滇青冈幼苗的光合和生长对不同生长光强的适应

曹建新<sup>1; 2</sup>; 张光飞<sup>1</sup>; 张 磊<sup>1</sup>; 李秀华<sup>1</sup>; 苏文华<sup>1*</sup>

引用本文:	曹建新, 张光飞, 张磊, 李秀华, 苏文华.滇青冈幼苗的光合和生长对不同生长光强的适应[J].广西植物,2008,(1):126-129.[点击复制]
	CAO Jian-Xin, ZANG Guang-Fei, ZHANG Lei, LI Xiu-Hua, SU Wen-Hua.Acclimation of photosynthesis and growth to different growth light conditions for seedlings of Cyclobalanopsis glaucoides[J].Guihaia,2008,(1):126-129.[点击复制]

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滇青冈幼苗的光合和生长对不同生长光强的适应
曹建新^1,2, 张光飞¹, 张磊¹, 李秀华¹, 苏文华^1*
1.云南大学生态学与地植物学研究所, 昆明 650091;2.云南省林业科学院, 昆明 650204

摘要:

研究了3种光强(全日照的80%、20%和2%)下生长的滇青冈幼苗的光合-光强响应和生长状况。结果表明:3种光强生境滇青冈幼苗光饱和点和最大净光合速率没有显著差异,20%和2%生长光强下光补偿点显著低于80%生长光强。3种光强生境幼苗的光合饱和点在400～450 μmol·m^-2·s^-1左右,光补偿点也很低(6～10 μmol·m^-2·s^-1),表现出阴生植物的特征。但滇青冈幼苗较强的耐荫能力,是以牺牲生长为代价的。在2%的弱光生境中滇青冈幼苗比叶重显著降低,单位面积和单位干重叶绿素含量均显著增多,具有利用较强辐射的潜力,一旦林窗出现就可以利用增加的辐射提高光合速率,及时进入快速高生长。

关键词: 滇青冈光合适应

DOI：

分类号:Q945

基金项目:

Acclimation of photosynthesis and growth to different growth light conditions for seedlings of Cyclobalanopsis glaucoides

CAO Jian-Xin^1,2, ZANG Guang-Fei¹, ZHANG Lei¹, LI Xiu-Hua¹, SU Wen-Hua^1*

1.Institute of Ecology and Geobotany, Yunnan University, Kunming 650091, China;2.Yunnan Academy of Forestry, Kunming 650204, China 1.Institute of Ecology and Geobotany, Yunnan University, Kunming 650091, China; 2.Yunnan Academy of Forestry, Kunming 650204, China

Abstract:

The response of net photosynthetic rate(Pn)to photon flux density(PFD)and the growth condition for seedlings of Cyclobalanopsis glaucoides grown under three irradiance levels(80%,20% and 2% full-light)were examined in this paper. The results showed that,there was no significant differences of the light saturation point(LSP)and the Max. net photosynthetic rate among three irradiance levels,the light compensation point(LCP)in seedlings grown under 20% and 2% full-light were decreased significantly compared with 80%. The LSP were all about 400～450 μmol·m^-2·s^-1 and the LCP were bout 6～10 μmol·m^-2·s^-1 in seedlings grown in three light levels,exhibited a characteristic of shade plant. Seedlings of C.glaucoides had a strong ability of shade-tolerance,but this adaptability is at the cost of its'reduction of growth rate and dry mass accumulation. The leaf mass per unit area(LMA)decreased and the chlorophyll content increased significantly in seedlings grown under 2% full-light,showed a great capability to taking use of high irradiance,they could grow quickly when canopy formed.

Key words: Cyclobalanopsis glaucoides photosynthesis acclimation