马占相思的日光合作用和日碳固定总量研究(英文)

被引：17

作者：

余华

Bee Lian ONG

机构：

[1] 南京大学国际地球系统科学研究所

[2] 新加坡国立大学生物系南京

[3] 新加坡

来源：

植物生态学报 | 2003年 / 05期

关键词：

马占相思; 叶绿素荧光; 气体交换; 光合作用; 日碳固定总量;

D O I：

暂无

中图分类号：

Q945 [植物生理学];

学科分类号：

0903 ;

摘要：

马占相思(Acacia mangium)是一种具有较高经济价值和生态效益的热带速生树种。为了研究其光合作用对一天内光强、温度等环境因子变化的响应,揭示其迅速生长的生理生态机制,在叶片水平上测量了马占相思在24h内的净光合速率(Pn)、蒸腾速率、气孔导度(Gs)、胞间CO2浓度(Gi)、每日固定碳的总量、夜间消耗碳的总量以及日问光合系统Ⅱ光化学效率(Fv/Fm)的变化。结果显示:其净光合速率在正午降低了14.5％;其较高的蒸腾速率和气孔导度有助于保持叶片日间较高的碳固定速率;光合系统Ⅱ对于高光强和高温有较强的忍受度;每日固定碳的总量为502 mmol CO2·m-2,夜间碳的损失为54 mmol CO2·m-2。研究结果在一定程度上揭示了马占相思在热带高光强和高温条件下迅速生长的生理机制。

引用

页码：624 / 630

页数：7

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