Factors associated with the change of synthetic fertilizer N application rate and cropland area in upper, middle and lower reaches of the Yangtze River Basin.

<p>Factors associated with the change of synthetic fertilizer N application rate and cropland area in upper, middle and lower reaches of the Yangtze River Basin.</p

Factors associated with the change of synthetic fertilizer N application rate and cropland area in upper, middle and lower reaches of the Yangtze River Basin.

<p>Factors associated with the change of synthetic fertilizer N application rate and cropland area in upper, middle and lower reaches of the Yangtze River Basin.</p

Contributions of various parameters to variability of N budget of 2000.

<p>Contributions of various parameters to variability of N budget of 2000.</p

Relative contributions of cropland area and synthetic fertilizer N application rate to fertilizer N input during 2000–2010.

<p>Relative contributions of cropland area and synthetic fertilizer N application rate to fertilizer N input during 2000–2010.</p

Location of the Yangtze River Basin in China.

<p>Location of the Yangtze River Basin in China.</p

Spatial changes of NSI (a) and NUE (b) during 2000–2010 in the Yangtze River Basin.

<p>Spatial changes of NSI (a) and NUE (b) during 2000–2010 in the Yangtze River Basin.</p

Changes in NSI and NUE in the upper, middle and lower reaches of the Yangtze River Basin.

<p>Changes in NSI and NUE in the upper, middle and lower reaches of the Yangtze River Basin.</p

Estimated agricultural N inputs and outputs (Tg) in the Yangtze River Basin for 2000 and 2010.

<p>Estimated agricultural N inputs and outputs (Tg) in the Yangtze River Basin for 2000 and 2010.</p

Appendix B. Method for setting energy-related parameters in the model.

Method for setting energy-related parameters in the model

Appendix C. Method for setting the seasonal amount of straw dry matter returned to each hectare of rice paddy.

Method for setting the seasonal amount of straw dry matter returned to each hectare of rice paddy