Effects of dieback on the vegetative, chemical, and physiological status of mangrove forests, Iran  

作　　者：Vahid Farashi KAHNOUJ Marzieh REZAI Rasool MAHDAVI Maryam MOSLEHI Saiedeh ESKANDARI 

机构地区：[1]Natural Resources Engineering Group,Desert Management and Control,University of Hormozgan,Hormozgan,Bandarabass 7916193145,Iran [2]Natural Resources Engineering Group,Faculty of Agriculture and Natural Resources,University of Hormozgan,Hormozgan,Bandarabass 7916193145,Iran [3]Research Division of Natural Resources,Hormozgan Agricultural and Natural Resources Research and Education Center,Agricultural Research,Education and Extension Organization(AREEO),Bandarabbas 7915847669,Iran [4]Forest Research Division,Research Institute of Forests and Rangelands,Agricultural Research,Education and Extension Organization(AREEO),Tehran 1496793612,Iran

出　　处：《Journal of Arid Land》2023年第11期1391-1404,共14页干旱区科学（英文版）

摘　　要：Mangrove forests are valuable resources in tropical and subtropical regions,which have been faced dieback due to various human activities including rapid expansion of shrimp farming,urban development,and pollution,as well as natural factors such as rising sea level,increasing air temperature,drought,and sharp decrease in rainfall.However,the mechanisms of dieback of mangrove forests are not well understood.Therefore,this research aimed to assess the vegetative,chemical,and physiological status of grey mangrove(Avicennia marina(Forsk.)Vierh.)forests at different intensities of dieback in the Hormozgan Province,Iran.A total of 40 plots categorized into four dieback intensities(severe,medium,low,and control)were randomly selected for monitoring,and various parameters related to vegetative,chemical,and physiological status of grey mangrove forests were examined.The results revealed that the control group had the highest tree density,seedling density,vitality levels,aerial root density,and aerial root height.Generally,as dieback severity increased,a decrease in demographic and vegetative parameters of trees and seedlings was observed in the dieback treatments.The amounts of heavy metals(lead,cadmium,and nickel)in the sediment,roots,and leaves of grey mangrove trees at different dieback levels indicated that lead levels were the highest in the sediment,roots,and leaves in the severe dieback treatment.At the same time,the control had the lowest values.Cadmium concentrations in the sediment followed the pattern of severe dieback>moderate dieback>low dieback>control with no significant differences in the roots and leaves.Nickel amounts in all three parts,i.e.,sediment,roots,and leaves showed the highest levels in the severe dieback treatment.Furthermore,metal level analysis in the organs of grey mangrove trees at different dieback levels revealed that lead and nickel were more abundant in the root organ compared with the leaves.In contrast,the leaf organ exhibited the highest cadmium levels.Dieback significantly impacted

关 键 词：NICKEL FORESTS GREY 

分 类 号：S718.5[农业科学—林学]