LDSF Topsoil Nitrogen
This map shows the distribution of predicted topsoil (0-20cm) total nitrogen (N). Total nitrogen is another key indicator for soil health. Although nitrogen is critical for plant productivity it is generally available to plants in its mineral forms, either ammonium or nitrate. Total nitrogen does not necessarily provide a direct correlation for the amount of plant available nitrogen but does indicate the potential pool. The concentration of total N is closely correlated to SOC and in this study the correlation was very strong (R2 0.95, P <0.001). The distribution of total N across LULC classes (Figure 18) followed that of organic C closely and there were significant differences between LULC classes (P<0.001) but no differences in either elevation or slope. Like SOC, Forest and Rock average total N concentrations for topsoil, 10.3 and 4.4 g kg-1 were significantly higher than any other LULC classes. Average concentrations for Agroforestry were 2.8 g kg-1, Cropland 1.8 g kg-1, Pasture 1.4 g kg-1 and Barren Land 1.4 g kg-1. These values are similar but generally higher to others reported for agricultural lands in Haiti which ranged from 1.18-1.36 g kg−1 (Isaac et al. 2004).
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