Correlation between (a) aboveground net primary productivity (ANPP) and mean annual precipitation (MAP) and that separately between (b) precipitation-use efficiency (PUE) and MAP and also soil water storage (SWS) at various soil depths at the 101 soil water observation sites in the Loess Plateau grassland.

<p>Correlation between (a) aboveground net primary productivity (ANPP) and mean annual precipitation (MAP) and that separately between (b) precipitation-use efficiency (PUE) and MAP and also soil water storage (SWS) at various soil depths at the 101 soil water observation sites in the Loess Plateau grassland.