Determination of forest communities on the basis of small plots(microplots)within the geomorphologically diverse landscape of the Kras plateau(Italy,Slovenia)  

作　　者：Aljaz Jakob Mateja Breg Valjavec Andraz Carni 

机构地区：[1]Research Centre of the Slovenian Academy of Sciences and Arts,Jovan Hadzi Institute of Biology,Novi trg 2,1000,Ljubljana,Slovenia [2]University of Ljubljana,Biotechnical Faculty,Department of Biology,Vecna pot 111,1000,Ljubljana,Slovenia [3]Research Centre of the Slovenian Academy of Sciences and Arts,Anton Melik Geographical Institute,Novi trg 2,1000,Ljubljana,Slovenia [4]University of Nova Gorica,School for Viticulture and Enology,Vipavska 13,5000,Nova Gorica,Slovenia

出　　处：《Forest Ecosystems》2025年第2期265-274,共10页森林生态系统(英文版)

基　　金：supported by the Slovenian Research and Innovation Agency(grant numbers ARIS P1-0236,ARIS P6-0101,ARIS J6-2592).

摘　　要：The article deals with forest communities that develop on small surfaces on steep gradients of the geomorphologically diverse landscape of the Kras plateau.They appear in small depressions called dolines,where a steep gradient of ecological conditions appears over a small spatial scale.We tried to detect the turnover of forest communities on this small scale and steep gradient with small plots(microplots)of 4 m^(2)arranged in a continuous transect.We sampled only the ground layer and estimated the cover of each vascular plant species.The main problem was that we could not sample vegetation plots in standard sizes,which would allow a standard classification procedure.We built an expert system based on all of the relevant standard vegetation plots from the region and applied this system on a microplot matrix.We classified one third of microplots in this way,but the remainder were classified by semi-supervised k-means clustering.We thus established 8 communities that appear in dolines and compared their characteristics and ecological conditions by Ellenberg indicator values.Our results show that oak-hornbeam forests can be found in the bottom of dolines.Towards the bottom of deeper dolines,mesophilous ravine forests dominated by sycamore on rocky places,and sessile oak forests on deeper soils appear.On lower slopes,thermophilous ravine forests dominated by limes appear on rocky places.Upper slopes are dominated by Turkey oak,hophornbeam-pubescent oak forests and shrub formations.Turkey oak forests can be found on rather deeper soils than hophornbeam-pubescent oak forests.At the top,hophornbeam-pubescent oak forests can be found that build the zonal vegetation of the region.On rock walls vegetation of rock crevices can be found.The high biodiversity of the region supports the idea that diverse karstic features might have the potential for formation of refugia in future foreseen climate change,related to the potential of karstic relief to create diverse climatic conditions.

关 键 词：DOLINE Expert system Forest Karst k-means REFUGIUM TRANSECT Vegetation 

分 类 号：S718.5[农业科学—林学]