Ecological distribution and population structure of Litsea glaucescens(Lauraceae)in the ravines of Sierra Fría and Sierra Laurel,Central Mexico  

作　　者：Mara Irais FLORES-GALLEGOS Edmundo GARCIA-MOYA Angelica ROMERO-MANZANARES Mario LUNA-CAVAZOS Martin Alfonso MENDOZA-BRISENO Heike VIBRANS 

机构地区：[1]Posgrado en Botánica,Colegio de Postgraduados,Campus Montecillo.Km 36.5,carretera México-Texcoco,Montecillo,Texcoco,Edo.de México,56230,México [2]Colegio de Postgraduados,Campus Veracruz.Carretera Jalapa Veracruz Km 88.5,Altamirano,91690,Veracruz,México

出　　处：《Journal of Mountain Science》2022年第7期1945-1960,共16页山地科学学报（英文）

基　　金：the Mexican National Council for Science and Technology(Consejo Nacional de Ciencia y Tecnología,CONACYT)for the scholarship granted to the first author;To Ofelia Castillo Díaz from the Mexican National Protected Areas Commission in the state of Aguascalientes for offering support and financing part of the field work。

摘　　要：Litsea glaucescens Kunth(Mexican bay leaf,laurel)has a wide distribution in Mexico,growing at both riparian and rupicolous environments in the mountainous region of the Central Highlands of the country.Sierra Fría-Sierra Laurel is a protected natural area covered by a dry forest.The Mexican bay leaf is associated with the oak forest,especially on ravines.The species has been considered at risk in recent years.This research is focused on analyzing the elements of the environment of the ravines,which are influencing the distribution and establishment of laurel populations in the region.Two mountainous regions of Aguascalientes were selected,Sierra Fría and Sierra Laurel.Three ravines of the basin were selected to obtain environmental data.Variables registered were topographic,edaphic,and biotic.Principal component analysis was used to identify ecological factors associated with the presence of L.glaucescens.Mexican bay leaf populations were registered in 10 ravines.At the structural level in the community,29 woody species were registered,Mexican bay leaf had an Importance Value Index of 15.8,ranking 10th among all species.Individuals of laurel were classified by size classes(S,individuals with heights ranging from 0 to 20 cm;S,heights ranging from 0.2 to 1.0 m;S,heights between 1 and 2 m with light trace of flowering;S,heights greater than 2 m with flowering greater than 30% of the canopy;and S,individuals with heights greater than 5 m,curved trunk and basal regrowth)to obtain the population structure.The importance index value for all the species in the riparian community was calculated to the community level.Edaphic factors that characterized the presence of Mexican bay leaf were a high percentage of rock coverage(90%),less mulch depth,and sandy loam shallow soils.Sites that showed higher cation exchange capacity had a higher presence of individuals of the S,S,and Ssize classes.Class Sindividuals were found in shady places with 97% of intercepted light.Individuals of classes Sand Sendure less shady places(75%�

关 键 词：Dry Forest Ephemeral stream Importance Value Index Mexican bay leaf Population structure Principal Component Analysis 

分 类 号：Q948[生物学—植物学]