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在自然条件下对塔里木河流域主要建群树种胡杨 (PopuluseuphraticaOliv)、灰叶胡杨 (P .pruinosaSchrenk)的气体交换特性进行了比较研究。结果表明胡杨和灰叶胡杨光合速率 (Pn)日变化为单峰曲线 ,蒸腾速率 (E)和水分利用率 (WUE)为双峰曲线。胡杨日平均光合速率、蒸腾速率、水分利用率、气孔导度均高于灰叶胡杨 ,它属于高光合、高蒸腾、高水分利用型树种。胡杨和灰叶胡杨 (12 :0 0～ 14 :0 0 )Pn 的“午降”主要取决于气孔导度 ,而午后 (14 :0 0～ 2 0 :0 0 )的Pn 降低则主要取决于非气孔因素。Pn、E与环境因子相关分析表明 ,各因子作用大小依次为光照强度 (PPFD) >大气温度 (Tair) >大气相对湿度 (RH) >非环境因子 ,胡杨属光湿型而灰叶胡杨属光温型树种 ,它们在长期的适应环境过程中产生了不同的生理生态对策。
Abstract：The gas exchange characteristics of Populus euphratica and P.pruinosa of Tarim watersheld in n atural condition were studied.The result showed that diurnal courses of photosyn thesis rate(P n) of P.euphratica and P.pruinosa wer e single peak curve and tran spiration rate(E), water use efficiency(WUE) were double peak curve. Average P n,E,WUE of P.euphratica were higher than that of P.pruinosa,P.euphratica was belo ng to the tree species with high P n,high E ,high WUE.The Pn decline of P.pruinosa a and P.euphratica(12:00～14:00) was due to the effect of stomatal conductance(g s) and the low carboxylation capacity of the leaf mesophyII contributed to the Pn decline in the afternoon(14:00～20:00).Correlation analysis of P n ,E and e nvironmental factors showed that Photosynthetic photon flux density(PPFD) has th e strongest effect on P n ,E, second was air temperature, third was relative humidity ,fourth was stomatal conductance. P.pruinosa and P.euphratica have estab lished different ecological strategy to adapt the environment. This phenomenon r equires further study.
[1] 苏培,张立新,杜明武等.不同叶形胡杨光合特性与水分利用效率对CO2浓度升高的响应[J].植物生态学报.2003,27(1):34～40.
[2] 王世绩.全球胡杨资源的保护和恢复现状[J].世界林业研究,1996,(6):37～44.
[3] 李志军,刘建平,于军等.胡杨、灰叶胡杨生物生态学特性调查[J].西北植物学报,2003,23(7):1292～1296.
[4] 许大全.光合效率[M].上诲:科技推广,16,72.
[5] Berry,J .A ,W .J.S .Downton..Environmentalregulationofphotosynthesis.In:Govindjeeed.Photosynthesis,vol.Ⅱ..Develop ment,carbonmetabolismandplantproductivity.NewYork:AcademicPress.1982,263～343.
[6] Franks,J .G .D .Farquhar..Area;tionshipbetweenhumidityresponse,growthformandphotosyntheticoperatingpointinC3pla nts.Plant,CellandEnvironment,1999,1337～1349.
[7] Farquhar,G .D .Carbonisotopediscriminationandphotosynthesis.AnnualReviewofPlantphysiologyandplantMolecular.Biolo gy,1989,520～523.
[8] 邓雄,李小明,张希明等.4种荒漠植物气体交换特征的研究[J].植物生态学报,2002,26(5):605～612.
[9] 马焕成,王沙生,蒋湘宁.胡杨气体交换特性[J].西南林学院学报,1998,18(1):24～32.
基本信息:
中图分类号:Q945
引用信息:
[1]刘建平,韩路,龚卫江,周正立,李志军.胡杨、灰叶胡杨光合、蒸腾作用比较研究[J].塔里木农垦大学学报,2004(03):1-6.
基金信息:
塔里木农垦大学校长基金资助项目 (2 0 0 4-0 3 )
2004-09-30
2004-09-30