Erratum to: Environ Monit Assess (January 2016) 188, Issue 1:66

DOI 10.1007/s10661-015-5075-4

The original version of this article unfortunately contained an error and omitted two foundations.

The name of the first author should have been Bing-Qi Zhu not Binq-Qi Zhu. The corrected author name is shown above.

Two foundations should have been included into the acknowledgment section. They are given below.

The study was also funded by the National Natural Science Foundations of China (grant nos. 41225001 and 41271049).