Table 2 Regression results for the associations of bottom-up and top-down effects with the two nematode diversity measurements (ENS and MTD) using mixed-effects models in plant monocultures and mixed plant communities.

Statistical significance is based on Wald type II χ² tests. Significant associations (P < 0.05) are given in bold. All regression coefficients are based on rescaled response variables. S, shoot biomass; R, root biomass 2012; PD, predator density.

Plant monoculturesMixed plant communities (16 species)
ENSMTDENSMTD
βtPβtPβtPβtP
Indicators of bottom-up effects
S−0.252−1.5420.123−0.083−0.4930.6210.3061.4980.1340.0890.4130.679
R−0.091−0.5410.588−0.172−0.9250.354−0.485−2.5700.010−0.017−0.0810.935
Indicator of top-down effects
PD0.4182.7220.0060.1570.9430.345−0.05−0.2500.8020.5392.9390.003
Interactive effects
S*PD0.5050.8940.371−1.331−2.2210.026−0.934−1.6530.0980.5431.0660.286
R*PD0.1260.4270.669−0.029−0.090.9280.3270.3270.5280.6531.3450.178