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1、不同積水處理下烏拉苔草蒸騰速率日變化及其與環(huán)境因子的關(guān)系第33卷第6期2005年11月東北林業(yè)大學(xué)JOURNALOFNORTHEASTFORESTRYUNIVERSITYVo1.33No.6Nov.2o05不同積水處理下烏拉苔草蒸騰速率日變化及其與環(huán)境因子的關(guān)系楊艷清徐惠風(fēng)金研銘劉興土(長春大學(xué),長春,130022)(吉林農(nóng)業(yè)大學(xué))(中國科學(xué)院東北地理與農(nóng)業(yè)生態(tài)研究所)摘要在相同的光照,相對濕度,溫度和風(fēng)速等自然環(huán)境下,對相同土壤條件下的烏拉苔草濕地進(jìn)行不同水分的處理,以桶(高50am,直徑40am)中水分為基準(zhǔn),設(shè)為滿水(
2、干1),半水(干2),干旱(干3)3個處理,以自然狀態(tài)下的土壤為對照.對烏拉苔草葉片的蒸騰速率,氣孔阻力,光合有效輻射,空氣溫度,葉片溫度,相對濕度,風(fēng)速及大氣中CO的體積分?jǐn)?shù)等指標(biāo)進(jìn)行了測定.結(jié)果表明:不同積水條件下,蒸騰速率的日變化與正弦曲線相似;氣孔阻力的日變化呈現(xiàn)單峰形變化,但峰值不同,干2峰值最小,不同處理的峰值出現(xiàn)的時間相同.從時間上看,氣孔阻力受水分的影響,與對照相比提前達(dá)到最大值.干l,干2,干3處理的蒸騰速率和氣孔阻力呈顯著的負(fù)相關(guān),風(fēng)速和蒸騰速率呈顯著的正相關(guān):干2,干3處理的光量子通量密度和大氣溫度呈顯
3、著的正相關(guān);干3處理的蒸騰速率和光量子通量密度呈顯著的正相關(guān).關(guān)鍵詞水分處理;烏拉苔草(Carexmeyeriana);蒸騰速率;日變化;環(huán)境因子分類號Q948.112DiurnalVariationofTranspirationRateofCarexmeyerianaandItsRelationshipwithEnvironmentalFactorstin.derDifferentWaterConditions/YangYanqing(ChangchunUniversity,Changchunl3o022,P.R.Chin
4、a):XuHuifeng,JinYanming(JilinAgricuhuralUniversity);LiuXingtu(NortheastInstituteofGeographyandAgriculturalEcolo—gY,ChineseAcademyofSciences)//JournalofNortheastForestryUniversity.一2O05,33(6).一52—54DifferentwatertreatmentswereconductedtoCarexmeyerianawetlandwithsimi
5、larsoilunderthesalnenaturalcondi.tionsoflight,relativehumidity,temperatureandwindspeed.Threetreatments,fuIIofwater(calledTlforshort),semi—fullofwater(T2),anddrought().weredesignedaccordingtothewatervolumeinabucket,andthewetlandundernaturalconditionwasusedascontro1.
6、rhetranspirationrate,stomatalresistance,temperatureofleavesofCarexmeyerianaaswellasphotosyntheticallyavailableradiation(PAR),airtemperature,relativehumidity,windspeed.atmosphericCO,concentrationweredetermined.Resultsshowedthatthediumalvariationoftranspirationrateso
7、fCarexmeyerianaunderdifferentwaterconditionsshowedaproximatesinusoid,andthediumalvariationofthestomatalresistancepresentedauni.modalcurve.Thepeakvalueswerenotequal,thatof12wasthelowest,whilethepeaksoccurredatthesametime.Watercontenthadacertaineffectonstomatalresist
8、ance.Thestomatalresistancereachedthemaximaaheadofthecontro1.Tran.spirafionratesofthesethreetreatmentsshowedasignificantlynegativecorrelationwiths