Status,structure and environmental variations in semi-arid mangroves of India  

作　　者：G.A.Thivakaran Seema B.Sharma Abhiroop Chowdhury Arumugam Murugan 

机构地区：[1]Coastal and Marine Ecology Division,Gujarat Institute of Desert Ecology,Bhuj,Gujarat,India [2]Department of Earth and Environmental Sciences,KSKV Kachchh University,Mundra Road,Bhuj,Gujarat,India [3]Department of Chemistry,Manipal University Jaipur,Dehmi Kalan,Jaipur-Ajmer Express Way,Jaipur,Rajasthan 303007,India [4]Central Marine Fisheries Research Institute,Mandapam Regional Centre,Marine Fisheries P.O,Mandapam Campus,Ramanathapuram,Tamil Nadu 623520,India

出　　处：《Journal of Forestry Research》2020年第1期163-173,共11页林业研究（英文版）

基　　金：financially supported by the Marine National Park and Sanctuary(MNP&S);Jamnagar,Gujarat State,India through the project,"Mangrove Vegetation Characteristics of Gulf of Kachchh"

摘　　要：The semi-arid mangroves of the Gulf of Kachchh,the largest ecosystems on the west coast of India,are poorly studied in terms of vegetation structure and environmental parameters in spite of their conservation significance.Therefore,it is necessary to document the structural features of these mangroves in view of ongoing coastal industrial development.Mangrove forest structure in 10 locations on the northern and southern coasts of the Gulf of Kachchh were assessed using the line intercept transect method.Descriptions included density of young and mature age classes,tree heights,diameters at breast height(DBH)and aboveground biomass,along with seven significant environmental variables.Mature tree densities ranged from 350 to 1567 ind.ha-1,while average height and girth at breast height ranged from 1.0 to 6.8 m and 3.0 to 137.0 cm,respectively.The majority of trees(55.6%)were in B 1.8 m height class followed by a 1.9 to 2.4 m class(25.1%).DBH was most often in class 2 cm or lower than that.Among the canopy index classes,more trees were recorded in class ≤2 cm.The regeneration density was greater than the recruitment class.This study indicates that the poor structural attributes of Avicennia marina Vierth.var.acutissima Stapf and Mold dominated mangroves are largely due to aridity induced by scarce and erratic rainfall and high soil and water salinities.The results should be valuable in conserving and sustainably managing these mangroves in the face of developmental activities.The semi-arid mangroves of the Gulf of Kachchh,the largest ecosystems on the west coast of India,are poorly studied in terms of vegetation structure and environmental parameters in spite of their conservation significance.Therefore,it is necessary to document the structural features of these mangroves in view of ongoing coastal industrial development.Mangrove forest structure in 10 locations on the northern and southern coasts of the Gulf of Kachchh were assessed using the line intercept transect method.Descriptions included density of young and mature age classes,tree heights,diameters at breast height（DBH） and aboveground biomass,along with seven significant environmental variables.Mature tree densities ranged from 350 to 1567 ind.ha-1,while average height and girth at breast height ranged from 1.0 to 6.8 m and 3.0 to 137.0 cm,respectively.The majority of trees（55.6%）were in <1.8 m height class followed by a 1.9 to 2.4 m class（25.1%）.DBH was most often in class 2 cm or lower than that.Among the canopy index classes,more trees were recorded in class <2 cm.The regeneration density was greater than the recruitment class.This study indicates that the poor structural attributes of Avicennia marina Vierth.var.acutissima Stapf and Mold dominated mangroves are largely due to aridity induced by scarce and erratic rainfall and high soil and water salinities.The results should be valuable in conserving and sustainably managing these mangroves in the face of developmental activities.

关 键 词：MANGROVES Vegetation structure Abiotic factors BIODIVERSITY Forest management Aboveground biomass CONSERVATION 

分 类 号：O17[理学—数学]