全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

木荷幼苗对常绿阔叶林不同光环境的光合响应

, PP. 688-693

Keywords: 木荷,光环境,净光合速率,光能利用率,水分利用率,表观量子效率,光斑

Full-Text   Cite this paper   Add to My Lib

Abstract:

在夏季晴天,对生长在旷地、林窗和林下的木荷幼苗光合作用的日变化、光响应曲线及对短暂遮荫的响应等进行观测,结果表明: (1)旷地的日平均光合有效辐射约为1 230μmol?m-2 ?s-1 ,分别是林窗和林下的1. 7和12. 3倍左右,并且旷地的气温显著大于林窗和林下的,而空气相对湿度却明显低于其它2个光环境; ( 2)木荷幼苗在旷地和林窗均出现光合“午休”现象,旷地木荷“午休”时净光合速率的降幅约60% ,而林窗的降幅约为30%;旷地中木荷幼苗的最大净光合速率约为17. 8μmolCO2 ?m-2 ?s-1 ,约是林窗和林下的1. 8和3. 4倍;此外,木荷幼苗的光饱和点、光补偿点和暗呼吸速率均随环境光强的增大而增大; (3)短暂遮荫时,随着光合有效辐射的降低,各光环境中木荷幼苗的气孔导度和蒸腾速率不断降低,胞间CO2浓度逐渐升高,水分利用率在旷地和林窗中呈下降趋势,而在林下一定低光范围内(约130~800μmol?m-2?s-1 )则维持了较高水平; (4)受光斑照射时,光斑区域的光合有效辐射和净光合速率分别比受光斑前以及未受光斑区域提高了10倍和4倍以上。

References

[1]  Lowman M D,Nadkarni N M.Forest canopies[M].London:Academic Press,1995:78~689
[2]  Chazdon R L,Pearcy R,Lee D,et al.Photosynthetic responses of tropical forest plants to contrasting light environments[A].Mulkey S S,Chazdon R L,Smith A P,et al.Tropical forest plant ecophysiology[C].New York:Chapman and Hall,1996:5~55
[3]  Rozendaal D M A,Hurtado V H,Poorter L.Plasticity in leaf traits of 38 tropical tree species in response to light; relationships with light demand and adult stature[J].Functional Ecology,2006,20:207~216
[4]  冯玉龙,曹坤芳,冯志立,等.四种热带雨林树种幼苗比叶重、光合特性和暗呼吸对生长光强的适应[J].生态学报,2002,22(6):901~910
[5]  彭少麟,方炜.鼎湖山植被演替过程中椎栗和荷木种群的动态[J].植物生态学报,1995,19(4):311~318
[6]  张咏梅,周国逸,温达志,等.南亚热带季风常绿阔叶林锥栗-银荷木-黄果厚壳桂群落发展趋势探讨[J].植物生态学报,2003,27(2):256~262
[7]  周小勇,黄忠良,欧阳学军,等.鼎湖山季风常绿阔叶林原锥栗-厚壳桂-荷木群落演替[J].生态学报,2005,25(1):37~44
[8]  林植芳,林桂珠,孔国辉,等.生长光强和冬季低温对三种亚热带木本植物生理特性的影响[J].热带亚热带植物学报,1994,2(3):54~61
[9]  梁春,林植芳,孔国辉.不同光强下生长的亚热带树苗的光合-光响应特性的比较[J].应用生态学报,1997,8(1):7~11
[10]  温达志,孔国辉,林植芳,等.光强对四种亚热带树苗生长特征影响的比较[J].热带亚热带植物学报,1999,7(2):125~132
[11]  Scholes J D,Press M C,Zippeden S W.Differences in light energy utilization and dissipation between dipterocarp rain forest tree seedlings[J].Oecologia,1997,109:41~48
[12]  Kitao M,Lei T T,Koike T,et al.Susceptibility to photoinhibition of three deciduous broadleaf tree species with different successional traits raised under various light regimes[J].Plant,Cell and Environment,2000,23:81~89
[13]  Schurr U,Walter A,Rascher U.Functional dynamics of plant growth and photosynthesis from steady-state to dynamics-from homogeneity to heterogeneity[J].Plant,Cell and Environment,2006,29:340~352
[14]  Baroli I,Melis A.Photoinhibitory damage is modulated by the rate of photosynthesis and by the photosystem lI light-harvesting chlorophyll antenna size[J].Planta,1998,205:288~296
[15]  Krause G H,Koroleva O Y,Dalling J W,et al.Acclimation of tropical tree seedlings to excessive light in simulated tree-fall gaps[J].Plant,Cell and Environment,2001,24:1345~1352
[16]  郭志华,臧润国,奇文清,等.中亚热带两种原始兰科植物对变化光环境的响应与适应[J].林业科学,2003,39(3):23~29
[17]  周云龙.广州市流溪河森林公园植物区系的初步研究[J].热带亚热带植物学报,1994,2(2):31~40
[18]  郭志华,肖文发,周云龙.广州流溪河常绿阔叶林的植物区系地理分析[J].林业科学研究,2003,16(5):622~627
[19]  Thornley J H M.Mathematical models in plant physiology[M].London:Academic press,1976:85~106
[20]  Walker D A.Automated measurement of leaf photosynthetic O2 evolution as a function of photon flux density[J].Philosophical trascations of the Royal Society London B,1989,323:313~326
[21]  Field C,Merino I,Mooney H A.Compromises between water-use efficiency and nitrogen-use efficiency in five species of California evergreens[J].Oecologia,1983,60:384~389
[22]  郭志华,张宏达,李志安,等.鹅掌楸苗期光合特性的研究[J].生态学报,1999,19(2):164~169
[23]  Schulz K E,Adams M S.Effect of canopy gap light environment on evaporative load and stomatal conductance in the temperate forest understory herb Aster macrophyllus (Asteraceae)[J].American Journal of Botany,1995,82:630~637
[24]  Schulte M,Offer C,Hansen U.Induction of CO2-gas exchange and electron transport:comparion of dynamic and steady-responses in Fagus sylvatica leaves[J].Trees,2003,17:153~163
[25]  张小全,徐德应.18年生杉木不同部位和叶龄针叶光响应研究[J].植物生态学报,2000,24(5):534~540
[26]  Malavasi U C,Malavasi M M.Leaf characteristics and chlorophyll concentration of Schyzolobium parahybum and Hymenaea stibocarpa seedlings grown in different light regimes[J].Tree Physiology,2001,21:701~703
[27]  Park Y-II,Chow W S,Anderson J M,et al.Differential susceptibility of photosystem II to Light stress in light-acclimated pea leaves depends on the capacity for photochemical and non-radiative dissipation of light[J].Plant Science,1996,115:137~149

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133