巨尾桉在岩溶石山生境中的适应性研究（Ⅰ）：春季光合生理生态学特性

陈婷1; $21; 2*; $21; 2

引用本文:	陈婷1，马姜明1，2*，梁士楚1，2.巨尾桉在岩溶石山生境中的适应性研究（Ⅰ）：春季光合生理生态学特性[J].广西植物,2012,(2):185-191.[点击复制]
	CHEN Ting1， MA Jiang Ming1，2*， LIANG Shi Chu1，2.Study on the adaptability of Eucalyptus grandis× E.urophylla in karst hills(Ⅰ):photosynthetic physiological ecology characteristics in spring[J].Guihaia,2012,(2):185-191.[点击复制]

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巨尾桉在岩溶石山生境中的适应性研究（Ⅰ）：春季光合生理生态学特性
陈婷1，马姜明1，2*，梁士楚1，2
1.广西师范大学生命科学学院，广西桂林 541004;2.广西师范大学珍稀濒危动植物生态与环境保护省部共建教育部重点实验室，广西桂林 541004

摘要:

以岩溶石山生境的3年生巨尾桉人工林为研究对象，采用LI 6400型便携式光合仪测定巨尾桉在春季的叶片净光合速率（Pn）及其他生理生态因子日变化，同时测定巨尾桉光合-光响应曲线，并通过相关分析和通径分析探讨净光合速率与其他生理生态因子的关系。结果表明：巨尾桉光合-光响应曲线符合Walker的非直线双曲线模型。巨尾桉的光饱和点为1 340 μmol•m 2•s 1，光补偿点为14.68 μmol•m 2•s 1，表观量子效率（AQY）为0.06mol•mol 1，具有阳生植物的特点。净光合速率日变化呈现“单峰型”的特点。蒸腾速率（Tr）、气孔导度（Gs）和大气CO2浓度（Ca）是影响巨尾桉叶片净光合速率日变化的重要因子。巨尾桉有较高的水分利用效率，说明巨尾桉具有适应岩溶石山干旱的特征或避旱策略。

关键词: 巨尾桉光合作用日变化通径分析光曲线岩溶石山

DOI：

分类号:Q945.11

基金项目:

Study on the adaptability of Eucalyptus grandis× E.urophylla in karst hills(Ⅰ):photosynthetic physiological ecology characteristics in spring

CHEN Ting1， MA JiangMing1，2*， LIANG ShiChu1，2

1.College of Lfe Sciences， Guangxi Normal University， Guilin 541004， China;2.Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University)， Ministry of Education， Guilin 541004， China 1.College of Lfe Sciences， Guangxi Normal University， Guilin 541004， China； 2.Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University)
， Ministry of Education， Guilin 541004， China

Abstract:

Diurnal changes of net photosynthetic rate(Pn)，other physiological and ecological factors，and photosynthesis and photo response curve of E.grandis×E.urophylla were measured with the LI 6400 photosynthesis system in spring in karst hills. The relationship between Pn and other physiological and ecological factors were analyzed using correlation analysis and path analysis. The results showed that the photosynthesis and photo response curve of E.grandis×E.urophylla were complied with the Walker’Nonlinear Hyperbolic Model. The 1ight saturation point(LSP)and 1ight compensation point(LCP)of E.grandis×E.urophylla were 1 340 μmol•m 2•s 1 and 14.68 μmol•m 2•s 1 respectively，which conformed the characteristic of heliophyte. The apparent quantum yield (AQY) was 006 mol•mol 1.The diurnal change of Pn of E.grandis×E.urophylla was a “single peak” curve. Transpiration rate(Tr)，stomatal conductance(Gs)and atmospheric CO2 concentration(Ca)were the main factors influencing the Pn of E.grandis×E.urophylla. That the high water use efficiency(WUE)of E.grandis×E.urophylla indicated that E.grandis×E.urophylla had the characteristic being suitable to the karst hills or the tactics avoiding drought.

Key words: Eucalyptus grandis×E.urophylla photosynthesis diurnal change path analysis light curve karst hills