Tab . 6 Multi-scale relationship model of LULC type for water quality in different pollution source areas,,,,,,
Spatial scale,buffer,Water quality index,Regression equation,R2,Adjusted,Sig.
,,,,,R2,
urban,100m,COD,COD=80.589-1.562FarmL,0.881,0.841,0.018
,,TP,Variable removed,-,-,-
,,TN,Variable removed,-,-,-
,300m,COD,COD=96.942-1.453FarmL+0.712OthL,1,1,0
,,TP,Variable removed,-,-,-
,,TN,Variable removed,-,-,-
,500m,COD,COD=96.819-1.677FarmL,0.999,0.998,0
,,TP,Variable removed,-,-,-
,,TN,Variable removed,-,-,-
,700m,COD,COD=91.237-1.505FarmL,0.981,0.975,0.001
,,TP,TP=-1.657+0.088ISA,0.835,0.78,0.03
,,TN,Variable removed,-,-,-
,1000m,COD,COD=89.959-1.485FarmL,0.957,0.942,0.004
,,TP,Variable removed,-,-,-
,,TN,Variable removed,-,-,-
Phosphate mining area,100m,COD,COD=-0.201+10.676othL,0.744,0.712,0.001
,,TP,TP=1.372-0.029FarmL,0.604,0.554,0.08
,,TN,TN=3.089+1.167othL,0.413,0.34,0.45
,300m,COD,COD=-29.907+11.726othL+4.495Water,0.878,0.843,0.01
,,TP,TP=1.118-0.029FarmL+0.043othL,0.893,0.862,0
,,TN,TN=18.767-0.395FarmL,0.414,0.341,0.045
,500m,COD,COD=-29.745+11.223othL+5.198Water,0.86,0.82,0.001
,,TP,TP=0.844+0.065othL-0.021FarmL,0.99,0.987,0
,,TN,Variable removed,-,-,-
,700m,COD,COD=-2.252+8.166othL,0.663,0.621,0.04
,,TP,TP=-0.542+0.073othL+0.8ISA,0.997,0.996,0
,,TN,TN=-10.207+2.091ISA,0.568,0.514,0.012
,1000m,COD,COD=-10.61+12.501othL,0.685,0.646,0.003
,,TP,TP=-0.11+0.148othL,0.845,0.825,0
,,TN,TN=-19.188+3.269ISA,0.621,0.573,0.07
Village and farmland,100m,COD,Variable removed,-,-,-
,,TP,Variable removed,-,-,-
,,TN,TN=55.895-1.032FarmL,0.785,0.713,0.045
,300m,COD,Variable removed,-,-,-
,,TP,TP=2.515-0.057FarmL,0.794,0.725,0.042
,,TN,TN=79.528-1.863FarmL,0.953,0.937,0.004
,500m,COD,Variable removed,-,-,-
,,TP,TP=2.46-0.06FarmL,0.813,0.751,0.036
,,TN,TN=77.098-1.938FarmL,0.958,0.944,0.004
,700m,COD,Variable removed,-,-,-
,,TP,TP=2.638-0.067FarmL,0.87,0.827,0.021
,,TN,TN=81.143-2.11FarmL,0.98,0.973,0.001
,1000m,COD,Variable removed,-,-,-
,,TP,TP=2.768-0.073FarmL,0.854,0.805,0.025
,,TN,TN=85.869-2.319FarmL,0.977,0.969,0.001