中文摘要：

通过测定不同地表硬化下银杏（Ginkgobiloba）的净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、水分利用效率（WUE）、叶片相对含水量（RWC）等生理生态特性的季节变化以及光合有效辐射（PAR）、空气温度（rra）、空气相对湿度（RH）、二氧化碳含量（CO2）、叶面水汽压亏缺（Vpdl）等环境指标的季节变化，采用决策分析，探讨了地表硬化对银杏光合作用和蒸腾作用的胁迫因子。结果表明随着地表硬化程度的加重，银杏的Pn、Tr、Gs、WUE和RWC也相应的降低；6—8月份是地表硬化对银杏胁迫最为严重的月份；地表硬化对环境最大的影响是空气温度（Ta）；地表硬化对银杏的主要胁迫因子是温度（Ta）和叶面水汽压亏缺（Vpdl）。

英文摘要：

The net photosynthetic rate （Pn）, transpiration rate （T r）, stomatal conductance（Gs）, water use efficiency （WUE）, leaf relative water content （RWC）, seasonal variations of physiological and ecological characteristics, and environmental factors such as photosynthetic active radiation （PAR）, air temperature （Ta）, relative humidity（RH）, carbon dioxide （CO2）, and leaf vapor pressure deficit （Vpdl） were measured to explore the effect of impervious surface on the stress of photosynthesis and transpiration in Ginkgo biloba through the use of decision coefficient analysis. The results indicated that with the increase of soil sealing, the Pn,Tr, Gs,WUE and RWC of Ginkgo biloba decreased accordingly. The most serious stress of impervious surface to the Ginkgo biloba occurred from June to August. The greatest impact of impervious surface on the environment was the air temperature. The major stress factors to the Ginkgo biloba due to impervious surface were Ta and Vpdl.