简介：

简介：

简介：Thepaperanalyzedthebasiccharacteristicsoffast-growingandhigh-yieldplantation,classifiedandidentifiedtheecologicalproblemsinitsdevelopment,andfinallyproposedthebasicprinciplesandcorrespondingtechnicalmeasuresforfast-growingandhigh-yieldplantationecosystemmanagementbasedontheseproblems.

简介：Thispaperdealswiththeinitialplustreesselectedintheexcellentplantations,and60excellentphenotypesweregained.Withcorrelationanalysis,pathanalysis,regressionanalysisandclusteringanalysis,theresultsofstudyingtheeffectof13factorsonunityieldshowthattheheight,crownareaandbranchingabilityarehighlysigniflcantcorrelatedwiththeunityield.Crownarea,soilfertility,anthracnoseinfectionrate,proportionofnutrientandfruitedbranchesandmeanfruitweighthave...

简介：Background:Growthandyieldmodelsareimportanttoolsforforestplanning.Duetoitsgeographiclocation,topology,andhistoryofmanagement,theforestsoftheAdirondacksRegionofNewYorkareuniqueandcomplex.However,onlyarelativelylimitednumberofgrowthandyieldmodelshavebeendevelopedand/orcanbereasonablyextendedtothisregioncurrently.Methods:Inthisanalysis,571long-termcontinuousforestinventoryplotswithatotalof10-52yearsofmeasurementdatafromfourexperimentalforestsmaintainedbytheStateUniversityofNewYorkCollegeofEnvironmentalScienceandForestryandonenonindustrialprivateforestwereusedtodevelopanindividualtreegrowthmodelfortheprimaryhardwoodandsoftwoodspeciesintheregion.Species-specificannualizedstaticanddynamicequationsweredevelopedusingtheavailabledataandthesystemwasevaluatedforlong-termbehavior.Results:EquivalencetestsindicatedthattheNortheastVariantoftheForestVegetationSimulator(FVS-NE)wasbiasedinitsestimationoftreetotalandboleheight,diameterandheightincrement,andmortalityformostspeciesexamined.Incontrastthedevelopedstaticandannualizeddynamic,species-specificequationsperformedquitewellgiventheunderlyingvariabilityinthedata.Long-termmodelprojectionswereconsistentwiththedataandsuggestarelativelyrobustsystemforprediction.Conclusions:Overall,thedevelopedgrowthmodelshowedreasonablebehaviorandisasignificantimprovementoverexistingmodelsfortheregion.Themodelalsohighlightedthecomplexitiesofforestdynamicsintheregionandshouldhelpimproveforestplanningeffortsthere.

简介：Background:InmidhillsofWesternHimalayas,HimachalPradeshIndia,growth,yieldandeconomicsofSolanumkhasianumasapotentialmedicinalherbunderPinusroxburghii(Chirpine)plantationhasbeenstudiedfortwoconsecutiveyearstoassesstheperformanceofSolanumkhasianuminundercanopyofPinusroxburghiifordevelopingSolanumkhasianumandPinusroxburghiibasedinnovativesilvi-medicinalsystem.Methods:Growthparameterssuchasplantheight,numberofbranchesperplantandleafareaindexfollowedbyyieldwereestimatedafterSolanumkhasianumwasgrownonthreetopographicalaspectsas;Northern,North-westernandWesternataspacingof45cmx45cm,followedbythreetillagedepthsas;minimum(0cm),medium(upto10cm)anddeeptillage(upto15cm),inopenandbelowcanopyconditionstreatment.ThestudywasconductedtoexplorethepossibilityofusingSolanumkhasianumbasedsilvi-medicinalsystemtoutilizethebelowcanopyofChirpineforestforenhancingtheproductivityofforestsbesidestheconservationofthemedicinalherb.Results:Thegrowthparameterssuchasplantheight,numberofbranchesperplantandleafareaindexwerenonsignificantlyaffectedbytopographicalaspectsandtillagepractices,bothbelowcanopyandopenconditionsexceptfreshweightanddryweightofberriesduringharvestingstage.Themaximumyield(0.61t·ha~(-1))wasobservedonWesternaspectinopenconditionsascomparedtobelowcanopyofChirpine.ThehighestgrossreturnswereobservedforthecropcultivatedonWesternaspectunderdeeptillageinopenconditionsthanotheraspectandtillagecombinations.HoweverthepositivenetreturnsfromthecropsraisedinbelowcanopyofChirpineindicatesitspossibleeconomicviabilityunderagroforestrysystemasthegrossreturnswashigherthanthecostofcultivation.Conclusion:SolanumkhasianumwhengrowninbelowcanopyofPinusroxburghii,itsgrowthandyieldindicatedpositivenetreturns.SolanumkhasianumandPinusroxburghiibasedsilvi-medicinalsystemha