diff --git a/SW_Output.c b/SW_Output.c
index 00cd6ee64..b4976e736 100644
--- a/SW_Output.c
+++ b/SW_Output.c
@@ -1353,11 +1353,11 @@ void get_co2effects(void) {
 		  month = (SW_Model.month) - tOffset;
 		  grass = SW_VegProd.grass.CO2_biomass[month];
 		  shrub = SW_VegProd.shrub.CO2_biomass[month];
-		  tree = SW_VegProd.tree.CO2_biomass[month];
+		  tree = SW_VegProd.tree.CO2_pct_live[month];  // Only pct live is affected
 		  forb = SW_VegProd.forb.CO2_biomass[month];
 		  BIO_mult = c->co2_biomass_mult;
 		  WUE_mult = c->co2_wue_mult;
-		  total = grass + shrub + tree + forb;
+		  total = grass + shrub + forb;
 		  
 			#ifdef RSOILWAT
 				p_Rco2effects_mo[SW_Output[eSW_CO2Effects].mo_row + mo_nrow * 0] = SW_Model.year;
@@ -1382,14 +1382,14 @@ void get_co2effects(void) {
   	  for (i = 0; i < 12; i++) {
   	    grass += SW_VegProd.grass.CO2_biomass[i];
   	    shrub += SW_VegProd.shrub.CO2_biomass[i];
-  	    tree += SW_VegProd.tree.CO2_biomass[i];
+  	    tree += SW_VegProd.tree.CO2_pct_live[i];  // Only pct live is affected
   	    forb += SW_VegProd.forb.CO2_biomass[i];
   	  }
   	  grass /= 12;
   	  shrub /= 12;
   	  tree  /= 12;
   	  forb  /= 12;
-  	  total = grass + shrub + tree + forb;
+  	  total = grass + shrub + forb;
   	  BIO_mult = c->co2_biomass_mult;
   	  WUE_mult = c->co2_wue_mult;
   	  
diff --git a/SW_VegProd.c b/SW_VegProd.c
index e8c76cc5c..587882bc1 100644
--- a/SW_VegProd.c
+++ b/SW_VegProd.c
@@ -1233,10 +1233,10 @@ void SW_VPD_init(void) {
 	}
 
 	if (GT(v->fractionTree, 0.)) {
-	  apply_CO2(v->tree.CO2_biomass, v->tree.biomass);
+	  apply_CO2(v->tree.CO2_pct_live, v->tree.pct_live);
 		interpolate_monthlyValues(v->tree.litter, v->tree.litter_daily);
-		interpolate_monthlyValues(v->tree.CO2_biomass, v->tree.biomass_daily);
-		interpolate_monthlyValues(v->tree.pct_live, v->tree.pct_live_daily);
+		interpolate_monthlyValues(v->tree.biomass, v->tree.biomass_daily);
+		interpolate_monthlyValues(v->tree.CO2_pct_live, v->tree.pct_live_daily);
 		interpolate_monthlyValues(v->tree.lai_conv, v->tree.lai_conv_daily);
 	}
 
diff --git a/SW_VegProd.h b/SW_VegProd.h
index 86e201386..913adbfa3 100644
--- a/SW_VegProd.h
+++ b/SW_VegProd.h
@@ -57,6 +57,7 @@ typedef struct {
 	biomass[MAX_MONTHS], /* monthly aboveground biomass (g/m**2) */
 	CO2_biomass[MAX_MONTHS], /* monthly aboveground biomass after CO2 effects */
 	pct_live[MAX_MONTHS], /* monthly live biomass in percent   */
+	CO2_pct_live[MAX_MONTHS], /* monthly live biomass in percent after CO2 effects */
 	lai_conv[MAX_MONTHS]; /* monthly amount of biomass   needed to produce lai=1 (g/m**2)      */
 
 	RealD litter_daily[MAX_DAYS + 1], /* daily interpolation of monthly litter values (g/m**2)    */