Attenuation of UVR and PAR in a clear and deep lake: Spatial distribution and affecting factors
文献类型：期刊论文
| 作者 | Zhang, Manxue; Zhou, Yongqiang; Zhang, Yibo; Shi, Kun; Jiang, Cuiling; Zhang, Yunlin |
| 刊名 | LIMNOLOGICA
 |
| 出版日期 | 2020 |
| 卷号 | 84 |
| 英文摘要 | Light attenuation is considered as a sentinel for environmental change in lakes and has a profound influence on aquatic ecosystems. However, the spatial distribution of ultraviolet radiation (UVR) and photosynthetically active radiation (PAR) attenuation, and the underlying mechanisms are still not fully understood. We carried out a field investigation with 60 sampling sites covering the entire Lake Qiandaohu from November 29 to December 1, 2013, during the weak stratification period to elucidate the spatial pattern and driving mechanisms. The diffuse attenuation coefficient of UVB (K d (313)), UVA (K-d(340)) and PAR (K-d(PAR)) varied from 1.48 to 4.63 m(-1), 1.09 to 3.43 m(-1), and 0.26 to 0.94 m(-1), respectively. The corresponding ranges for the 1% attenuation depths were from 0.10 to 3.11 m, 1.34-4.21 m and 4.87-17.58 m, respectively. Total suspended matter (TSM) concentration was highly significantly correlated with K-d(313), K-d(340) and K-d (PAR) indicating that TSM was the main driver of UVR and PAR attenuation in Lake Qiandaohu in the late autumn and early winter. TSM concentration, K-d(313), K-d(340) and K-d(PAR) had obvious horizontal spatial heterogeneity presenting a decreasing trend from the estuary area to the center area in the lake. These results suggested that the spatial distribution of TSM from the inflow drived the spatial distribution of UVR and PAR attenuation. Significantly positive correlations were also observed between the chromophoric dissolved organic matter (CDOM) absorption coefficient and K-d(313). TSM and CDOM absorption spectra showed that in the UVR waveband (350-400 nm), the mean relative contribution rates of CDOM (a(g)(lambda)) , non-algal particles (a(nap)(lambda)), phytoplankton (a(ph)(lambda)) and pure water (a(w)(lambda)) to the total absorption were 67.5 %, 24.0 %, 5.0 % and 3.5 %, respectively. In the PAR waveband, the mean relative contribution rates of a(g)(lambda), a(nap)(lambda), a(ph)(lambda) and a(w)(lambda) to the total absorption were 25.4 %, 18.6 %, 9.4 % and 46.6 %, respectively. Our findings could provide support for ecological environment protection in Lake Qiandaohu considering the importance of UVR and PAR attenuation in aquatic ecosystems. |
| 源URL | [http://159.226.73.51/handle/332005/19890]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Zhang, Manxue,Zhou, Yongqiang,Zhang, Yibo,et al. Attenuation of UVR and PAR in a clear and deep lake: Spatial distribution and affecting factors[J]. LIMNOLOGICA,2020,84. |
| APA | Zhang, Manxue,Zhou, Yongqiang,Zhang, Yibo,Shi, Kun,Jiang, Cuiling,&Zhang, Yunlin.(2020).Attenuation of UVR and PAR in a clear and deep lake: Spatial distribution and affecting factors.LIMNOLOGICA,84. |
| MLA | Zhang, Manxue,et al."Attenuation of UVR and PAR in a clear and deep lake: Spatial distribution and affecting factors".LIMNOLOGICA 84(2020). |
入库方式： OAI收割
来源：南京地理与湖泊研究所
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