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1、欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗欗技術(shù)開發(fā)doi:10.13360/j.issn.1000-8101.2014.03.033伐區(qū)立木蓄積量估測方法比較及出材量估算*葛曉雯,王立海,鮑震宇,孫天用(東北林業(yè)大學(xué)工程技術(shù)學(xué)院,哈爾濱150040)摘要:伐前調(diào)查是森林經(jīng)營單位一項(xiàng)重要的基礎(chǔ)性工作,為尋求一種簡便、快速、高精度的伐前蓄積量估測方法,以廣西斯道拉恩索林業(yè)有限公司(SEGX)的一個作業(yè)小班為例,把采伐機(jī)自動記錄的帶皮數(shù)據(jù)作為真值
2、,采用樣帶實(shí)測法、樣圓實(shí)測法、角規(guī)樣地和每木檢尺4種方法估測小班蓄積量,對比分析各方法的估測精度。結(jié)果表明:樣帶法、樣圓法和每木檢尺3種方法的估測精度均在90%以上,滿足抽樣控制的精度要求。每木檢尺雖然精度最高,但工作量也最大,對于公司日常的伐前調(diào)查,建議使用樣帶或樣圓實(shí)測法。角規(guī)樣地的精度稍低,為87.2%,原因在于儀器自身缺口誤差、樣點(diǎn)位移、觀測誤差以及坡度等因素的影響。對于公司許多面積大、地勢復(fù)雜的作業(yè)單元,樣地調(diào)查不容易開展,仍建議按技術(shù)要求采用角規(guī)測量,這樣會比樣地調(diào)查效率更高。最后,利用銷售數(shù)據(jù)
3、3算出材種出材量為170.3m,出材率高達(dá)88.3%,這是由于稱質(zhì)量消除了人為測量誤差和木材堆放空隙的影響。關(guān)鍵詞:立木蓄積量;樣地調(diào)查;角規(guī)樣地;每木檢尺;出材量Comparisonsonestimationmethodsforstandvolumeandcalculationofoutputvolumeinstumparea∥GEXiaowen,WANGLihai,BAOZhenyu,SUNTianyongAbstract:Pre-harvestinginventoryisanimportantlyba
4、sicworkofforestmanagementunit.Inordertoseekasimple,rapidandhigh-precisionmethodforvolumeestimationduringpre-harvestinginventory,thispapertookanoperationalsub-com-partmentofGuangxiStoraEnsoForestryCo.,Ltd(SEGX)asasample,andconsideredtheharvesterover-barkdat
5、aastruevalue.FourmeasuringmethodsincludingStripsampling,Circlesampling,TallyandAngleGaugeplotwererespectivelya-doptedtoestimatethesub-compartmentstandvolume.Theestimatingprecisionofeachmethodwereanalyzedbybeingcomparedwithtruevalue.Theresultsshowedthatesti
6、matingprecisionofthemethodofStripsample,CirclesampleandTallywereallabove90%,satisfyingtherequirementofsamplingprecision.ThoughtheprecisionofTallywasthehighest,itsworkloadwasalsothelargest.AlowerprecisionofAngleGaugeplotwas87.2%,whichwasmainlycausedbymanyfa
7、ctorssuchassloterrorofitsown,samplingpointdisplacement,observationerrorandgradient.Formanyoperationalu-nitswithlargeareaandcomplexterrain,however,it’snoteasyforsampleplotinventory.Inthiscase,measuringbyAn-gleGaugestrictlyaccordingtotherequirementsoftechnol
8、ogywasstillrecommendedinorderthatthehigherinventoryeffi-3ciencycanbeobtained.Intheend,theoutputvolumecalculatedonthebasisofsaledatawas170.3m,andtheoutturnpercentagereachedupto88.3%.Thiswasbecauseweighingsalee