### 2.20.1.3. 14.1.3 Background Onset Growth[¶](#background-onset-growth "Permalink to this headline")

The stress-deciduous phenology algorithm includes a provision for the case when stress signals are absent, and the vegetation shifts from a deciduous habit to an evergreen habit, until the next occurrence of an offset stress trigger. In that case, the regular onset flux mechanism is switched off and a background onset growth algorithm is invoked (\\({r}\_{bgtr} > 0\\)). During this period, small fluxes of carbon and nitrogen from the storage pools into the associated transfer pools are calculated on each time step, and the entire contents of the transfer pool are added to the associated displayed growth pool on each time step. The carbon fluxes from transfer to display pools under these conditions are:

(2.20.20)[¶](#equation-20-20 "Permalink to this equation")\\\[CF\_{leaf\\\_ xfer,leaf} ={CS\_{leaf\\\_ xfer} \\mathord{\\left/ {\\vphantom {CS\_{leaf\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.21)[¶](#equation-20-21 "Permalink to this equation")\\\[CF\_{froot\\\_ xfer,froot} ={CS\_{froot\\\_ xfer} \\mathord{\\left/ {\\vphantom {CS\_{froot\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.22)[¶](#equation-20-22 "Permalink to this equation")\\\[CF\_{livestem\\\_ xfer,livestem} ={CS\_{livestem\\\_ xfer} \\mathord{\\left/ {\\vphantom {CS\_{livestem\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.23)[¶](#equation-20-23 "Permalink to this equation")\\\[CF\_{deadstem\\\_ xfer,deadstem} ={CS\_{deadstem\\\_ xfer} \\mathord{\\left/ {\\vphantom {CS\_{deadstem\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.24)[¶](#equation-20-24 "Permalink to this equation")\\\[CF\_{livecroot\\\_ xfer,livecroot} ={CS\_{livecroot\\\_ xfer} \\mathord{\\left/ {\\vphantom {CS\_{livecroot\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.25)[¶](#equation-20-25 "Permalink to this equation")\\\[CF\_{deadcroot\\\_ xfer,deadcroot} ={CS\_{deadcroot\\\_ xfer} \\mathord{\\left/ {\\vphantom {CS\_{deadcroot\\\_ xfer} \\Delta t}} \\right.} \\Delta t} ,\\\]

and the corresponding nitrogen fluxes are:

(2.20.26)[¶](#equation-20-26 "Permalink to this equation")\\\[NF\_{leaf\\\_ xfer,leaf} ={NS\_{leaf\\\_ xfer} \\mathord{\\left/ {\\vphantom {NS\_{leaf\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.27)[¶](#equation-20-27 "Permalink to this equation")\\\[NF\_{froot\\\_ xfer,froot} ={NS\_{froot\\\_ xfer} \\mathord{\\left/ {\\vphantom {NS\_{froot\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.28)[¶](#equation-20-28 "Permalink to this equation")\\\[NF\_{livestem\\\_ xfer,livestem} ={NS\_{livestem\\\_ xfer} \\mathord{\\left/ {\\vphantom {NS\_{livestem\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.29)[¶](#equation-20-29 "Permalink to this equation")\\\[NF\_{deadstem\\\_ xfer,deadstem} ={NS\_{deadstem\\\_ xfer} \\mathord{\\left/ {\\vphantom {NS\_{deadstem\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.30)[¶](#equation-20-30 "Permalink to this equation")\\\[NF\_{livecroot\\\_ xfer,livecroot} ={NS\_{livecroot\\\_ xfer} \\mathord{\\left/ {\\vphantom {NS\_{livecroot\\\_ xfer} \\Delta t}} \\right.} \\Delta t}\\\]

(2.20.31)[¶](#equation-20-31 "Permalink to this equation")\\\[NF\_{deadcroot\\\_ xfer,deadcroot} ={NS\_{deadcroot\\\_ xfer} \\mathord{\\left/ {\\vphantom {NS\_{deadcroot\\\_ xfer} \\Delta t}} \\right.} \\Delta t} .\\\]

