ANALYSIS OF THE HORIZONTAL STRUCTURE OF THE YOUNG REGENERANT BANK IN A DEGRADED RIVERSIDE ECOSYSTEM IN THE SEMIARID OF PARAIBA

Q4 Environmental Science

Floresta Pub Date : 2023-03-31 DOI:10.5380/rf.v53i2.84299

Geneilson Evangelista da Silva, Francisca Maria Sousa Barbosa, Alecksandra Vieira de Lacerda

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Abstract

The objective was to evaluate the structure of the young regenerating stratum in a degraded riverside area of caatinga in the Serra Branca-PB, the semiarid region of Paraíba. Two inventories were performed, one in the dry season (September/2019) and the other in the rainy season (March/2020). In the riparian area, 50 contiguous plots of 10 X 20 m were allocated. In the center of each plot, subplots of 1 X 1 m were plotted, totaling 50 m2, for the evaluation of the regenerating stratum. The density, frequency, dominance, and importance value parameters were calculated. The heterogeneity of the floristic community was determined by the Shannon diversity index (H') and Pielou's evenness index (J'). In both inventories, 39 species distributed in 31 genera and 14 families were recorded. In the dry period, the species with the highest importance value were respectively Alternanthera tenella Colla, Sida galheirensis Ulbr. and Fabaceae 1. Related to the rainy season, the species with the highest importance value were Urochloa decumbens (Stapf), R.D.Webster, Blainvillea acmella (L.), Philipson, and Boerhavia diffusa L. The diversity and evenness values were 1.22 nats.ind.-1 and 0.49 (dry season) and 2.59 nats.ind.-1 and 0.71 (rainy season), respectively. The results obtained in the two inventories were similar to other studies in these same conditions of degraded caatinga. The study also demonstrated that this area is in an initial stage of ecological succession, with a predominance of exotic species in both inventories (dry and rainy).

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帕拉伊坝半干旱区退化河岸生态系统中新生代河岸的水平结构分析

目的是评估帕拉伊巴半干旱地区Serra Branca PB中caatinga退化河岸地区年轻再生层的结构。进行了两次库存，一次在旱季（2019年9月），另一次在雨季（2020年3月）。在河岸区域，分配了50块10 X 20 m的连续地块。在每个地块的中心，绘制了1 X 1 m的子地块，总计50 m2，用于评估再生层。计算了密度、频率、优势度和重要性值参数。区系群落的异质性由Shannon多样性指数（H’）和Pielou均匀度指数（J’）决定。在这两份名录中，共记录了分布在14科31属的39种。在干旱期，重要值最高的物种分别是Alternathera tenella Colla、Sida galheirensis Ulbr。和Fabaceae 1。与雨季相关，具有最高重要性值的物种是伞形花（Stapf）、R.D.Webster、Blainvillea acmela（L.）、Philipson和Boerhavia diffusa L.。多样性和均匀度值分别为1.22 nats.ind.-1和0.49（旱季）和2.59 nats.ind.1-1和0.71（雨季）。在这两份清单中获得的结果与在这些相同条件下对退化的卡廷加进行的其他研究相似。研究还表明，该地区正处于生态演替的初始阶段，外来物种在两种名录中都占主导地位（干旱和多雨）。

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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.