简介:fruit and gingerbread.The popularity of the Christmas tree grew in Britain during the first half of the 20th century,which was too heavy and kept breaking. It was only in the mid 20th century that a viable alternative was found.Artificial trees were invented in the 1880's in a bid to try and stop some of the damage being caused to real trees due to people lopping the tip off large trees,Martin Luther (the founder of the Protestant religion) was the first to decorate an indoor tree with candles when he attempted to recreate the stars shining over a forest of evergreens.The first mention of decorated trees being taken indoors came in 1605 in Germany - a country with a long Christmas tree history
简介:fruit and gingerbread.The popularity of the Christmas tree grew in Britain during the first half of the 20th century,which was too heavy and kept breaking. It was only in the mid 20th century that a viable alternative was found.Artificial trees were invented in the 1880's in a bid to try and stop some of the damage being caused to real trees due to people lopping the tip off large trees,Martin Luther (the founder of the Protestant religion) was the first to decorate an indoor tree with candles when he attempted to recreate the stars shining over a forest of evergreens.The first mention of decorated trees being taken indoors came in 1605 in Germany - a country with a long Christmas tree history
简介:Alongtimeago,therewasahugeappletree.Alittleboylovedtocomeandlayarounditeveryday.Heclimbedtothetreetop,atetheapples,tookanapundertheshadow…Helovedthetreeandthetreelovedtoplaywithhim.Timewentby…Thelittleboyhadgrownup
简介:TheMarvelousGingkoTreeByCHENSHUPENGDOUBTLESSeveryonehasherdofthegingko,butfewknowhowspe-cialatreeitreallyis.Scientistscallthe...
简介:Background:InIndia,rubber(Heveabrasiliensis)plantationscover~0.8millionhaofland,emphasizingitssignificantroleintheEarth'scarbondynamics.Therefore,itisimportanttoestimatethebiomassstocksofplantationspreciselyinthecontextofcarbonmanagement.PreviousstudiesinIndiahavefocusedondevelopmentofallometricequationsforestimatingabovegroundbiomass(AGB)throughharvestingyoungertrees(upto14yr)onlyoronstudieswithsmallsamplesizeswithoutassessingmodelbias.Theobjectiveofthisstudywastodevelopbiomassestimationmodelsfordifferenttreecomponentsinrubberplantationsandassessmodelpredictiveperformanceatthestandlevel.Methods:Atotalof67treeswereharvestedfromplantationsofdifferentages(6,15,27and34yr)inNorthEastIndiaandtheirdiameterat200cm(D),heightanddryweightsofdifferenttreecomponentswererecorded.ThedatawereusedforevaluationofH-Dandbiomassestimationmodelsatthestandlevel.Results:TheMichaelis-Mentenfunctionwasfoundtobethemostappropriatemodelforestimatingtreeheightamong10commonlyusedH-Dmodels.ForestimationofAGBandcoarserootbiomass,amodelthatinvolvestreevolume(i.e.D2H)wasfoundtoprovidebetterpredictionthaneitherDorHaloneoramodelthatcombinesH,Dandstanddensity.TheestimatedAGBvariedfrom28Mg·ha~(-1)in6yr.oldplantationto169Mg·ha~(-1)in34yr.oldplantations.Thecoarserootbiomasswasestimatedat4Mg·ha~(-1)for6yr.oldplantationand12Mg·ha~(-1)for34yr.oldstands.Conclusions:Itisconcludedthatmodelsinvolvingtreevolumearemoreappropriateforregionallevelbiomassestimationthansimplepower-lawmodelsforindividualstands.Werecommendthatthepower-lawmodelshouldnotbeusedforestimationofAGBinplantationsatdifferentgrowthstagesbecausepower-lawparameterscanbebiasedduetodatatruncation.