欧洲杨、榛子、短叶松和黑云杉气体交换的日变化(英文)

被引:6
作者
杨丽涛
TimothyJ
Arkebauer
ElizebethA
Walter-Shea
机构
[1] 广西大学农学系!南宁
[2] DepartmentofAgronomy!UniversityofNebraska
[3] Lincoln
[4] NE-
[5] USA
[6] DepartmentofAgriculturalMeteorology!UniversityofNebraska
[7] DepartmentofA
关键词
气体交换; 日变化; 净二氧化碳同化率; 气孔导度; 光合作用光通量; 气温; 蒸气压差; 欧洲杨; 榛子; 短叶松; 黑云杉;
D O I
暂无
中图分类号
Q948.11 [植物与非生物环境];
学科分类号
摘要
对欧洲杨 (Populus tremuloides Michx.)和榛子 (Corylus cornuta Marsh.)的叶片 ,短叶松 (Pinus banksianaL amb.)和黑云杉 (Picea mariana(Mill) BSP)树枝气体交换日变化的特性进行了试验研究 ,以便于了解在北部气候条件下叶对环境变化的适应机理。气体交换采用便携式气体交换系统定时从早晨到下午进行测定。在阳光充足的晴天 ,欧洲杨和榛子叶片的日净二氧化碳同化率 (Pn)和气孔导度 (gs)的高峰出现在 10∶ 0 0左右 ,其值分别为欧洲杨 16 .9μmol· m- 2· s- 1和 0 .32 m ol· m- 2· s- 1 ,榛子 16 .4μmol· m- 2· s- 1和 0 .42 mol·m- 2· s- 1。而短叶松和黑云杉 3个不同年龄树枝的 Pn 和 gs的高峰出现在早晨 7∶ 0 0到 8∶ 0 0 ,其值分别是短叶松一年龄树枝为 7.5 μmol·m- 2· s- 1和 0 .11mol· m- 2· s- 1 ,黑云杉一年龄树枝 6 .1μmol· m- 2· s- 1和 0 .11mol· m- 2· s- 1。在阴天 ,并且当光合作用光通量 (PPFD)达到 5 0 0 μm ol· m- 2·s- 1时 ,短叶松和黑云杉的最高的 Pn 出现在上午的中段时间。在所有的天气条件下 ,日最高 gs出现的时间早于日最高 Pn。所观察到的 gs的变化与叶片 /树枝与大气之间的蒸气压差 (VPD)和气温 (Ta)的变化关系最为密切。早晨的高 gs与低 VPD和低 Ta
引用
收藏
页码:408 / 419
页数:12
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