摘要
选取塔里木河下游3处地下水埋深>6m的监测井位作为研究点,结合典型生态监测断面的地下水位监测数据,分析不同地下水埋深处柽柳的叶绿素荧光特性和光系统的光合活性.结果表明:随着地下水埋深加大和干旱胁迫加剧,柽柳叶片的实际光化学效率、电子传输速率和光化学猝灭等参数普遍下降;非光化学猝灭和调节性能量耗散量子产量等参数显著升高,而最大光量子产量总体处于相对适宜状态.干旱胁迫下柽柳的PSII光合活性随地下水埋深增大而下降,捕获光能的过剩程度加剧,发生光抑制的几率增大,其自身良好的抗旱性和自我调节机制,使光系统II尚未发生显著光损伤.
Based on the monitoring data of groundwater level at the typical sections in lower reaches of Tarim River,three survey plots nearby the ecological monitoring wells with groundwater depths 6 m were selected to investigate the chlorophyll fluorescence characteristics of Tamarix hispida and its photosynthetic activity of PSII under effects of different groundwater depths.With increasing groundwater depth,the chlorophyll fluorescence parameters such as actual photochemical efficiency of PSⅡ in the light （Φ_PSII）,electron transport rate （ETR）,and photochemistry quenching （q_P） of T.hispida decreased,while the non-photochemistry quenching （q_N,NPQ） and the yield for dissipation by down-regulation （Y_NPQ） increased remarkably,and the maximal photochemical efficiency of PSII （F_v/F_m） maintained an optimum value.All the results suggested that the PSII photosynthetic activity of T.hispida under drought stress declined with increasing groundwater depth,and the greater excess energy could result in more risk of photo-inhibition.However,the good adaptability and drought tolerance of T.hispida could make its PSII not seriously damaged,though the drought stress actually existed.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第7期1689-1696,共8页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(40871059)
国家"十一五"科技支撑计划项目(2006BAC01A03-1)
"西部之光"人才培养计划项目(XBBS200804)资助
关键词
叶绿素荧光
地下水位
荧光猝灭
光化学效率
塔里木河
chlorophyll fluorescence
groundwater level
fluorescence quenching
photochemical efficiency
Tarim River
