Vegetation Response to Soil and Morphological Properties in an Arid Region Alluvial Fan Landscape,Pre-Andes of San Juan,Argentina  

作　　者：Daniel Germán Flores Raúl Emmanuel Ocaña Edgardo Melián Andrés Ortega María Yanina Esper Angillieri María Alejandra Pittaluga 

机构地区：[1]CIGEOBIO(CONICET-UNSJ)Av.JoséI.de la Roza y Meglioli,Rivadavia,San Juan J5402DSC,Argentina [2]Gabinete de Geología Ambiental,INGEO,Universidad Nacional de San Juan,Av.JoséI.de la Roza y Meglioli,Rivadavia,San Juan J5402DSC,Argentina

出　　处：《Journal of Earth Science》2025年第2期408-427,共20页地球科学学刊(英文版)

基　　金：supported by PICT 4343-2016。

摘　　要：The Monte Desert is characterized by a great diversity of landforms created with fluvial,alluvial which the vegetation patterns are related to.The present work has the following objectives:(1) determine whether topographical attributes,surface characteristics,soil properties and vegetation patterns vary between alluvial landforms,and(2) define whether morphometric,soil and surface properties influence vegetation patterns along alluvial landscape.Morphometric data were obtained by processing a 5 m digital elevation model.The coverage of rock fragments,fine sediments and mulch was quantified.Observations and descriptions of the soil profiles were restricted to the uppermost 50 cm.Vegetation properties were calculated using a Point Quadrat Method.The relationship between variables was evaluated through multivariate statistical analysis.The main results show the presence of 45 plant species distributed in 19 families,where shrubs are dominant.The wind effect,topographic wetness and dissection of the landscape are limiting factors of diversity.The coverage of superficial rock fragments influence vegetation coverage through the distribution and availability of rainwater.Furthermore,the different soil textures reveal that the silt content favors an increase in vegetation coverage.The presence of V horizon could condition the installation and development of vegetation in the early stages of growth.

关 键 词：alluvial geomorphology soil texture vegetation patterns arid landscapes MORPHOMETRICS environmental geology 

分 类 号：Q948[生物学—植物学]