利用多花黄精在中国的260个地理分布记录,结合53项环境因子,应用最大熵模型(MaxEnt)研究影响多花黄精适宜性分布的生态因子,结合ArcGIS软件预测多花黄精全国潜在适生分布区。用受试者工作特征曲线(ROC曲线)检测模型精度、刀切法(Jackkni...利用多花黄精在中国的260个地理分布记录,结合53项环境因子,应用最大熵模型(MaxEnt)研究影响多花黄精适宜性分布的生态因子,结合ArcGIS软件预测多花黄精全国潜在适生分布区。用受试者工作特征曲线(ROC曲线)检测模型精度、刀切法(Jackknife test)筛选主导环境变量。研究结果显示,MaxEnt模型预测结果较好(AUC>0.9);基于当前情景构建的多花黄精地理分布模型的AUC(area under curve)均达到"极好"的标准,说明模型预测结果可用于该研究。研究发现影响多花黄精适宜性生长的主要环境因子为11月份、3月份、2月份、4月份、5月份和10月份月降水量、最湿月降水量、年均温变化范围和土壤类型共9项环境因子;多花黄精在我国的潜在适生性分布区域较广,主要集中在湖南、湖北西部、广东、广西东北部、贵州东南部、江西、安徽西南部、福建、浙江、陕西、河南西南部和重庆等地区。该研究对多花黄精潜在分布区进行了生长等级划分,生成了多花黄精生长适宜性区划图。通过基于MaxEnt的潜在分布范围与文献资料记载分布范围对比分析,拓展了人们对多花黄精分布范围的认识。展开更多
The purpose of this work is to assess wind potential on the Kanfarandé site (Guinea). The data used for this research covers a period of 6 years (2018 to 2023) and consists of in situ data (Boké meteorologic...The purpose of this work is to assess wind potential on the Kanfarandé site (Guinea). The data used for this research covers a period of 6 years (2018 to 2023) and consists of in situ data (Boké meteorological station) and satellite products via NASA Power Larc. The study is based on sorted hourly data (speed and direction). The treatments focus on the monthly, annual and seasonal average of speeds, by sector and their frequencies as well as the annual available powers. The obtained results made it possible, on the one hand, to assess wind potential and, on the other hand, to highlight the most favorable periods for wind energy exploitation. The analyzes show the months of July and August have the best average wind speeds with 5.01 m/s and 5.34 m/s respectively. Average wind speeds are higher during the day than at night with a peak observed at 6 p.m. The study also shows that the prevailing winds are oriented towards the South-West. The Weibull parameters determined for the site give an average of 4.5 m/s for the scale parameter and for the shape parameter 2.40 corresponding to an average power density of 65 w/m2 with an annual available power of 194.80 W/m2 and an annual available energy of 1706.45 kWh/m2.展开更多
Talinopsis frutescens(Anacampserotaceae,a family that is close related to Cactaceae)is a succulent species endemic to North America.The aim of this study was to explore,using Ecological Niche Modeling(ENM),changes in ...Talinopsis frutescens(Anacampserotaceae,a family that is close related to Cactaceae)is a succulent species endemic to North America.The aim of this study was to explore,using Ecological Niche Modeling(ENM),changes in potential distribution ranges considering different climate scenarios:past conditions during the Last Inter Glacial(LIG)and the Last Glacial Maximum(LGM),the present and projections for 2070(RCP 2.6 to 8.5).A pattern of contraction is observed during the LIG,which agrees with other studies focused in species from arid environments.This pattern was followed by a migration towards the south during the LGM and a possible recent expansion to the north as is observed in the present scenario.All future projections show the same contraction and fragmentation patterns,resulting in three discontinuous areas:the northern part of the Chihuahuan Desert,the southern-central part of the Mexican Plateau,and the smallest one in the Tehuacán-Cuicatlán Valley.Our projections for future scenarios agree with other studies and support that global climate change tends to alter the current distribution of arid environment species.展开更多
Predictive potential distribution modeling is of increasing importance in modern herpetological studies and determination of environmental and conservation priorities. In this article we provided results of analysis a...Predictive potential distribution modeling is of increasing importance in modern herpetological studies and determination of environmental and conservation priorities. In this article we provided results of analysis and forecasts of the potential distribution of smallscaled rock agama Paralaudakia microlepis （Blanford, 1874） using the distribution models through Maxent （www.cs.princeton.edu/- schapire / maxent）. We made an attempt for comparison of input of bioclimatic factors and characteristics of biotope distribution for three species of genus Paralaudalda. Constructed model identified dissemination of Paralaudakia microlepis enough performance （AUC = 0.972 with dispersion 0.003）. According to the map constructed, the most suitable habitats of smallscaled rock agama Paralaudakia microlepis are located in southern and eastern Iran, the west of central Pakistan and southeastern Afghanistan.展开更多
文摘利用多花黄精在中国的260个地理分布记录,结合53项环境因子,应用最大熵模型(MaxEnt)研究影响多花黄精适宜性分布的生态因子,结合ArcGIS软件预测多花黄精全国潜在适生分布区。用受试者工作特征曲线(ROC曲线)检测模型精度、刀切法(Jackknife test)筛选主导环境变量。研究结果显示,MaxEnt模型预测结果较好(AUC>0.9);基于当前情景构建的多花黄精地理分布模型的AUC(area under curve)均达到"极好"的标准,说明模型预测结果可用于该研究。研究发现影响多花黄精适宜性生长的主要环境因子为11月份、3月份、2月份、4月份、5月份和10月份月降水量、最湿月降水量、年均温变化范围和土壤类型共9项环境因子;多花黄精在我国的潜在适生性分布区域较广,主要集中在湖南、湖北西部、广东、广西东北部、贵州东南部、江西、安徽西南部、福建、浙江、陕西、河南西南部和重庆等地区。该研究对多花黄精潜在分布区进行了生长等级划分,生成了多花黄精生长适宜性区划图。通过基于MaxEnt的潜在分布范围与文献资料记载分布范围对比分析,拓展了人们对多花黄精分布范围的认识。
文摘The purpose of this work is to assess wind potential on the Kanfarandé site (Guinea). The data used for this research covers a period of 6 years (2018 to 2023) and consists of in situ data (Boké meteorological station) and satellite products via NASA Power Larc. The study is based on sorted hourly data (speed and direction). The treatments focus on the monthly, annual and seasonal average of speeds, by sector and their frequencies as well as the annual available powers. The obtained results made it possible, on the one hand, to assess wind potential and, on the other hand, to highlight the most favorable periods for wind energy exploitation. The analyzes show the months of July and August have the best average wind speeds with 5.01 m/s and 5.34 m/s respectively. Average wind speeds are higher during the day than at night with a peak observed at 6 p.m. The study also shows that the prevailing winds are oriented towards the South-West. The Weibull parameters determined for the site give an average of 4.5 m/s for the scale parameter and for the shape parameter 2.40 corresponding to an average power density of 65 w/m2 with an annual available power of 194.80 W/m2 and an annual available energy of 1706.45 kWh/m2.
基金partially funded by the National Council of Science and Technology, Mexico (PhD scholarship 436041)the Cactus and Succulent Society of America grantsupported by the Educational Professional Development Program (#UAA-PTC-169) granted to the corresponding author by the Public Education Department and the Autonomous University of Aguascalientes, Mexico
文摘Talinopsis frutescens(Anacampserotaceae,a family that is close related to Cactaceae)is a succulent species endemic to North America.The aim of this study was to explore,using Ecological Niche Modeling(ENM),changes in potential distribution ranges considering different climate scenarios:past conditions during the Last Inter Glacial(LIG)and the Last Glacial Maximum(LGM),the present and projections for 2070(RCP 2.6 to 8.5).A pattern of contraction is observed during the LIG,which agrees with other studies focused in species from arid environments.This pattern was followed by a migration towards the south during the LGM and a possible recent expansion to the north as is observed in the present scenario.All future projections show the same contraction and fragmentation patterns,resulting in three discontinuous areas:the northern part of the Chihuahuan Desert,the southern-central part of the Mexican Plateau,and the smallest one in the Tehuacán-Cuicatlán Valley.Our projections for future scenarios agree with other studies and support that global climate change tends to alter the current distribution of arid environment species.
基金partially supported by grants from the Russian Foundation for Basic Research to NBA (Project 12-04-00057)the Scientific School Support Program (NSh- 2990.2014)
文摘Predictive potential distribution modeling is of increasing importance in modern herpetological studies and determination of environmental and conservation priorities. In this article we provided results of analysis and forecasts of the potential distribution of smallscaled rock agama Paralaudakia microlepis （Blanford, 1874） using the distribution models through Maxent （www.cs.princeton.edu/- schapire / maxent）. We made an attempt for comparison of input of bioclimatic factors and characteristics of biotope distribution for three species of genus Paralaudalda. Constructed model identified dissemination of Paralaudakia microlepis enough performance （AUC = 0.972 with dispersion 0.003）. According to the map constructed, the most suitable habitats of smallscaled rock agama Paralaudakia microlepis are located in southern and eastern Iran, the west of central Pakistan and southeastern Afghanistan.
