Figure legends
Figure 1 Functional group network webs in (a) Ambient, (b)
Drought, (c) Nitrogen and (d) Drought * Nitrogen. Blue lines represent
trophic interactions; Red lines represent biotic non-trophic
interactions; Gray lines represent abiotic non-trophic interactions. The
diameter of the circle under ambient is taken as the standard abundance,
and the diameter of the circle under treatment changed according to the
change of relative abundance (PS: plant suckers; PC: plant chewers; OM:
omnivores; DE: detritivores; WS: web spiders; GH: ground hunters; VH:
vegetation hunters; PA: parasite; PN: plant N content; EF: environmental
factors).
Figure 2 Networks properties (connectance, interaction
diversity and interaction strength) for the arthropod functional groups
for ambient vs. treatment (including drought, nitrogen and their
interaction) for 2 years. The Carnivores (C)-C value refer to network
descriptors of the interaction of secondary consumer (a-c, horizontal
interactions); C-Herbivores (H), the interaction between primary and
secondary consumer (d-f, vertical interaction); H-H, the interaction of
primary consumer (g-i, horizontal interactions); Total, the complete web
of consumer (j-l).
Figure 3 Interaction strength of environmental factors to
arthropod functional groups.
Figure 4 Response ratio of six β-diversity to N addition,
drought and their interaction in grassland. The response ratio is data
(treatment)/data (control), the horizontal error bars represent the 95%
confidence interval. βsor: overall pairwise
dissimilarity of S∅rensen, βsim: turnover,
βsne: nestedness; βbc: overall pairwise
dissimilarity of Bray-Curtis; βbal: balanced variation
in abundance; βgra: abundance gradients. Solid squares
represent significant response of β-diversity to treatments, while
hollow squares represent no significant responses.