Divergent litterfall nutrient responses to rainfall seasonality revealed through long-term observations in a tropical dry forest

IF 1 4区环境科学与生态学 Q4 ECOLOGY

Journal of Tropical Ecology Pub Date : 2023-06-09 DOI:10.1017/S0266467423000159

V. J. Jaramillo, G. Murray-Tortarolo, A. Martínez-Yrizar, M. Maass, J. Sarukhán, M. Nava-Mendoza, Raúl Ahedo-Hernández, Salvador Araiza

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Abstract

Abstract Long-term climate and vegetation data were used to determine the role of rainfall variability and its seasonal distribution on litterfall nutrients. Based on a 20-year data set on rainfall (range 334–1,506 mm per year) and litterfall nutrients from old-growth tropical dry forest (TDF) in Mexico, we examined litterfall N and P concentrations from the rainy and dry seasons in response to rainfall in the rainy (June–October) and the dry (November–May) seasons, the latter referred to as out-of-season precipitation (OSP). Rainy-season litterfall N concentrations, but not P concentrations nor N:P ratios, changed positively (p < 0.001) in response to rainy-season precipitation. Dry-season litterfall N concentrations and N:P ratios, but not litterfall P, increased (p ≤ 0.02) in response to rainfall from the preceding rainy season. N:P ratios of dry-season litterfall in years with OSP were higher only during dry years and N concentrations decreased in wet years (p < 0.05). The narrow range in dry-season litterfall P concentrations (1.00–1.15 mg g-1), irrespective of rainfall amount and OSP, suggests P conservation. The variation in litterfall N, but not litterfall P, in response to rainfall variability reveals a divergent nutrient response along steep changes in water availability in this TDF.

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热带干旱森林长期观测揭示了凋落物养分对降雨季节性的不同响应

摘要利用长期气候和植被资料，研究了降雨变率及其季节分布对凋落物养分的影响。基于墨西哥原生林(TDF) 20年的降雨量(334-1,506 mm /年)和凋落物养分数据集，研究了雨季和旱季凋落物N和P浓度对雨季(6 - 10月)和旱季(11 - 5月)降雨的响应。雨季凋落物N含量随降水呈显著正变化(P < 0.001)，但P含量和N:P比值无显著正变化。旱季凋落物N浓度和N:P比随前雨季降水的增加而增加(P≤0.02)，但凋落物P没有增加(P≤0.02)。枯水期枯落物N:P比值仅在枯水期高，在丰水期低(P < 0.05)。旱季凋落物P浓度(1.00 ~ 1.15 mg g-1)变化范围窄，与降雨量和OSP无关，表明P有保护作用。凋落物N(而非凋落物P)对降雨变率的响应表明，在该TDF中，随着水分有效性的急剧变化，养分响应存在差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Tropical Ecology 环境科学-生态学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： Journal of Tropical Ecology aims to address topics of general relevance and significance to tropical ecology. This includes sub-disciplines of ecology, such as conservation biology, evolutionary ecology, marine ecology, microbial ecology, molecular ecology, quantitative ecology, etc. Studies in the field of tropical medicine, specifically where it involves ecological surroundings (e.g., zoonotic or vector-borne disease ecology), are also suitable. We also welcome methods papers, provided that the techniques are well-described and are of broad general utility. Please keep in mind that studies focused on specific geographic regions or on particular taxa will be better suited to more specialist journals. In order to help the editors make their decision, in your cover letter please address the specific hypothesis your study addresses, and how the results will interest the broad field of tropical ecology. While we will consider purely descriptive studies of outstanding general interest, the case for them should be made in the cover letter.