文档详情

华北落叶松人工林叶面积指数实测值与冠层分析仪读-林业科学研究.pdf

发布:2018-11-15约字共5页下载文档
文本预览下载声明
林业科学研究 2012,25(2):231 235 ForestResearch   文章编号:10011498(2012)02023105 华北落叶松人工林叶面积指数实测值与冠层分析仪 读数值的比较和动态校正 1 1 1 1 1 1 1 2 郝 佳 ,熊 伟 ,王彦辉 ,于澎涛 ,刘延惠 ,徐丽宏 ,王轶浩 ,张晓蓓 (1.中国林业科学研究院森林生态环境与保护研究所,北京 100091; 2.河北农业大学林学院,河北 保定 071000) 关键词:华北落叶松;叶面积指数;LAI2000;调落物收集;校正系数 中图分类号:S791.22 文献标识码:A TheComparisonandDynamicCalibrationbetweentheLAIValuesofa LarixprincipisrupprechtiiPlantationDeterminedbyCanopy ScannerandLitterfallCollection 1 1 1 1 1 1 1 2 HAOJia,XIONGWei,WANGYanhui,YUPengtao,LIUYanhui,XULihong,WANGYihao,ZHANGXiaobei (1.ResearchInstituteofForestEcology,EnvironmentandProtection,ChineseAcademyofForestry,Beijing 100091,China; 2.ForestryCollege,AgriculturalUniversityofHebei,Baoding 071000,Hebei,China) Abstract:InordertotesttheaccuracyoftheusuallyusedfixedcalibrationfactorofthecanopyscannerofLAI2000 formeasuringtheleafareaindex(LAI),aLarixprincipisrupprechtiiplantationwaschoseninthesmallwatershedof XiangshuihelocatedattheLiupanMountainsofNingxiaHuiAutonomousRegionofNWChina,theLAIwasmeas uredinOctober2010,aperiodfromfullcanopytothetotalfallofneedles,byusingboththeLAI2000andlitter fallcollectionmethod.Then,acomparisonwasmadebetweentheLAIvaluesdeterminedbythelitterfallcollection andthatcalculatedbasedonthefiguresreadfromLAI2000andthefixedcalibrationfactor(1.49).Itshowedthat theaverageofLAImeasurementsofthe2methodswasveryclose,withadifferenceofonly5%.However,thecal culatedLAIfromLAI2000wasobviouslyhigherthanthetruevaluesdeterminedbylitterfallcollectionwhenthe canopywasfullofneedles;andobviouslylowerthanthetruevaluewhenthecanopywassparsea
显示全部
相似文档