摘要
以尾叶桉(Eucalyptus urophylla)无性系幼苗为供试材料,通过2因素3水平控制土壤水分和养分,测定了不同水肥处理下18个月生尾叶桉的叶绿素荧光特性,结果表明:水肥胁迫对叶绿素荧光参数影响显著;土壤含水量越低或养分含量越高,尾叶桉幼苗的初始荧光(F_o)、最大荧光(F_m)、PSⅡ的非环式电子传递的量子效率(Φ_(PSⅡ))、PSⅡ最大光化学效率(F_v/F_m)、光化学猝灭系数(qP)和电子传递量子产量(ETR)参数值就越高;尾叶桉幼苗的非光化学猝灭系数值随土壤含水量增加呈现升高趋势,说明尾叶桉幼苗能通过热耗散消耗过剩光能,避免光合机构受到破坏;尾叶桉在不同水肥处理下实际光化学效率(Φ_(PSⅡ))值较低,非化学猝灭系数(NPQ)较高,说明尾叶桉吸收的光能主要用于热耗散,表观电子传递速率较高表明尾叶桉属于较高光呼吸的植物。
The chlorophyll fluorescent characteristics of Eucalyptus urophylla seedlings under different water and nutrient treatment by 2 factors and 3 levels experiment in this paper were analyzed. The result shows that fluorescence parameters of the E. urophylla seedling were significantly affected by the water and nutrient stresses. When the soil water content was lower or the nutrient content was higher, the initial fluorescence（F_o）, maximal fluorescence（F_m）, quantum efficiency of noncyclic electron transfer of PS Ⅱ（Φ_（PSⅡ））, PS Ⅱphotochemical efficiency（F_v/F_m）, photochemical quenching coefficient（qP） and electron transport quantum yield（ETR） parameter value were higher. The non-photochemical quenching coefficient of E. urophylla seedlings showed a significantly increasing trend with the soil water content was higher, which suggested that of E. urophylla seedlings could be consumed by thermal dissipation of excess light energy to avoid damage from the photosynthetic mechanism. The actual photochemical efficiency（Φ_（PSⅡ）） of E. urophylla was lower, and the nonphotochemical quenching coefficient（NPQ） was higher, which suggested that the light energy absorbed by E. urophylla was mainly used for heat dissipation. The apparent electron transport rate was higher, indicating that E. urophylla belongs to higher light breathing plants.
作者
杨会肖
廖焕琴
杨晓慧
徐放
潘文
张卫华
YANG Huixiao;LIAO Huanqin;YANG Xiaohui;XU Fang;PAN Wen;ZHANG Weihua(Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization/Guangdong Academy of Forestr)
出处
《林业与环境科学》
2018年第3期1-5,共5页
Forestry and Environmental Science
基金
广东省科技计划项目(2016B070701008)
广东省林业科技创新项目(2016KJCX002)资助
关键词
尾叶桉
水分胁迫
养分胁迫
叶绿素荧光
Eucalyptus urophylla
water stress
nutrient stress
chlorophyll fluorescence parameters
