Ecophysiological and Seasonal Responses of Fabaceae Tree Species in Amazonian Reforestation: Gas Exchange, Nutrient, and Carbohydrate Data
Description
This dataset accompanies the study by Roberto Kirmayr Jaquetti, Josiane Celerino de Carvalho, Karen Cristina Pires da Costa, Adamir da Rocha Nina Junior, Jair Max Furtunato Maia, George Louis Vourlitis, Gustavo Habermann, and José Francisco de Carvalho Gonçalves, which investigates how fertilized and unfertilized Fabaceae tree species respond to water shortage in Amazonian reforestation efforts. The dataset includes measurements of gas exchange (photosynthesis, stomatal conductance and transpiration), leaf area, macro- and micronutrient concentrations (P, K, Ca, Fe, Zn), and non-structural carbohydrates (soluble sugars and starch) for six Fabaceae species under drought and wet conditions, with both fertilized and unfertilized treatments. Data were collected over a 25-month period in a degraded Amazonian area, enabling analysis of physiological and biochemical responses to environmental and nutritional scenarios. This resource supports restoration strategies and policy decisions for tropical forest management, and is intended for researchers studying plant ecophysiology, forest restoration, and tropical ecosystem resilience.
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Steps to reproduce
The experiment was conducted in a 3-hectare degraded area in Presidente Figueiredo, Amazonas, Brazil, characterized by low-nutrient Oxisol soil. Six Fabaceae tree species (three non-N-fixers and three N-fixers) were selected and planted in February 2015 using a 3 × 3 m spacing scheme. A total of 432 seedlings were divided into fertilized and unfertilized groups. Fertilized plants received pit fertilization with organic fertilizer, NPK, limestone, and micronutrients, followed by annual amendments. N-fixing species were inoculated with Rhizobium strains. Plants were monitored over a 25-month period, covering both drought and wet seasons. Measurements included gas exchange parameters (photosynthesis, stomatal conductance, transpiration), leaf area, nutrient concentrations (P, K, Ca, Fe, Zn), and non-structural carbohydrates (soluble sugars, starch). Leaf samples were collected at specified times, dried, and ground for nutrient and carbohydrate analyses using spectrophotometry and colorimetry. Data were analyzed using two-way ANOVA to assess the effects of seasonality, fertilization, and their interactions, with Tukey’s post-hoc test applied for group comparisons.
Institutions
- Instituto Nacional de Pesquisas da Amazonia