尾叶桉和邓恩桉的光合和蒸腾特性对光强的响应  

Response of Photosynthetic and Transpiration Characteristics of Eucalyptus urophylla and E.dunnii to Light Intensity

作　　者：刘建[1] 曾解放 项东云[3] 周坚[1] 

机构地区：[1]南京林业大学森林资源环境学院,江苏南京210037 [2]江西省永丰县林业产权交易中心,江西永丰331500 [3]广西林业科学研究院中南速生材繁育重点实验室,广西南宁530001

出　　处：《安徽农业科学》2007年第29期9152-9153,9156,共3页Journal of Anhui Agricultural Sciences

基　　金：中澳技术合作项目(ACIAR);广西林业科学研究院青年科技基金资助项目(2005f01)

摘　　要：[目的]探讨桉树的光合特性及其对环境光强变化的响应和适应性。[方法]设10个光照强度梯度:2 000、1 500、1 000、800、500、200、100、50、20和0μmol(/m2.s),利用LI-6400测定了尾叶桉(Eucalyptus urophylla)和邓恩桉(E.dunnii)幼苗的光合特性和蒸腾特性对光强的响应。[结果]尾叶桉和邓恩桉的光饱和点分别为1 500和1 000μmol/(m2.s),光补偿点分别为24.87和25.16μmol(/m2.s),表观量子效率分别为0.058 0和0.050 6,暗呼吸速率分别为1.44和1.27μmol(/m2.s)。两种桉树叶片Ci随光强的上升呈现出下降的趋势,气孔导度随光强的上升呈现出上升的趋势。水分利用率随光照强度增加呈抛物线状变化,光强在500μmol(/m2.s)以内时几乎呈直线上升并在500μmol/(m2.s)时达到最大值,然后随着光强的继续增强而出现了略有下降的趋势。[结论]该研究为桉树引种、速生丰产和制定栽培管理措施提供理论依据。[Objective] The purpose was to discuss the photosynthetic characteristics and its response and adaptability of eucalyptus to the change of environment light intensity. [Method] With 10 gradients of light intensity （2 000, 1 500, 1 000, 800, 500, 200, 100, 50, 20 and 0 mol/（m^2·s）, the response of photosynthetic characteristics and transpiration characteristics of Eucalyptus urophylla and E. dunnii to light intensity were measured by LI-6400 portable photosynthesis system. [Result] The light saturationpoints ofE. urophylla and E. dunnii were 1500 and 1000 mol/ （m^2·s） respectively, their light compensation points were 24.87 and 25.16 mol/（m^2·s） respectively, apparent quantum efficiency were 0.058 and 0.0506 respectively and dark respiration rates were 1.44 and 1.27 mol/（m^2 ·s） respectively. Ci in leaves of two kinds of eucalyptus were decreased along with the rising of light intensity, while the stomata conductance was increased along with the rising of light intensity. The water use efficiency changed as a parabola along with the rising of light intensity. The light intensity rise almost linearly within 500 mol/（m^2 ·s）, reached the maximum value at 500 mol/（m^2·s）, and then had slightly decreasing trend with the increasing of light intensity. [Conclusion] This study provided the theoretical basis for eucalyptus introduction, fast-growing, high-yield and establishing management measures.

关 键 词：光合特性 蒸腾特性 水分利用率 光响应曲线 

分 类 号：Q945.11[生物学—植物学]