4个观赏树种对紫外线屏蔽效应的研究

4 Ornamental Tree Species Screening Effects to Ultraviolet

应用地表植被光谱仪测定紫薇、山茱萸、柳叶栎、北美红栎4个观赏树种的光谱日变化特征。结果表明:各树种对太阳总辐射屏蔽效率的日变化呈"增加"的趋势,对UVA辐射、UVB辐射屏蔽效率的日变化呈"增加—降低"的趋势。80%以上的太阳总辐射、UVA辐射、UVB辐射都被屏蔽,4个树种具有良好的屏蔽紫外线辐射的功能;紫薇对太阳总辐射、UVA辐射、UVB辐射屏蔽效率都最高。

Spectrum diurnal variations of Lagerstroemia indica, Comus officeinalis, Quercus phellos, Quercus rubra were measured by using SpectroSense. Diurnal variations of four species screening effects to total solar radiation showed the increasing trend, while screening effects to UVA and UVB showed increasing-decreasing trends. They could screen more than 80 percents of total solar radiation, UVA and UVB. The four species had good function of screening to ultraviolet, Lagerstroemia indica had the highest screening effects to total solar radiation, UVA and UVB.