摘要
三峡水库＂冬蓄夏排＂的反季节水位调度管理方式,使得三峡库区在每年的6—9月份处于145m低水位状态运行,与最高蓄水位175m相差30m。自7月份开始进入高温天气以来,三峡库区暴雨洪水增多,水位变化频率加快。在此过程中,库岸带植物因水位上升出现短期水淹,又因接踵而来的放水调节至低水位暴露于夏季高温中而出现短时间干旱,由此形成水淹-干旱交替胁迫现象,这将很可能打乱库岸带植物的生理节律,影响这些库岸植物的光合作用与生长发育。
To select suitable tree species for riparian revegetation in the Three Gorges Reservoir Area,three different kinds of water treatment simulating the riparian soil water changes were applied,including control（CK）,continuous flooding（CF）,and periodic flooding-drought（PF）.Photosynthesis,biomass,growth and other related physio-ecological characteristics of Pinus elliottii seedlings were examined in this research.Results showed that water treatment could significantly influence photosynthesis,biomass and growth of P.elliottii seedlings.Net photosynthetic rate（Pn） and stomatal conductance（Gs） in CF and PF were significantly lower than those in CK,with a significant higher intercellular carbon dioxide concentration（Ci） in the two treatments than in CK.With extension of the treatment duration,there was a continuous increase in total biomass,root biomass,stem biomass,leaf biomass,plant height and base diameter of both CF and PF.In terms of the overall average value throughout the experimental period,no significant difference was found in total biomass,root biomass,stem biomass,plant height and base diameter between CF and PF;however,the parameters in both CF and PF were significantly lower than that of CK.The results verified that P.elliottii seedling was capable to tolerate water and drought stresses,and could be a candidate species for establishing riparian shelterbelt in the Three Gorges Reservoir Area.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第12期158-164,共7页
Scientia Silvae Sinicae
基金
国家林业公益性行业科研专项(201004039)
留学回国人员科研启动基金[教外司留(2010-1561)]
重庆市自然科学基金项目(CSTC-2010BB7003)
中央高校基本科研业务费专项资金重点项目(XDJK2009B032)
国家林业局948项目(2008-4-45)
关键词
水分胁迫
湿地松幼苗
光合特征
生长特征
三峡库区
water stress
Pinus elliottii seedlings
photosynthesis
growth characteristics
the Three Gorges Reservoir Area
