abundance or richness play a secondary role, probably due to the fact that shredders were not abundant.
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来源期刊
Neotropical Biodiversity
Neotropical Biodiversity Environmental Science-Ecology
CiteScore
1.80
自引率
0.00%
发文量
39
审稿时长
24 weeks
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