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N flow in FASSET

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N flow in FASSET Powered By Docstoc
					 Simulation of effects of soils, climate
and management on N2O emission from
              grasslands


  Dmitri Chatskikha, Jørgen E. Olesena,
  Jørgen Berntsena, Kristiina Reginab &
           Sirwan Yamulkic
      Dmitri.Chatskikh@agrsci.dk
         N flow in FASSET
                            Animal products

 Feed
 Feed
bought
bought




                             NH33,, N22O
                             NH N O




 Crops                       Deposition
                             Deposition
 Crops
  sold                       Fixation
                             Fixation
  sold
                             Fertiliser
                             Fertiliser



                            NO33
                            NO
Simulated mean N2O emission factors as % of N input at low (200 kg N ha-1) and high (400 kg N ha-1)
mineral N application rates for the Foulum climate

  Soil type       Cut (% of applied        Grazed (% of applied         Grazed (% of total
                         N)                        N)                          N)


                  Low          High          Low           High          Low         High


 Coarse
                  0.41          0.55          0.95          1.24         0.46         0.75
 sand


 Loamy
                  0.68          1.03          1.75          2.47         0.80         1.46
 sand


 Sandy
                  1.42          2.43          3.53          5.03         1.65         2.99
 loam
Table 4. Observed and simulated N2O emissions (kg N ha-1)



    Site            Experiment             Period           Observed   Simulated
Jægersborg             UN            May-Jul 1981             0.43       0.11
                       UN            Jul-Aug 1981             0.24       0.24
                       MI            May-Jul 1981             1.32       1.16
                       MI            Jul-Aug 1981             1.06       2.39
                       SL            May-Jul 1981             1.65       1.23
                       SL            Jul-Aug 1981             7.70       5.48
Jokioinen              CL            May-Dec 2000             0.46       4.07
                       CL            Jan -Dec 2001            0.96       3.17
                       CL            Jan -Aug 2002            1.33       2.38
                       LS            Jul-Dec 2000             0.49       0.51
                       LS            Jan-Dec 2001             1.51       1.02
                       LS            Jan - Aug 2002           0.82       0.71
Taw Green              CF            Feb-Nov 2002             5.97       6.14
                       OF            Feb-Nov 2002             2.42       1.83

				
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