Mature stand developmental stage has ceased to constitute the most suitable habitat for the capercaillie in the Augustow Forest,Poland  

作　　者：Stanisław Drozdowski Dorota Zawadzka Grzegorz Zawadzki Marcin Studnicki Bogdan Brzeziecki 

机构地区：[1]Institute of Forest Sciences,Warsaw University of Life Sciences,Nowoursynowska 159,02-776 Warszawa,Poland [2]Department of Forest Sciences,University of Lodz,Branch in Tomaszow Mazowiecki,Konstytucji 3 Maja 65/67,97-200 Tomaszow Mazowiecki,Poland [3]Institute of Agriculture,Warsaw University of Life Sciences,Nowoursynowska 159,02-776 Warszawa,Poland

出　　处：《Forest Ecosystems》2021年第4期685-698,共14页森林生态系统（英文版）

摘　　要：Background:Forest management affects the habitat conditions for many forest-dwelling species.Among them,the capercaillie(Tetrao urogallus)is a rare forest grouse inhabiting old,mature forests.We compared the structure of forest habitat among 9 active and 9 abandoned leks in the Augustow Forest(North-Eastern Poland),within a radius of 1 km of the leks,defined as the Key Areas for the capercaillie in lowland temperate forest.Habitat measurements were conducted on 1779 circular plots.Assessments made on all plots related to 13 habitat variables measured or noted in the field,including stand structure,canopy closure,stand developmental stage,percentage of Scots pine(Pinus sylvestris),soil fertility and soil moisture,the share of undergrowth,the cover of shrubs,the cover of bilberry(Vaccinium sp.),and the presence of certain habitat elements important to the capercaillie.Results:To compare the still-occupied and the abandoned KAs for the capercaillie,a logistic regression model was developed.The variables best explaining differences between these two categories were:the occurrence of undergrowth layers,canopy closure in the second canopy layer,and stand age.According to the model,with the increase of the shrub-layer cover as well as the density of trees,the probability of the presence of the capercaillie decreased.The capercaillie in the area of the Augustow Forest occupy mainly dry and poor,middle-aged,pinedominated forests,with a moderate extent of stand canopy closure and only weakly-developed layers of undergrowth.Conclusions:The filling-in of mature stands with sub-canopy trees and shrubs(the process which is stimulated by climate change and site eutrophication)causes structural changes,which are unfavourable to the capercaillie.This might explain why in the course of the recent decades the capercaillie has abandoned the oldest stands,distinguished by the presence of bigger shares of undergrowth.The capercaillie has shifted to younger stands,which reveal a lesser extent of canopy closure and a more limited develo

关 键 词：Habitat suitability Lek occupancy Logistic regression Lowland forest Stand structure Tetrao urogallus 

分 类 号：S718.5[农业科学—林学]