Catch crop diversity increases rhizosphere carbon input and soil microbial biomass
- NormanGentsch
- JensBoy
- Juan DanielKennedy Batalla
- DianaHeuermann
- Nicolausvon Wirén
- DörteSchweneker
- UlfFeuerstein
- JonasGroß
- BernahrdBauer
- BarbaraReinhold-Hurek
- ThomasHurek
- FabricioCamacho Céspedes
- GeorgGuggenberger
Abstract
Introduction
Material and methods
Results
Plant biomass and net ecosystem exchange
The NEE decreased significantly with increasing catch crop diversity (Fig. 1), suggesting increasing -C uptake from the atmosphere.
Table 1. Representation of the p-values
table1_active <- data.frame(dat[c(1:5)]) #subsets on active genes
table1_active <- melt(table1_active,id.vars = c("Study","Label")) #melts on Study and Label Variables
table1_active$interaction <- interaction(table1_active$Study,table1_active$variable)
table1_active <- reshape(table1_active, idvar="interaction", timevar = "Label",direction="wide")
table1_active <- table1_active[,c(2:4,7,10)]
table1_silent <- data.frame(dat[c(1:2,6:8)]) #subsets on silent genes
table1_silent <- melt(table1_silent,id.vars = c("Study","Label")) #melts on Study and Label Variables
table1_silent$interaction <- interaction(table1_silent$Study,table1_silent$variable)
table1_silent <- reshape(table1_silent, idvar="interaction", timevar = "Label",direction="wide")
table1_silent <- table1_silent[,c(2:4,7,10)]
table1 <- rbind(table1_active,table1_silent) #combines silent and active into one data frame
#changes column names
colnames(table1) <- c("Study","Comparison","Z value","P value","Sample size (n)")
#creates comparison column/ renames comparisons
table1$Comparison <- rep(c(rep("0hr vs 1hr",3),rep("0hr vs 24hr",3),rep("1hr vs 24hr",3)),2)
rownames(table1) <- NULL #deletes row names
table1$Study <- as.character(table1$Study) #Makes 'study' variable as character
table1[c(2:3,5:6,8:9,11:12,14:15,17:18),2] <- c("","")
#label active and silent categories
table1$Genes <- c(c("Active",rep(c(""),8)),c("Silent",rep(c(""),8)))
table1 <- table1[,c(6,2,1,3:5)]
table1
Discussion
NEE is linked to plant diversity
... The NEE in our study showed a remarkably strong negative gradient from mustard to mix 4 to mix 12 (Fig. 1), which suggested higher photosynthetic -C fixation rates with increasing catch crop diversity.