Abstract: In order to understand the pollution status of heavy metals in the sediments of Shaying River, we acquired the surface sediments and determined the concentrations of 7 heavy metals (As, Cd, Cr, Cu, Hg, Pb, and Zn) in May 2013. The results showed that the average contents of As, Cd, Cr, Cu, Hg, Pb, and Zn were 8.49, 0.35, 51.4, 27.2, 0.094, 26.8, and 111.8 mg·kg^-1. Average contents of Cd, Cu, Hg, Pb, and Zn elements were higher than the background values in soils of Henan Province. These five heavy metals were influenced by human activities at varying levels. The heavy metal contamination in sediments estimated by geo-accumulation index (I_geo) followed the order: Cd>Hg>Zn>Pb>Cu>Cr>As. The pollution of Cd was the most serious, and 91.43% of the samples were contaminated by Cd. The result of potential ecological risk index showed that the ecological risk of the heavy metals was: Cd>Hg>As>Cu>Pb>Zn>Cr. Cd showed a very strong risk, Hg was  of strong risk, and the other 5 kinds were of low risk. The heavy metals pollution of Zhoukou section of Yinghe River and its tributaries Jialu River and Qingyi River were prominent, which should arouse the attention of the local environmental protection departments.

Key words: tomato, sub-low temperature, drought, photosynthetic characteristics, distribution of energy and electron flow.