Nitrogen dynamics in small watersheds in the Atlantic Forest and Cerrado in Northeastern Brazil

Pub Date : 2022-09-30 DOI:10.22571/2526-4338620

Jessica Carneiro Souza, Bianca Souza Cana Verde, H. C. R. S. Brandão, D. Silva

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Abstract

The aim of this study was to determine concentrations of nitrogen (N) in two biomes, Atlantic Forest (AF) and Cerrado (CR), at the interface between terrestrial and aquatic ecosystems. This involved evaluating N in vegetation (litterfall), soil and water in small watersheds in environmental protection areas in northeastern Brazil. Soil chemical and physical analyzes were performed and mineralization and nitrification rates were determined. The forms of organic, inorganic and particulate nitrogen in water were determined by spectrophotometry. Two collections were carried out, one in the dry season (October and November 2019) and another in the rainy season (February and March 2020), in two environmental preservation areas, Estação Veracel Private Natural Heritage Reserve - (Atlantic Forest) and Chapada Diamantina National Park (Cerrado), with five small watersheds sampled in each biome. The N concentration in litterfall was similar in both biomes, with averages of 0.69%. In relation to soil and water, N concentrations were higher in AF compared to CR, with concentrations of 0.95 ± 0.40 and 0.59 ± 0.14 µg.Ng-1 of nitrate in the soils of AF and CR, respectively, and 3.53 ± 2.51 µM of nitrate in water in AF and 0.76 ± 0.78 µM in CR.

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巴西东北部大西洋森林和塞拉多小流域的氮动力学

本研究的目的是确定陆地和水生生态系统交界处大西洋森林（AF）和塞拉多（CR）两个生物群落中的氮浓度。这包括评估巴西东北部环境保护区小流域的植被（落叶）、土壤和水中的氮。进行了土壤化学和物理分析，并测定了矿化率和硝化率。采用分光光度法测定了水中有机氮、无机氮和颗粒氮的形态。在Estação Veracel私人自然遗产保护区（大西洋森林）和Chapada Diamantina国家公园（塞拉多）这两个环境保护区进行了两次采集，一次在旱季（2019年10月和11月），另一次在雨季（2020年2月和3月），每个生物群落采样了五个小流域。两个生物群落中凋落物中的氮浓度相似，平均为0.69%。就土壤和水而言，AF中的氮含量高于CR，AF和CR土壤中的硝酸盐浓度分别为0.95±0.40和0.59±0.14µg.Ng-1，AF和CR土壤中的水硝酸盐浓度为3.53±2.51µM和0.76±0.78µM。

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