Effects of different land-use systems (grazing and understory cultivation) on growth and yield of semi-arid oak coppices  

作　　者：Ali Soltani Hamdollah Sadeghi Kaji Saleh Kahyani 

机构地区：[1]Department of Forest Science,Faculty of Natural Resources and Earth Sciences,Shahrekord University,P.O.Box 115,Shahrekord,Iran

出　　处：《Journal of Forestry Research》2020年第6期2235-2244,共10页林业研究（英文版）

基　　金：We express our appreciation to the 2018 forestry graduate students’team for their great help in data collection.We also gratefully acknowledge the Provincial Natural Resources Bureau for providing us with their archive of journey reports and grazing license contracts.Finally,we appreciate the anonymous reviewers who carefully read the manuscript and made many insightful comments.

摘　　要：The present study examines the extent of negative eff ects of traditional multiple land-use systems on oak coppices,from a forest management point of view.The study area was located in approximately 10,000 ha of hilly Brant’s oak(Quercus brantii Lindl.)woodlands in the central Zagros Mountains.In the same site-quality class,three land-use systems were compared:simple coppice(Co),coppice in conjunction with small ruminant grazing(CoG),and coppice with understory rain-fed wheat cultivation plus grazing(CoCG).Data on total wood volume of trunk and major branches,and annual ring growth,were collected and analyzed from 74 stands in 15 coppiced woodland patches.The results showed the advantage of Co over CoG and CoCG land-uses by 43 and 60 m 3 of mean accumulated wood volume per hectare,respectively.The diameter growth analysis also revealed an annual increase in wood production of trees in Co land-uses over 43 years,with an exception of the recent decade,when growth coincided with a severe drought.Using a back-extrapolation method,the minimum rotation age of woodlands in Co land-use was found to be 23.6 years,5 and 7 years shorter than those of CoG and CoCG land-uses,respectively.Unlike CoCG,woodlands located in Co and CoG land-use systems demonstrated a high level of agreement with self-thinning rule of−3/2.Values for the stand density index for coppiced oak woodlands were between more than 1000 for the least disturbed(Co)and less than 400 for the most disturbed woodlands(CoCG).The structure and growth rate of the coppiced oak woodlands were irreversibly disrupted by understory tillage plus grazing and in less extent by grazing alone.It was concluded that ending undergrowth cultivation in semi-arid oak coppices should be addressed as a priority by adopting minimum regulations.

关 键 词：COPPICING Land-use impact assessment Diameter growth Multi-purpose land-use Self-thinning rule Stand density index 

分 类 号：S794.1[农业科学—林木遗传育种]