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Comparative Study of Water Quality Across Different Seasons in the Gregório River Watershed, São Paulo, Brazil 巴西圣保罗格雷戈里奥河流域不同季节水质对比研究

Advances in Forestry Science Pub Date : 2024-07-02 DOI: 10.34062/afs.v11i2.15691

Danielly De Oliveira Fornaziero, João Ânderson Fulan, Jhony Vendruscolo

{"title":"Comparative Study of Water Quality Across Different Seasons in the Gregório River Watershed, São Paulo, Brazil","authors":"Danielly De Oliveira Fornaziero, João Ânderson Fulan, Jhony Vendruscolo","doi":"10.34062/afs.v11i2.15691","DOIUrl":"https://doi.org/10.34062/afs.v11i2.15691","url":null,"abstract":"The goal of this study was to monitor the water quality in the Gregório river, São Carlos, São Paulo during the dry and rainy seasons using traditional methods such as physical and chemical analysis of the water and biological indicators. Six sampling points were monitored, ranging from the nearest location to the source of the river to its confluence with the Monjolinho river. Physical and chemical parameters of water (water surface temperature, dissolved oxygen, pH, and conductivity) were measured using a multiparameter probe. The distance between the points was determined according to the access to the site: from P1 to P2 (1328 m), from P2 to P3 (1278 m), from P3 to P4 (201 m), from P4 to P5 (820 m), and finally from P5 to P6 (1814 m). The biotic index used in conjunction with the environmental variables was the Biological Monitoring Working Party (BMWP), a qualitative index that utilizes benthic macroinvertebrates to classify water quality. Ceratopogonidae, Chironomidae, Chironomus, Enchytraeidae, Hirudinea, and Naididae were recorded at sites P1, P2, and P6 during both the dry and rainy seasons. This study, particularly at P6, it was observed that despite the higher concentration of dissolved oxygen compared to the other analyzed sites, which would indicate good water quality, the BMWP indicated that the location had a strongly polluted water quality, suggesting that environmental factors must be associated with biological indicators. It was concluded that the use of biological indicators along with environmental data provided a more reliable understanding of water quality.","PeriodicalId":476331,"journal":{"name":"Advances in Forestry Science","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Yield and economic feasibility of Eucalyptus dunnii stands under different management regimes 不同管理制度下桉树林的产量和经济可行性

Advances in Forestry Science Pub Date : 2024-07-02 DOI: 10.34062/afs.v11i2.14896

Luis Gustavo Fillus, Isabel Homczinski, Andrea Nogueira Dias, R. Miranda, Gabriel de Magalhães Miranda, R. H. Roque, R. C. Mayrinck, X. M. D. Oliveira

{"title":"Yield and economic feasibility of Eucalyptus dunnii stands under different management regimes","authors":"Luis Gustavo Fillus, Isabel Homczinski, Andrea Nogueira Dias, R. Miranda, Gabriel de Magalhães Miranda, R. H. Roque, R. C. Mayrinck, X. M. D. Oliveira","doi":"10.34062/afs.v11i2.14896","DOIUrl":"https://doi.org/10.34062/afs.v11i2.14896","url":null,"abstract":"The aim of this study was to analyze volume yield, number of logs per assortment and economic feasibility of Eucalyptus dunnii stands under different management regimes. The stands are located in Fernandes Pinheiro, Paraná State, Brazil and cover a total area of 2.26 hectares, fragmented into three strata (treatments): A (8 years after coppicing regime), B (9-year old stand after two thinnings), and C (7-year old stand after one thinning). Diameters at breast height (d) of all trees and heights of 110 trees were obtained. The total height of the other trees was estimated by a hypsometric relationship. Tree volume was obtained through a taper function. For the economic analysis comparing the three strata, the periodic equivalent value (PEV) and the internal return rate (IRR) were evaluated considering an interest rate of 8%. The commercial volumetric estimates ranged from 156.61 to 375.53 m³ ha⁻¹. The stratum A yielded more logs, mostly for energy; stratum B yielded larger logs, and stratum C yielded similar number and volume of logs from all assortment classes. For economic analysis, PEV ranged from R$ 196.16 to R$ 1,255.79 ha year⁻¹, and IRR ranged from 12.73% per year (stratum A) to 21.35% per year (stratum C), based on a interest rate of 8%. It was concluded that the management condition of stratum C resulted in higher economic returns, with its product primarily destined for Sawmill 1.","PeriodicalId":476331,"journal":{"name":"Advances in Forestry Science","volume":"31 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141685300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimativa do incremento diamétrico anual em remanescente natural de Floresta Ombrofila Mista 估算混交双子叶林自然保护区的年径向增量

Advances in Forestry Science Pub Date : 2024-07-02 DOI: 10.34062/afs.v11i2.16013

G. Orso, João Paulo Sardo Madi, Alexandre Behling, Allan Libanio Pelissari, Afonso Figueiredo Filho, Sebastião Do Amaral Machado

{"title":"Estimativa do incremento diamétrico anual em remanescente natural de Floresta Ombrofila Mista","authors":"G. Orso, João Paulo Sardo Madi, Alexandre Behling, Allan Libanio Pelissari, Afonso Figueiredo Filho, Sebastião Do Amaral Machado","doi":"10.34062/afs.v11i2.16013","DOIUrl":"https://doi.org/10.34062/afs.v11i2.16013","url":null,"abstract":"O incremento diamétrico é uma variável de complexa estimativa em florestas naturais, especialmente dada a composição de espécies e o lento crescimento das árvores. Para essas situações, algumas pesquisas têm voltado sua atenção ao emprego de modelos de crescimento de árvores individuais, aliando com estratégias de agrupamento de indivíduos ou espécies, em que o objeto de estudo é o próprio indivíduo arbóreo. Este trabalho teve como objetivo estimar o incremento diamétrico de árvores em um remanescente natural de Floresta Ombrófila Mista, visando investigar metodologias de formação de grupos de indivíduos que favoreçam a estimativa do incremento diamétrico individual. Os grupos foram formados a partir de uma metodologia em dois estágios, a primeira via diâmetro padronizado e a segunda via uma razão. relacionando diâmetro relativo, incremento diamétrico e índices de competição. O incremento diamétrico foi estimado a partir de um estimador de razão utilizado de forma a conciliar a estratégia de agrupamento. O agrupamento classificou de forma satisfatória os indivíduos, em que os índices de competição foram relevantes para essa classificação. O uso do diâmetro padronizado (dp) foi oportuno para uma melhor separação dos indivíduos. O erro de estimativa do incremento diamétrico foi de 0,0599 cm.ano-1 para os dados de treino e 0,0765 cm.ano-1 para os dados de validação. A estimativa do diâmetro futuro teve um erro médio de 4,52%. A combinação da dupla estratificação com o estimador de razão foi satisfatória para estimativa precisa dos incrementos diamétricos de todas as espécies arbóreas.","PeriodicalId":476331,"journal":{"name":"Advances in Forestry Science","volume":"21 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141685160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0