### 2.10.2.5. Total Respiration[¶](#total-respiration "Permalink to this headline")

Following [Collatz et al. (1991)](https://escomp.github.io/ctsm-docs/versions/master/html/tech_note/References/CLM50_Tech_Note_References.html#collatzetal1991), the total respiration ( \\(R\_{\\mathrm{t}}\\)) is calculated in proportion to \\(V\_{\\text{c,max}}\\),

(2.10.17)[¶](#equation-10-17 "Permalink to this equation")\\\[R\_{\\mathrm{t}} = 0.015 V\_{\\text{c,max}}.\\\]

Accounting for the daytime and nighttime temperature, the daily respirations is calculated as follows,

(2.10.18)[¶](#equation-10-18 "Permalink to this equation")\\\[ R\_{\\text{td}}={R}\_{\\mathrm{t}} \[D\_{\\text{day}} + D\_{\\text{night}} f\_{\\mathrm{r}}{(T\_{\\text{night}})/f\_{\\mathrm{r}}{(T\_{\\text{day}})}}\],\\\]

where \\(D\_{\\text{day}}\\) and \\(D\_{\\text{night}}\\) are daytime and nighttime durations in seconds. \\(f\_{\\mathrm{r}}(T\_{\\text{night}})\\) and \\(f\_{\\mathrm{r}}(T\_{\\text{day}})\\) are the temperature response functions for respiration (see Appendix B in [Ali et al. (2016)](https://escomp.github.io/ctsm-docs/versions/master/html/tech_note/References/CLM50_Tech_Note_References.html#alietal2016) for details).

