| 喀斯特露石生境下构树和桑树的光合特征 |
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| 引用本文： | 李环,吴沿友,吴沿胜.喀斯特露石生境下构树和桑树的光合特征[J].中国岩溶,2021,40(3):487-494. |
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| 作者姓名： | 李环 吴沿友 吴沿胜 |
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| 作者单位： | 1.中国科学院地球化学研究所/环境地球化学国家重点实验室/中国科学院大学地球与行星科学学院 |
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| 基金项目： | 贵州省自然科学基金（黔科合基础[2018]1175）；国家重点研发计划项目(2016YFC0502602)；国家自然科学基金 (U1612441) |
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| 摘 要： | 以喀斯特适生植物构树（Broussonetia papyrifera）为研究对象，非喀斯特适生植物桑树（Morus alba）为对照，比较了不同的植物光合作用对露石生境的响应。与无露石生境相比，多露石生境土壤具有较高的水分含量和较多的有机质。分析植物光合作用的光响应曲线和二氧化碳响应曲线、叶绿素荧光参数以及叶片水势（LWP）和碳稳定同位素值（δ13C）的结果表明:不同生境下，两种植物的LWP及δ13C无显著变化；除了初始荧光参数外，同种植物的叶绿素荧光参数差异不显著；不同生境下，构树的呼吸速率和羧化效率无显著变化，而多露石生境土壤生长的桑树的呼吸速率和羧化效率明显要大于无露石生境土壤生长的；在水分亏缺下，构树以牺牲体内碳的方式来维持稳定的羧化效率，进而保持稳定的光合能力；构树比桑树对喀斯特环境有着较强的适应性。
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| 关 键 词： | 喀斯特 裸露岩石 构树 桑树 光合作用 |
Photosynthetic characteristics of Broussonetia papyrifera and Morus alba under rock outcrop habitat in karst area |
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| LI Huan,WU Yanyou,WU Yansheng.Photosynthetic characteristics of Broussonetia papyrifera and Morus alba under rock outcrop habitat in karst area[J].Carsologica Sinica,2021,40(3):487-494. |
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| Authors: | LI Huan WU Yanyou WU Yansheng |
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| Institution: | 1.State Key Laboratory of Environmental Geochemistry， Institute of Geochemistry， Chinese Academy of Sciences/College of Earth and Planetary Sciences，University of Chinese Academy of Sciences2.State Key Laboratory of Environmental Geochemistry， Institute of Geochemistry， Chinese Academy of Sciences |
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| Abstract: | Taking the karst-adaptable plant species， Broussonetia papyrifera as the target， and the non-karst-adaptable plant （Morus alba） as the contrast， this study compared photosynthetic responses of different plant species to rock outcrop habits. Research suggests that the soil in a rock outcrop habit has higher water content and more organic matter than that in a non-rock outcrop habit. The light response curve and carbon dioxide response curve of photosynthesis， chlorophyll fluorescence parameters， water potential （LWP） and carbon stable isotope values （δ13C） of leaves were measured. Results show that there is no significant difference in LWP and δ13C between different habitats in the two plant species， while there exists a significant difference in chlorophyll fluorescence parameters of the same plant species except for the initial fluorescence parameter （F0）. The respiration rate and carboxylation efficiency （CE） of Broussonetia papyrifera do not change significantly in different habitats， while that of Morus alba growing in the soil of rock outcrop habit are significantly higher than those growing in the soil of non-rock outcrop habit. Broussonetia papyrifera can maintain stable CE at the expense of carbon in the plant， thus maintaining stable photosynthetic capacity under water deficit of a non-rock outcrop habit. The karst-adaptable plant species， Broussonetia papyrifera， is more adaptable to the karst environment than Morus alba. |
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