科研成果
| 论文编号: | |
| 第一作者所在部门: | 生态研究中心 |
| 论文题目: | Effects of water stress and nitrogen supply on leaf gas exchange and fluorescence parameters of Sophora davidii seedlings |
| 作者: | 吴福忠 |
| 全部作者: | F.Z. WU,W.K. BAO,F.L. LI, N. WU |
| 论文出处: | |
| 刊物名称: | PHOTOSYNTHETICA |
| 年: | 2008 |
| 卷: | 46 |
| 期: | 1 |
| 页: | 40-48 |
| 联系作者: | 包维楷 |
| 收录类别: | |
| 影响因子: | 1 |
| 摘要 : | Two-month-old seedlings of Sophora davidii were subjected to a randomized complete block design with three water(80, 40, and 20 % of water field capacity, i.e. FC80, FC40, and FC20) and three N supply [N0: 0, Nl: 92 and Nh: 184 mg(N)kg–1(soil)] regimes. Water stress produced decreased leaf area (LA) and photosynthetic pigment contents, inhibited photosynthetic efficiency, and induced photodamage in photosystem 2 (PS2), but increased specific leaf area (SLA). The decreased net photosynthetic rate (PN) under medium water stress (FC40) compared to control (FC80) might result from stomatal limitations, but the decreased PN under severe water deficit (FC20) might be attributed to non-stomatal limitations.On the other hand, N supply could improve photosynthetic capacity by increasing LA and photosynthetic pigment contents, and enhancing photosynthetic efficiency under water deficit. Moreover, N supply did a little in alleviating photodamages to PS2 caused by water stress. Hence water stress was the primary limitation in photosynthetic processes of S. davidii seedlings, while the photosynthetic characters of seedlings exhibited positive responses to N supply. Appropriate N supply is recommended to improve photosynthetic efficiency and alleviate photodamage under water stress. |
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