3. Results
3.1. Effects on plant Shannon–Wiener index
There were significant interactive effects of plant diversity
levels of pre-grazing and large herbivores on the plant Shannon–
Wiener index (F6, 22= 3.895, P = 0.007), as well as plant diversity
levels of pre-grazing (F2, 22= 123.71, P < 0.0001) and grazing
treatments (F3, 22= 25.783, P < 0.0001). Plant Shannon–Wiener
index was higher in grazed plots by cattle and sheep than that in
control and grazed plots by goat at low plant diversity level. It was
also higher in all grazed plots than in control plots at both
intermediate and high plant diversity levels (Fig. 1).
3.2. Effects on insect abundance
Significant interactive effects of plant diversity and large
herbivore species on total insect abundance were detected
(Table 1). At low plant diversity level, total insect abundance
was higher in grazed plots by cattle and sheep than that of control
plots, and was higher in grazed plots by goats than that of other
plots at intermediate plant diversity level, was higher in grazed
plots by goats and sheep than that of non-grazed and cattle grazed
plots at high plant diversity level (Table 1)
3. Results3.1. Effects on plant Shannon–Wiener indexThere were significant interactive effects of plant diversitylevels of pre-grazing and large herbivores on the plant Shannon–Wiener index (F6, 22= 3.895, P = 0.007), as well as plant diversitylevels of pre-grazing (F2, 22= 123.71, P < 0.0001) and grazingtreatments (F3, 22= 25.783, P < 0.0001). Plant Shannon–Wienerindex was higher in grazed plots by cattle and sheep than that incontrol and grazed plots by goat at low plant diversity level. It wasalso higher in all grazed plots than in control plots at bothintermediate and high plant diversity levels (Fig. 1).3.2. Effects on insect abundanceSignificant interactive effects of plant diversity and largeherbivore species on total insect abundance were detected(Table 1). At low plant diversity level, total insect abundancewas higher in grazed plots by cattle and sheep than that of controlplots, and was higher in grazed plots by goats than that of otherplots at intermediate plant diversity level, was higher in grazedplots by goats and sheep than that of non-grazed and cattle grazedplots at high plant diversity level (Table 1)
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