Data sources used for assignment and validation of the model.

<p>Note: specific settings of the model are shown in Table A in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0135572#pone.0135572.s005" target="_blank">S5 Text</a>.</p><p>Data sources used for assignment and validation of the model.</p

Flow diagram of the NPS pollution subsystem.

<p>Flow diagram of the NPS pollution subsystem.</p

Land use in Wulijie in 2010.

<p>Note: ^aOther land for construction includes urban and rural residential land, roads, railways, land for public facilities, <i>etc</i>.</p><p>^b Other land for non-construction includes water, woodland, grassland, <i>etc</i>.</p><p>Land use in Wulijie in 2010.</p

Conceptual model of the land use-NPS pollution system.

<p>Note: “+” and “–” represent positive and negative feedbacks.</p

Flow diagram of the land use subsystem.

<p>Flow diagram of the land use subsystem.</p