The SOC and S are the two variables ordinarily used as
indicators of farmland soil quality, and they are also important
indicators of diffuse N loading. The horizontal
fitting lines for SOC
and S in the paddy rice sub-basins showed that they did not have a
strong influence. Because most diffuse N was in Org-N form, a
higher SOC in the soil improved the attachment of Org-N to soil
particles and decreased the transport chance. The spatial
correlations of the four metal indicators followed the same
pattern. The metal contents in paddy rice sub-basins was
negatively correlated with diffuse N loading, which meant that
the paddy rice sub-basins with higher metal contents had lower
loading risk. However, the situation in upland sub-basins was the
opposite. The completely contrary correlations meant that the
discharge principle was different in upland sub-basins with the
paddy rice sub-basins. In the upland sub-basins, the Org-N was
mainly absorbed by the soil and transported during rainfall events.
Under the aquatic condition of paddy rice sub-basins, the irrigation
accelerated the diffuse N discharge.
The SOC and S are the two variables ordinarily used asindicators of farmland soil quality, and they are also importantindicators of diffuse N loading. The horizontalfitting lines for SOCand S in the paddy rice sub-basins showed that they did not have astrong influence. Because most diffuse N was in Org-N form, ahigher SOC in the soil improved the attachment of Org-N to soilparticles and decreased the transport chance. The spatialcorrelations of the four metal indicators followed the samepattern. The metal contents in paddy rice sub-basins wasnegatively correlated with diffuse N loading, which meant thatthe paddy rice sub-basins with higher metal contents had lowerloading risk. However, the situation in upland sub-basins was theopposite. The completely contrary correlations meant that thedischarge principle was different in upland sub-basins with thepaddy rice sub-basins. In the upland sub-basins, the Org-N wasmainly absorbed by the soil and transported during rainfall events.Under the aquatic condition of paddy rice sub-basins, the irrigationaccelerated the diffuse N discharge.
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