3.3. Spatial pattern of diffuse N loading
The spatial distributions of the mean annual diffuse N loading
were shown in three forms (Org-N, NO3-N, and TN) (Fig. 4). The
mean loadings of Org-N and NO3–N were 12.05 and 0.26 kg/ha/y,
respectively. The Org-N was the main form of diffuse N loading
(12.31 kg/ha/y). The loading of NO3–N was much lower and mainly
originated from the upland sub-basins. The forest and wetland
sub-basins contributed to some N pollution, but the largest average
loading was less than 8.4 kg/ha/y. Based on the land use
distribution, nearly 95% of the diffuse N pollution was found to
come from the upland and paddy rice sub-basins. So, the spatial
relationships of diffuse N loading with soil properties were focused
on the sub-basins where farmland was dominant.
3.3. Spatial pattern of diffuse N loadingThe spatial distributions of the mean annual diffuse N loadingwere shown in three forms (Org-N, NO3-N, and TN) (Fig. 4). Themean loadings of Org-N and NO3–N were 12.05 and 0.26 kg/ha/y,respectively. The Org-N was the main form of diffuse N loading(12.31 kg/ha/y). The loading of NO3–N was much lower and mainlyoriginated from the upland sub-basins. The forest and wetlandsub-basins contributed to some N pollution, but the largest averageloading was less than 8.4 kg/ha/y. Based on the land usedistribution, nearly 95% of the diffuse N pollution was found tocome from the upland and paddy rice sub-basins. So, the spatialrelationships of diffuse N loading with soil properties were focusedon the sub-basins where farmland was dominant.
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