摘要
一年中茶树叶片的净光合速率有2个低谷，分别出现在1和4月份（分别为2．50和4．02μmol·m－2·s－1）；有2个高峰，第1个出现在3月份（5．91μmol·m－2·s－1），第2个出现在6和8月份（分别为8．75和8．23μmol·m－2·s－1）．全年中5～8月份净光合速率均维持在较高水平．茶树光合年变化受生理生态因子的影响，特别是主导因子的影响．多元统计分析、主成分分析和通径分析表明，光合有效辐射、叶温和气温是茶园生态系统的主导因子（此三者第1主成分的特征向量分别为0．4467、0．4335和0．4356；P光合有效福射→Y＝1．1543，P气温→Y＝－1．0808，P气温→光合有效辐射→Y＝1．0653，P叶温→光合有效辐射→Y＝1．0685）．生理因子中气孔导度对茶树叶片的净光合速率影响最大（气孔导度第1主成分的特征向县为—0．4464，P气孔导度→Y＝－0．3723）．
There are two valleys in the annual variation of net photosynthetic rate (Pn) of tea, which appeared in January and April, respectively (Pn was 2.50 and 4.02 μmol·m-2·s-1), and two peaks, the first of which was in March (Pn was 5.91 μmol·m-2·s-1), the second was in June and August (Pn was 8.75 and 8.23 μmol·m-2·s-1, respectively). Pn remains at high level from May to August. The Pn fluctuation of tea was mainly affected by ecophysiological factors, especally the dominant factors. Analysis (with multiple linear regression, path coefficient, principal components) results showed that photosynthetic active radiation (PAR),leaf temperature (Tl), air temperature (Ta) were the dominant factors in tea field ecosystem (Their first principal component eigenvectors were 0. 4467, 0. 4335, 0. 4356; PPAR→Y=1.1543, PTa→Y=-1. 0808, PTa→PAR→Y=1.0653, PTl→PAR→Y=1.0685). Stomatal conductance was the dominant physiological factor [stomatal conductance (Gs) first principal component eigenvector was-0.4464, PGs→Y=-0.3723].
出处
《福建农业大学学报》
CSCD
1999年第1期38-42,共5页
Journal of Fujian Agricultural University
关键词
茶树
光合作用
年变化
tea
photosynthesis
annual variation
