BIOMASS AND NUTRIENTS IN THE FOREST-FLOOR LITTER OF SECOND-GROWTH BRAZILIAN ATLANTIC FORESTS

Q4 Environmental Science

Floresta Pub Date : 2023-01-18 DOI:10.5380/rf.v53i1.85457

R. Marques, J. G. Larsen, Anadia Cattarin, Fabiana De Medeiros Silveira

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Abstract

This study aimed to evaluate the biomass and chemical composition of the forest floor litter in three remnants of Submontane Dense Ombrophilous Forest located in the Guaricica Natural Reserve in the municipality of Antonina, state of Paraná, Brazil. The areas selected for this study are at different stages of secondary succession, here named initial stage (INI), intermediate stage (INT), and advanced stage (ADV). The litter was collected in different seasons of the year (summer and winter of 2013 and 2014) and sorted into fractions: whole leaves (WL), leaves under some stage of decomposition (DL), miscellaneous litter (ML), and branches (B). After sorting, the litter was oven-dried, weighed, and had the contents of C, N, P, K, Ca, and Mg measured. After that, the accumulated amount of each nutrient in the different litter fractions was estimated. Accumulation of biomass in the INI was lower than that in the ADV. The DL fraction showed the highest level of biomass accumulation among all fractions. The average concentration of macronutrients in the litter showed the following sequence: C>N>Ca>Mg>K>P. The C/N ratio was higher in the INI and INT compared with that in the ADV. Higher levels of macronutrients were frequently observed in the ADV. Inputs of C and of most nutrients increased from the INI to the ADV, except for Ca, whose input varied little throughout the different successional stages.

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巴西大西洋次生林林底凋落物的生物量和养分

本研究旨在评价巴西帕拉南州Antonina市瓜里西卡自然保护区3个亚山地茂密菊苣林遗址的森林凋落物的生物量和化学组成。本研究选取的区域处于次生演替的不同阶段，分别为初始阶段(initial stage, INI)、中期阶段(intermediate stage, INT)和晚期阶段(advanced stage, ADV)。在不同季节(2013年和2014年夏、冬)收集凋落物，将凋落物分为全叶(WL)、某阶段分解叶(DL)、杂凋落物(ML)和树枝(B)。分选后，将凋落物烘干、称重，并测定C、N、P、K、Ca、Mg的含量。然后，估算不同凋落物组分中各养分的累积量。群落生物量积累量低于群落生物量积累量，群落生物量积累量以群落生物量积累量最高。凋落物中常量营养素的平均浓度顺序为:C>N>Ca>Mg>K>P。不同演替阶段，除了Ca的输入变化不大外，INI和INT的C/N比均高于ADV。在ADV中经常观察到较高的常量营养素水平。从INI到ADV, C和大多数营养素的输入都增加了。

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

Floresta Environmental Science-Nature and Landscape Conservation

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： Revista Floresta admits articles of scientific contribution in Forest Science, in the areas of Nature Conservation, Economy and Forest Policy, Forest Management, Silviculture and Wood Technology. The main task is to promote and divulgate the development of Forest Science in Brazil and in the world. Articles published in Revista Floresta are under total responsibility of the authors, who are aware that they are original studies. It remains implicit that articles were not submitted for publication to any other divulgation media. It remains explicit the agreement of authors to norms of the journal and, along the development of their work, the observance of ethic aspects and respect of the current copyright legislation.