| 水分梯度对沙地柏幼苗荧光特征和气体交换的影响 |
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| 引用本文： | 何维明,马风云. 水分梯度对沙地柏幼苗荧光特征和气体交换的影响[J]. 植物生态学报, 2000, 24(5): 630-634 |
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| 作者姓名： | 何维明 马风云 |
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| 作者单位： | 中国科学院植物研究所植被数量生态学开放研究实验室,北京 |
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| 基金项目： | 中国科学院资源与生态环境研究重大项目和重点项目!（KZ951－B1－108＆KZ952－S1－126） |
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| 摘 要： | 为了探讨未来降雨变化对半干旱毛乌素沙地常绿灌木沙地柏(Sabina valgaris Ant．)荧光特征和气体交换的影响，在内蒙古鄂尔多斯沙地草地生态站开展了水分梯度实验。结果表明：水分梯度对初始荧光、可变荧光、最大量子产量、最大荧光／初始荧光比的影响均不显著；相反，显著影响净光合比率、气孔导度、蒸腾速率、胞间CO2/大气CO2，水分利用效率、表观CO2利用效率和表观光能利用效率。这些结果指示，在一个实验期，土壤水分变化显著影响沙地柏幼苗的“表观性”气体交换和资源利用效率，并不显著影响光系统Ⅱ的“内在性”荧光特征。气体交换和资源利用效率对水分变化的响应格局因生理指标不同而存在差异。净光合速率对接近土壤最大持水量的施水处理最敏感。
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| 关 键 词： | 沙地柏幼苗 半干旱沙地 荧光特征 气体交 |
| 修稿时间： | ； |
EFFECTS OF WATER GRADIENT ON FLUORESCENCE CHARACTERISTICS AND GAS EXCHANGE IN SABINA VULGARIS SEEDLINGS |
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| HE Wei-Ming,MA Feng-Yun. EFFECTS OF WATER GRADIENT ON FLUORESCENCE CHARACTERISTICS AND GAS EXCHANGE IN SABINA VULGARIS SEEDLINGS[J]. Acta Phytoecologica Sinica, 2000, 24(5): 630-634 |
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| Authors: | HE Wei-Ming MA Feng-Yun |
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| Abstract: | To examine the effects of future rainfall change on the physiological characteristics of Sabina vulgaris, an evergreen shrub growing in the semi-arid Mu Us sandy region, a water gradient experiment was conducted at the Ordos Grassland Ecological Station in Inner Mongolia. The results showed: minimal fluorescence(F0), variable fluorescence(Fv), Fm/F0, Fv/Fm were not significantly affected by the water gradient, while in contrast, net photosynthesis ratio, stomatal conductance, transpiration rate, ratio of substomatal CO2 to atmospheric CO2, water use efficiency, apparent light use efficiency and apparent CO2 use efficiency were all influenced significantly by changing water status. These results indicate that while the water gradient has a significant effect on external features, such as gas exchange and resource use efficiency, it has no significant influence on the internal fluorescence features of photosynthesis system . The patterns of the responses of the gas exchange and resource use efficiency to water change varied with various physiological indices. Net photosynthesis rate responded most sensitively to soil water content relative to soil field capacity. |
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| Keywords: | Sabina vulgaris seedlings Semi-arid sandy region Chlorophyll fluorescence Gas exchange Resource use efficiency |
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