IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012979

Giovanna Carla Teixeira, D. Gonçalves, Ana Cláudia de Barros Modesto, D. Souza, D. Carvalho, T. A. Magalhães, L. S. D. Oliveira, G. L. Teixeira, G. E. Brondani

引用次数: 4

An innovative approach on the renewable hybrid barrier: combined use of wood and sand 可再生混合屏障的创新方法:木材和沙子的结合使用

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012821

H. I. Yumrutas, Emre Birinci, H. Yörür, A. Atahan

{"title":"An innovative approach on the renewable hybrid barrier: combined use of wood and sand","authors":"H. I. Yumrutas, Emre Birinci, H. Yörür, A. Atahan","doi":"10.1590/01047760202127012821","DOIUrl":"https://doi.org/10.1590/01047760202127012821","url":null,"abstract":"Background: Wooden materials have been among the basic materials used in many different areas due to some advantages throughout the history. Roadside barriers, which are called passive safety structures, can be produced with different materials such as wood, steel, concrete, and plastic. In this study, Renewable Hybrid Barriers (RHB), a new type of barrier that is used wood in terms of aesthetics, renewability, high shock resistance, and used sand in terms of impact absorption capacity and low cost, produced by taking into account some of the disadvantages of other barrier types. These barriers are planned to be used especially in historical/touristic areas, scenic roads, and in urban areas as urban furniture. Real-time crash tests in accordance with EN 1317 (Road Restraint Systems) standard require high cost and long time. Therefore, the pendulum crash test mechanism frequently used in the literature was manufactured at which the experiments were carried out. Results: The results revealed that the RHBs which has 2 cm thick timber and sand used together, were sufficient and suitable in terms of both cost and necessary safety criteria. It was observed that impregnation and heat treatment applications did not have a considerable negative effect on the performance of RHBs which provide an opportunity to use RHBs for outdoor conditions.. Conclusion: In the light of the results of the study, the optimum wood timber thickness was determined as 2 cm regarding TB 31 test criteria. It is proposed that the crash tests for different wood species, timber thickness, and/or barrier dimensions should carry out in future studies. This study can serve as the basis for the next step, real-time real crash tests. Since the study includes an interdisciplinary subject, it is thought that it will inspire different studies.","PeriodicalId":50705,"journal":{"name":"Cerne","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67153805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Study on rare and endangered plants under climate: maxent modeling for identifying hot spots in northwest China 西北地区气候条件下珍稀濒危植物研究——基于热点地区识别的植被模型

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012667

Hua Zhang, Haoxiang Zhao

{"title":"Study on rare and endangered plants under climate: maxent modeling for identifying hot spots in northwest China","authors":"Hua Zhang, Haoxiang Zhao","doi":"10.1590/01047760202127012667","DOIUrl":"https://doi.org/10.1590/01047760202127012667","url":null,"abstract":"Background: Climate warming has caused substantial changes in temporal and spatial environmental patterns. The study on hot spots of rare and endangered plants in Northwest China under predicted climate change can provide a scientific reference for the restoration and reconstruction of those degraded habitats, as well as the improvement of the protection system in Northwest China. Results: Based on MaxEnt algorithm, 813 effective distribution records and 11 environmental factor variables of rare and endangered plants in Northwest China, this study identified the changes of biodiversity hotspots of rare and endangered plants in Northwest China under predicted climate change. The results showed that: (1) the prediction accuracy of MaxEnt model is high, the area under the curve (AUC) is 0.876, and the total suitable area for potential geographical distribution of rare and endangered plants in Northwest China is 137.96×104km 2 , mainly including Western and Southwestern Xinjiang, Southern Gansu, parts of Eastern and Southern Qinghai Province, and Southern Shaanxi Province; (2) altitude, temperature and precipitation are the main environmental factors affecting the hot spots of rare and endangered plants in Northwest China; (3) under four climate change scenarios in the future, with the increase of emission scenarios from low to high forcing, Xinjiang would have the most obvious loss of hot spots of rare and endangered plants in Northwest China, and the most obvious increase of which would occur in Qinghai and Gansu provinces. Conclusion: Under the climate change scenario in the future, with the emission scenario increasing from low forcing to high forcing, the most obvious loss of the hot spots of rare and endangered plants in Northwest China happens in Xinjiang Province, and that of the most obvious increase occurs in Qinghai and Gansu provinces.","PeriodicalId":50705,"journal":{"name":"Cerne","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67154030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Restoration potential of eight tree species from a seasonally dry tropical forest in southeast Piauí, Brazil 巴西东南部季节性干燥热带森林8种树种的恢复潜力Piauí

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012702

A. Ribeiro, A. C. Ferraz Filho, S. G. G. Farias, B. A. S. Dias, Helionai Pereira da Silva

引用次数: 2

Technical feasibility of Eremanthus erythropappus (dc.) macleish coppice: critical factor for sustainable management 红胡杨(dc.)的技术可行性:可持续管理的关键因素

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012954

A. Pavan, S. Botelho, L. A. Melo, Vanete Maria de Melo Pavan, M. Terra

引用次数: 0

Ratios between aboveground net primary production, litterfall and carbon stocks in scots pine stands (Russia) 苏格兰松林分地上净初级生产量、凋落物和碳储量之比(俄罗斯)

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012567

A. Osipov, Ivan N. Kutjavin, K. Bobkova

{"title":"Ratios between aboveground net primary production, litterfall and carbon stocks in scots pine stands (Russia)","authors":"A. Osipov, Ivan N. Kutjavin, K. Bobkova","doi":"10.1590/01047760202127012567","DOIUrl":"https://doi.org/10.1590/01047760202127012567","url":null,"abstract":"Background: Forests are the main terrestrial regulators of greenhouse gas concentrations. However, estimates of carbon fluxes in them are characterized by large uncertainties. Therefore, the derivation of predictors for their assessment is an urgent task. The aim was to assess the carbon stocks in the biomass to characterize the intensity of aboveground net production and the amount of litterfall in Scots pine forests of different types on the North-East of the Europe. We estimated biomass and aboveground net primary production (ANPP) of stands using sample trees. For vegetation of ground cover biomass and primary production evaluating, we cut off all aboveground organs on an area of 625 cm 2 and removed the first-year parts. Litterfall was collected over 3–6 years using litter traps. Results: Most of the carbon in the biomass of pine forests is concentrated in trees (C stand ) with dominating role of stem wood. However, in boggy forests, ground vegetation plays a significant role in carbon stocks, both in absolute and relative values. We estimated carbon fluxes in ANPP and stand litterfall. High contribution of needles was detected for these flows. The ratio between ANPP and C stand varied from 0.018 to 0.056 but between Litterfal and C stand ranged from 0.008 to 0.024. Conclusion: The biomass, ANPP and litterfall depended form forest type. Obtained ratios between them can be used for assessing carbon fluxes in large regions using remote data collection of forest biomass.","PeriodicalId":50705,"journal":{"name":"Cerne","volume":"26 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67154176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Segmented taper models form for Manchurian fir and Korean spruce in northeastern China 在中国东北形成了满洲冷杉和朝鲜云杉的分段锥形模型

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012659

Amna Hussain, M. K. Shahzad, Lichun Jiang, Fengri Li

引用次数: 0

Canopy recovery four years after logging: a management study in a southern brazilian secondary forest 采伐四年后的冠层恢复:巴西南部次生林的管理研究

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012366

Janine Kervald Likoski, A. Vibrans, D. Silva, A. Fantini

{"title":"Canopy recovery four years after logging: a management study in a southern brazilian secondary forest","authors":"Janine Kervald Likoski, A. Vibrans, D. Silva, A. Fantini","doi":"10.1590/01047760202127012366","DOIUrl":"https://doi.org/10.1590/01047760202127012366","url":null,"abstract":"Background : Understanding forest dynamics after logging is essential to define forest management cycles and intensities. In secondary forest, especially in the Atlantic Forest Domain, these studies are still scarce. Monitoring of the canopy structure after tree harvesting can be performed by hemispherical photographs, where canopy opening is commonly analyzed. This study evaluated changes in canopy opening four years after tree harvesting in a secondary Atlantic Rainforest in southern Brazil. We used hemispherical photographs to determine the Canopy Openness (CO), Leaf Area Index (LAI), and Diffuse Fraction of Photosynthetically Active Absorbed Radiation (FAPAR dif ) in eleven permanent plots. Results: We found that harvesting resulted in a momentary increase in canopy opening and light availability in the understory. Four years after harvesting, CO, LAI and FAPAR dif recovered or even exceeded the original values of the forest. We observed a significant correlation between CO and number of trees harvested with DBH > 30 cm. Weak correlations were found between these canopy related variables and the logging intensity. Conclusion: In conclusion, we recognized that changes of CO, LAI and FAPAR dif after timber harvesting presented short duration. This indicates that the applied logging intensities, 21.8 to 51.1% of the total basal area, did not exceed the resilience of the forest canopy and it’s recovering four years later. However, additional studies should be carried out to observe vegetation dynamics, such as species composition, vertical structure, productivity and community stability, in order to improve management schemes of secondary stands in the Atlantic Forest.","PeriodicalId":50705,"journal":{"name":"Cerne","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67154165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Evaluation of biomass, carbon storage capability, agroforestry interest of Pinus pinea L. and management practices to increase carbon stocks: a review 松木生物量、碳储量、农林业效益评价及增加碳储量的管理措施综述

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012938

K. Mechergui, S. Naghmouchi, A. Altamimi, W. Jaouadi

引用次数: 0

Interspecific variations in the habitats of Rhus tripartitum L. populations in Saudi Arabia leading to changes in morphological traits and allelopathic activity 沙乌地三叶树种群生境的种间变异导致形态特征和化感作用的变化

IF 0.8 4区农林科学

Cerne Pub Date : 2021-01-01 DOI: 10.1590/01047760202127012993

A. Altamimi, Naghmouchi Souheila

引用次数: 1

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