JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2000, Vol. 24 ›› Issue (01): 17-22.doi: 10.3969/j.jssn.1000-2006.2000.01.005

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TheAnalysisoftheIrrigationEffectanditsCharacterinYoung PlantationofPopulustomentosa

WangWenquan JiaYubin LiHuizhuo ZhangZhenjiang WangRong GaoZengmin (HebeiAgriculturalUniversity Baoding 0 710 0 0 )   

  1. HebeiDamingCountyForestryBureau
  • Online:2000-02-18 Published:2000-02-18

Abstract: Accordingtotheanalysisof8 yearsuccessivedataofirrigationonPopulustomentosaplantation ,itsef fectandcharacterwerestudiedsystematiclly.Theresultsshowthattheleaf’scontentsofchlorophyllandnutrition elementsandthepotentialofphotosynthesiswereincreasedsignificantlybyirrigating,andthetreemaintainedthe highervitalityforgrowth ,whiletheystimulatedthedormancybuds,expandedtheareaofleaf,andincreasedthethick ofthetreetruckandthelengthofitsbranchesaswell.Thecomprehensiveness,differentials ,changeableandcontinu alreactioninlaterstagewerethecharactersoftreesresponsetoirrigation.theeffectsoftreeforirrigationincluded physiologicalreaction ,growth ,reproductionandlaterstagereproduction ,andthekeyforitwastheincreasedfoliage continually .Duringtheirrigationgperiod ,theeffectofirrigationincreasedasthesoilmoistureirrigationthreshold wasraised .Butwithoutirrigationoflateryears,themiddlesoilmoisturethresholdtreatmentwasthebesttotree growth .Duringthedryseason(ApriltoJune) ,theirrigationcouldincreasethetotalfoliageareamorethan 3to 4 times,andthenetgrowthofD .B .H .andheightoftreemorethan 30 %and40 %respectively.Inthelater4-years withoutirrigation ,thevolumeofthetreewasraisedby 39.67%inaverage ,thatirrigatedwith 50 %offieldcapacity asthesoilmoisturethresholdinearly 4 -years.

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