Abstract
In order to elucidate the regulatory effects of the two planting
patterns on the soil migration of raindrops and runoff, the planting
period and idle period of dry land with a single planting of Prunella
vulgaris (traditional planting method) and P. vulgaris and earthworms
(ecological planting method) were investigated through simulated
rainfall experiments in the field. The results showed that: 1). The
regulation effect of the two planting modes on soil migration indicators
(raindrop separation rate, raindrop sediment transport rate, runoff
separation rate, and runoff sediment transport rate) showed an overall
decreasing trend with the increase of rainfall intensity or slope, which
can be described by a binary function;2). Compared with the planting
mode of Prunella vulgaris, the regulation effect of raindrop sediment
transport rate was significantly affected by rainfall intensity, and the
regulation effect of raindrop separation rate, runoff separation rate
and runoff sediment transport rate was significantly affected by slope
under Prunella vulgaris combined with earthworm planting mode. The
effects of rainfall intensity or slope on the regulation effects of
runoff separation rate and runoff sediment transport rate are similar
and the difference is not obvious; 3). Due to the special effect of
earthworms on soil ecology, Prunella vulgaris combined with earthworms
can improve the best impact index and inhibit soil migration in a short
time, and the contribution rate is more than 45%.However, only planting
Prunella vulgaris could not improve the soil properties in a short
period of time, which also caused the influence index of Prunella
vulgaris slope soil migration to be different from the regulation index
of Prunella vulgaris.