. 2018 Nov 7;9:1593. doi: 10.3389/fpls.2018.01593

Table 1.

Drought effects on biomass, ¹³C tracer uptake, root respiration and biomass N contents.

Labeling	Parameter	Unit	Control	Drought	D ^a
Peak drought	Total biomass	g_dm m^-2	313 ± 23	353 ± 31	n.s.
	Shoot biomass	g_dm m^-2	131 ± 12	82 ± 9	^∗∗∗
	Root biomass	g_dm m^-2	182 ± 16	271 ± 25	^∗∗
	Root:Shoot ratio	–	1.45 ± 0.21	3.44 ± 0.37	^∗∗∗
	¹³C uptake	mg_13C m^-2	366 ± 32	93 ± 6	^∗∗∗
	Root respiration	μmol_CO2 m^-2 s^-1	0.82 ± 0.03	0.88 ± 0.09	n.s.
	Shoot N	g_N m^-2	1.71 ± 0.16	1.14 ± 0.13	^∗∗
	Root N	g_N m^-2	1.41 ± 0.10	2.35 ± 0.30	^∗∗∗
	Total N	g_N m^-2	3.12 ± 0.22	3.49 ± 0.38	n.s.
Recovery	Total biomass	g_dm m^-2	295 ± 19	267 ± 12	n.s.
	Shoot biomass	g_dm m^-2	114 ± 8	102 ± 7	n.s.
	Root biomass	g_dm m^-2	181 ± 20	165 ± 8	n.s.
	Root:Shoot ratio	–	1.7 ± 0.3	1.6 ± 0.1	n.s.
	¹³C uptake	mg_13C m^-2	220 ± 29	231 ± 27	n.s.
	Root respiration	μmol_CO2 m^-2 s^-1	0.81 ± 0.06	0.94 ± 0.11	n.s.
	Shoot N	g_N m^-2	1.34 ± 0.09	1.74 ± 0.19	^∗∗
	Root N	g_N m^-2	1.46 ± 0.19	1.59 ± 0.03	n.s.
	Total N	g_N m^-2	2.80 ± 0.23	3.33 ± 0.19	^∗

^aLevels of significance for drought effects: ^∗∗∗P_aovp < 0.001, ^∗∗P_aovp < 0.01, ^∗P_aovp < 0.05, ^(∗)P_aovp < 0.1; n.s., not significant. Mean values ± SE (n = 6) are shown for control and drought treatments. For root respiration and N concentrations, the data were averaged over the four sampling times for each mesocosm.