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Table 3 Mean nitrogen density (Mg ha−1 of N) and total nitrogen stocks (Mg of N) by LULC class at the watershed scale

From: The relevance of using in situ carbon and nitrogen data and satellite images to assess aboveground carbon and nitrogen stocks for supporting national REDD + programmes in Africa

LULC/LUCa Descriptive statistic
Range of nitrogen density (Mg ha−1 N) Mean nitrogen density (Mg ha−1N) (SE) Total nitrogen stocks (Mg N) (SE)
Min Max
Forest land 740.37 ± 0.021
 Riparian forest and woodland 0.170 0.285 0.212 (0.014) 72.41 ± 0.014
 Savannah Woodland 0.045 0.160 0.096 (0.005) 530.79 ± 0.005
 Shrub Savannah 0.008 0.064 0.032 (0.001) 137.16 ± 0.001
Grassland 0.825 ± 0.0006
 Savannah grassland 0.0001 0.0178 0.0085 (0.0068) 0.825 ± 0.0.0006
Cropland 62.57 ± 0.0006
 Cropland and Fallow 0.00018 0.0252 0.0077 (0.0067) 62.57 ± 0.0006
Settlements 5.20 ± 0.002
 Settlements 0.0017 0.0201 0.0106 (0.0021) 5.20 ± 0.002
Agroforestry 1.53 ± 0.022
 Cashew plantation 0.017 0.340 0.0741 (0.022) 1.53 ± 0.022
Plantation 5.01 ± 0323
 Eucalyptus grandis 0.012 1.091 0.321 (0.088) 4.42 ± 0.088
 Tectona grandis 0.058 0.418 0.291 (0.115) 0.26 ± 0.115
 Azadirachta indica 0.114 0.425 0.317 (0.101) 0.23 ± 0.101
 Gmelina arborea 0.024 0.079 0.058 (0.017) 0.10 ± 0.017
  1. The age of plantations and agroforestry system varied from 5 to 45 years which explained the large standard error (SE) and the large variance relative to the mean obtained from their plots data. The area of each LULC class was provided in the Table 1