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Supplemental Information

Supplemental Information 1

DOI: 10.7287/peerj.preprints.153v1/supp-1

Supplemental Information 2

DOI: 10.7287/peerj.preprints.153v1/supp-2

Supplemental Information 3

DOI: 10.7287/peerj.preprints.153v1/supp-3

Supplemental Information 4

DOI: 10.7287/peerj.preprints.153v1/supp-4

Supplemental Information 5

DOI: 10.7287/peerj.preprints.153v1/supp-5

Supplemental Information 6

DOI: 10.7287/peerj.preprints.153v1/supp-6

Supplemental Information 7

DOI: 10.7287/peerj.preprints.153v1/supp-7

Additional Information

Competing Interests

Jianhua Xu is an Academic Editor for PeerJ.

Author Contributions

Qin Nie conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper.

Jianhua Xu conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools.


This work was supported by National Natural Science Foundation of China (Grant No. 41130525, 41040015), and the Director Fund of the Key Lab of GIScience of the Education Ministry PRC. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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