摘要
对太湖梅梁湾水体实测结果表明 :在水体表面 ,UV -C的强度较小 ,只有 10 -5μE·m-2 ·s-1数量级 ;UV -B的强度随着波长的增加而呈现递增的趋势 ;UV -A的强度较强 ,达 10 -2 μE·m-2 ·s-1数量级 ,并且在水体中衰减较快 ,衰减系数 (Kd)可以达到 12 .5m-1。可见光在水体中Kd 可达 8.2m-1。在水下 0 .5m处 ,紫外线不足表面光强的 1% ,可见光是表面光强的 2 0 %左右。初级生产力在表面相对较小 ,在水下 0 .2m处最大 ,且随水深的增加而减少 ;在水体中直接测定发现 ,0 .2m处溶解氧值较高。初级生产力的这种分布是水体中紫外光与可见光共同作用的结果。
Distribution of light spectrum and primary production in the waterbody of Meiliang Inlet of Taihu Lake was studied. The results show that on the water surface, the intensity of UV-C was low (10 -5 μE·m -2 ·s -1 ), that of UV-B increased with wavelength and that of UV-A was much higher (10 -2 μE·m -2 ·s -1 ) but attenuated rapidly with maximum vertical diffuse attenuation coefficient ( K d )value up to 12.5 m -1 . K d of visible light could reach as high as 8.2 m -1 . In comparison with the value on the surface, the intensity of ultraviolet at 0.5 m was less than 1%, and of visible light around 20%. The primary production was relatively low in the surface, reached peak at the depth of 0.2 m and then decreased with the increase in depth. Direct measurement revealed that dissolved oxygen in the water was high at the depth of 0.2 m. Concentration of chlorophyll-a varied with light intensity in the water. These results show that the distribution of primary production was the result of the joint effect of ultraviolet and visible light.
出处
《农村生态环境》
CSSCI
CSCD
北大核心
2003年第2期24-28,共5页
Rural Eco-Environment
基金
中国科学院知识创新工程项目 (KZCX 2 -3 11)
关键词
水体
紫外光谱
可见光谱
初级生产力
waterbody
ultraviolet spectrum
visible light spectrum
primary production
