Fig 1.
The geographical location of the Bosten Lake basin in Northwest China.
Fig 2.
The research framework and method used the NDR module of the InVEST Model.
Table 1.
Areas and percentages of land use types in 2000, 2005, 2010 and 2015.
Fig 3.
Changes in lake level and lake area of Bosten Lake during 2000–2015.
Fig 4.
The annual average precipitation of the whole Bosten Lake basin between 2000 and 2015.
Fig 5.
The precipitation of the Bosten Lake basin in 2000(a), 2005(b), 2010(c), 2015(d).
Fig 6.
The nitrogen and phosphorus export of cultivated land, grassland and built-up areas in 2000, 2005, 2010 and 2015.
Fig 7.
The nitrogen and phosphorus exports for different precipitation intervals in the Bosten Lake basin.
Table 2.
The nitrogen and phosphorus exports in 2000, 2005, 2010 and 2015.
Fig 8.
Spatial distribution of the variation in export of nitrogen in the Bosten Lake basin in 2000-2015(a), 2000-2005(b), 2005-2010(c), and 2010-2015(d).
(The positive value with 1(blue) indicates the increase in nitrogen export, the negative value with -1(red) indicates the decrease in nitrogen export, and the zero (green) indicates no variation in nitrogen export).
Fig 9.
Spatial distribution of the variation in export of phosphorus in the Bosten Lake basin in 2000-2015(a), 2000-2005(b), 2005-2010(c), and 2010-2015(d).
(The positive value with 1(blue) indicates the increase in phosphorus export, the negative value with -1(red) indicates the decrease in phosphorus export, and the zero (green) indicates no variation in phosphorus export).
Fig 10.
Input source (blue text) and flow direction (red arrow) of nitrogen and phosphorus in the Bosten Lake basin.