摘要
以光下无遮挡处为对照(光照强度1719μmol·m^(-2)·s^(-1)),对马尾松(Pinus massoniana Lamb.)林缘(光照强度859μmol·m^(-2)·s^(-1))和林内(光照强度181μmol·m^(-2)·s^(-1))10年生油茶(Camellia oleifera Abel)的叶片和光合特征进行研究,对3种林下光环境中气温、空气水汽压亏缺和光合有效辐射的日变化进行比较,并对油茶叶片和光合特征指标与上述3个主要环境因子的相关性进行分析。结果表明:林缘油茶叶片的面积、周长、厚度、比叶面积、气孔密度和叶绿素含量均最高,且基本上显著(P<0.05)高于林内和对照,但气孔面积却显著低于林内和对照。在光合有效辐射为300~1800μmol·m^(-2)·s^(-1)时,林缘油茶叶片的净光合速率也明显高于林内和对照。供试3种林下光环境中,油茶叶片的最大净光合速率、表观量子效率、光饱和点和暗呼吸速率均在林缘最高、在林内最低,而光补偿点则在对照最高、在林内最低,且这5个指标在不同林下光环境间差异显著。从油菜叶片光合参数的日变化看,林内油茶叶片的净光合速率、气孔导度、蒸腾速率和水分利用效率在多数时刻最低,且3种林下光环境中这些指标的日变化趋势各异;3种林下光环境中油茶叶片胞间CO_(2)浓度和气孔限制值在不同时刻无明显规律,且其日变化趋势恰好相反。3种林下光环境中气温、空气水汽压亏缺和光合有效辐射的日变化总体上表现为先升高后降低的趋势。相关性分析结果表明:油茶叶片净光合速率、蒸腾速率和气孔限制值与3个主要环境因子均呈显著或极显著正相关,其胞间CO_(2)浓度和水分利用效率基本上与3个主要环境因子呈显著或极显著负相关,另外,比叶面积和气孔面积与光合有效辐射呈极显著正相关。综上所述,马尾松林缘油茶的叶片生长较好且光合能力较强。
Taking the place without shelter under light as the control(illumination intensity of 1719μmol·m^(-2)·s^(-1)),leaf and photosynthetic characteristics of 10-year-old Camellia oleifera Abel in forest edge(illumination intensity of 859μmol·m^(-2)·s^(-1))and forest inside(illumination intensity of 181μmol·m^(-2)·s^(-1))of Pinus massoniana Lamb.were studied,and the diurnal variations of air temperature,air vapor pressure deficit,and photosynthetically active radiation in three understory light environments were compared,meanwhile the correlations of leaf and photosynthetic characteristic indexes of C.oleifera with above three major environmental factors were analyzed.The results show that area,circumference,thickness,specific leaf area,stomatal density,and chlorophyll content in leaf of C.oleifera in forest edge are all the highest,and are basically significantly(P<0.05)higher than those in forest inside and the control,but stomatal area is significantly lower than that in forest inside and the control.At the photosynthetically active radiation of 300-1800μmol·m^(-2)·s^(-1),net photosynthetic rate of leaf of C.oleifera in forest edge is also evidently higher than that in forest inside and the control.In three test understory light environments,maximum net photosynthetic rate,apparent quantum yield,light saturation point,and dark respiration rate of leaf of C.oleifera are all the highest in forest edge,but the lowest in forest inside,while light compensation point is the highest in the control,but the lowest in forest inside,and these five indexes are significantly different among different understory light environments.From the diurnal variations of photosynthetic parameters of leaf of C.oleifera,net photosynthetic rate,stomatal conductance,transpiration rate,and water use efficiency of leaf of C.oleifera in forest inside are the lowest at most times,and the diurnal variation tendencies of these indexes in three understory light environments are different;intercellular CO_(2)concentration and stomatal limi
作者
张亚琴
郭其强
罗丝琼
盘金文
姚珊
郭有燕
ZHANG Yaqin;GUO Qiqiang;LUO Siqiong;PAN Jinwen;YAO Shan;GUO Youyan(Research Center for Forest Resources and Environment of Guizhou,College of Forestry,Guizhou University,Guiyang 550025,China;Research Academy of Rural Revitalization,Hexi College,Zhangye 734000,China)
出处
《植物资源与环境学报》
CAS
CSCD
北大核心
2022年第6期25-33,共9页
Journal of Plant Resources and Environment
基金
贵州省科学技术厅平台人才项目([2018]5261)。
关键词
油茶
林下光环境
叶片特征
光合特征
环境因子
相关性分析
Camellia oleifera Abel
understory light environment
leaf characteristics
photosynthetic characteristics
environmental factor
correlation analysis
