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. 2017 Jul 26;7:6628. doi: 10.1038/s41598-017-07056-4

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Spatiotemporal changes in the lengths of the sowing-emergence (a), emergence-squaring (b), squaring-flowering (c), flowering-boll opening (d), and boll opening-harvest (e) periods and the whole growing period (f) of cotton across the North China Plain from 1981 to 2012. Green and red circles represent the trends of the lengths of phenological periods. Black pentagrams represent the trends at the stations, with a significance level of 0.05. Maps were generated using ArcGIS 10.1 (ESRI Inc, Redlands, CA, USA, http://www.esri.com/).