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Supplemental Information

Supplementary Materials

Appendix 1 Description of obtaining the NFC in 1975 from 93 topographical maps

Appendix 2 Description of the field investigation for estimating the accuracy of natural forest distribution

Appendix 3 The sources of historical road network maps and road levels

Appendix 4 Description of the measure of four road-related indicators

Appendix 5 Comparing the predictive performances of four model techniques

Appendix 6 Overlaying the distribution of NFC with the road network in four pattern predictive performances of four model techniques

DOI: 10.7287/peerj.preprints.2884v1/supp-1

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Siliang Lin performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables.

Yaozhu Jiang performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables.

Jiekun He wrote the paper, prepared figures and/or tables.

Guangzhi Ma conceived and designed the experiments, reviewed drafts of the paper.

Yang Xu contributed reagents/materials/analysis tools.

Haisheng Jiang conceived and designed the experiments, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The raw data has been supplied as a supplementary file.

Funding

The authors received no funding for this work.


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