% the following cannot be processed by bookdown, even when they are commented. tex file cannot be produced. It can be compiled by texstudio successfully.

\addsymbol{~}{~}
\addsymbol{{\bf Symbols}}{~}
\addsymbol{$Q_{\text A}$}{available energy flux, W\,m$^{-2}$}
\addsymbol{$a_1, a_2, ..., a_n$}{model coefficients (general)}
\addsymbol{$Bo$}{Bowen ratio}
\addsymbol{$c_\text {p}$}{specific heat of air, J\,kg$^{-1}$\,K$^{-1}$}
\addsymbol{$D$}{vapour pressure deficit, hPa}
\addsymbol{$Q_{\text E}$}{latent heat flux, W\,m$^{-2}$}
\addsymbol{$E_{\text {eq}}$}{equilibrium evapotranspiration, W\,m$^{-2}$}
\addsymbol{$E_\text 0$}{ temperature sensitivity of Lloyd-Taylor function, K}
\addsymbol{$e_\text {s}$}{saturated vapour pressure, hPa}
\addsymbol{$f$}{function (general)}
\addsymbol{$Q_{\text G}$}{ground heat flux, W\,m$^{-2}$}
\addsymbol{$g_\text {s}$}{surface conductance, mm\,s$^{-1}$}
\addsymbol{$Q_{\text H}$}{sensible heat flux, W\,m$^{-2}$}
\addsymbol{$k$}{light distinct coefficient}
\addsymbol{$L$}{Obukhov length, m}
\addsymbol{$R$}{correlation coefficient}
\addsymbol{$R^2$}{coefficient of determination}
\addsymbol{$R_\text{eco}$}{ecosystem respiratory efflux}
\addsymbol{$R_\text{ref}$}{ecosystem respiratory efflux at a reference temperature}
\addsymbol{$R_\text {g}$}{global radiation,\,W\,m$^{-2}$}
\addsymbol{$R_\text {n}$}{net radiation,\,W\,m$^{-2}$}
\addsymbol{$r_\text {a}$}{aerodynamic resistance, s\,mm$^{-1}$}
%\addsymbol{$r_\text {b}$}{boundary-layer resistance, s\,mm$^{-1}$}
\addsymbol{$r_\text {s}$}{surface resistance, s\,mm$^{-1}$}
\addsymbol{$s_\text {c}$}{temperature dependence of specific humidity at saturation,  kg\,kg$^{-1}$\,K$^{-1}$}
\addsymbol{$T$}{temperature (general),  $^{\circ}$C}
\addsymbol{$u$}{wind speed,  m\,s$^{-1}$}
\addsymbol{$u*$}{friction velocity, m\,s$^{-1}$}
\addsymbol{$x$}{fetch, m}
\addsymbol{$X$}{day after planting/transplanting}
\addsymbol{$z$}{measurement height minus displacement height, m}
\addsymbol{$\alpha$}{initial slope of Michaelis-Menten function, $\mu$mol\,s$^{-1 }$\,W$^{-1}$}
\addsymbol{$\alpha_\text {PT}$}{Priestley-Taylor coefficient}
\addsymbol{$\alpha'$}{initial slope of leaf-light response function, $\mu$mol\,s$^{-1 }$\,W$^{-1}$}
\addsymbol{$\beta$}{saturated carbon dioxide uptake rate, $\mu$mol\,m$^{-2 }$\,s$^{-1}$}
\addsymbol{$\beta'$}{specific saturated carbon dioxide uptake rate, $\mu$mol\,m$^{-2 }$\,s$^{-1}$}
\addsymbol{$\gamma$}{psychrometeric constant,  hPa\,K$^{-1}$}
\addsymbol{$\kappa$}{Von-K\'arm\'an constant}
\addsymbol{$\rho$}{air density,  kg\,m$^{-3}$}
\addsymbol{$\zeta$}{stability parameter}
