Figure 1

Map of the YYB and sampling locations. It is based on the digital elevation model (DEM) with a ground resolution of 90 m, which was obtained from the NASA SRTM (http://srtm.csi.cgiar.org/)"

Figure 2

The annual average (a) pH, (b) TH, and (c) TDS values of waters in the YYB during 2009-2014. YZYC, KMC, CC, BJC, PMYC, KLXR, YJR, PZR, XDR, QQR, KDJR, and GMLR are short for Lake Yamzhog Yum Co, Kongmu Co, Chen Co, Bajiu Co, Puma Yum Co, Kaluxiong River, Yajian River, Puzong River, Xiangda River, Quqing River, Kadongjia River, and Gamalin River, respectively"

Figure 3

The Piper diagrams of the major ion concentrations and hydrochemical types of waters in the YYB, showing (a) the current status (2009-2014) and the variations from 1984 in lake waters and (b) the current status (2009-2014) in river waters. Data in 1984 is after Chen (1990). YZYC, PMYC, CC, BJC, KMC, KLXR, YJR, PZR, XDR, QQR, KDJR, and GMLR are short for Lake Yamzhog Yum Co, Puma Yum Co, Chen Co, Bajiu Co, Kongmu Co, Kaluxiong River, Yajian River, Puzong River, Xiangda River, Quqing River, Kadongjia River, and Gamalin River, respectively"

Figure 4

The spatial distribution of (a) MD values and the molar concentration percentage of (b) (Na++K+), (c) Mg2+, and (d) Ca2+ in the surface water of Lake Yamzhog Yum Co"

Figure 5

The vertical changes in major ions, MD, and pH values of waters in Lake Yamzhog Yum Co in 1979 and 2009-2014. Data in 1979 is after Guan et al. (1984)"

Figure 6

Gibbs diagram of TDS values versus the weight ratio of Na+/(Na++Ca2+) and Cl-/(Cl-+HCO3-), indicating the mechanisms controlling the hydrochemistry of main lake and river waters in the YYB"

Figure 7

Scatter diagrams of (a) (Cl-+SO42-) vs. HCO3-, (b) (HCO3-+SO42-) vs. (Ca2++Mg2+), (c) HCO3- vs. (Ca2++Mg2+), (d) (Na++K+) vs. (Ca2++Mg2+), (e) SO42- vs. Na+, and (f) Cl- vs. Na+ for river waters in the YYB"