首页 > 分享 > 石漠化区香樟不同叶龄光合特性及其主要环境因子的关系分析

石漠化区香樟不同叶龄光合特性及其主要环境因子的关系分析

花匠小妙招
2025-06-15 23:38

摘要: 为了探究石漠化区生物质能源树种香樟不同叶龄光合特性与其主要环境因子之间的关系,采用LI-6400便携式光合测试仪,分别测定6月、8月、10月贵州省凯里市石漠化区香樟叶片净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、胞间CO2浓度(Ci)等光合因子及光合有效辐射(PAR)、大气温度(Ta)、大气二氧化碳浓度(Ca)、空气相对湿度(RH)等环境因子,对不同叶龄光合日变化、光响应曲线进行了研究,进一步运用相关分析和通径分析,阐述了香樟不同叶龄Pn的显著性及其与光合因子和环境因子间的关系。结果表明:香樟不同叶龄Pn日变化曲线均呈单峰型;Pn表现为8月＞10月＞6月。香樟不同叶龄光饱和点(LSP)表现为8月＜10月＜6月,8月、10月均与6月差异显著;香樟不同叶龄光补偿点(LCP)表现为8月＜6月＜10月,10月、6月均与8月差异显著;香樟不同叶龄Pn主要受Tr、Ci和RH的影响,同时也受到其他光合因子与环境因子的共同影响。

Abstract: In order to explore the relationship between the photosynthetic characteristics of different leaf ages of Cinnamomum camphora, the biomass-energy tree species in rocky desertification areas and its main environmental factors, the photosynthetic factors such as net photosynthetic rate (Pn), stomatal conductivity (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci), and the environmental factors such as photosynthetically active radiation (PAR), atmospheric temperature (Ta), atmospheric carbon dioxide concentration (Ca) and relative humidity (RH) of Cinnamomum camphora leaves in the rocky desertification areas of Kaili City, Guizhou Province in June, August and October were measured by LI6400 portable photosynthesis tester. Then, the diurnal variation of photosynthesis and light response curves of different leaf ages were studied. The correlation analysis and path analysis were further used to explain the significance of Pn at different leaf ages and its relationship with photosynthetic factors and environmental factors. The results showed that the diurnal variation curves of Pn at different leaf ages of Cinnamomum camphora showed a single peak type. The Pn showed August > October > June. The light saturation point (LSP) of different leaf ages of Cinnamomum camphora showed that August < October < June, and the difference between August, October and June was significant. The light compensation point (LCP) of different leaf ages of Cinnamomum camphora showed that August < June < October, and the difference between October, June and August was significant. The Pn of different leaf ages of Cinnamomum camphora was mainly affected by Tr, Ci and RH, and was also affected by other photosynthetic factors and environmental factors.

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