Abstract
Abstract Questions Do shrubs regulate herbaceous plant community by modifying seed and plant distributions at the individual shrub scale? Do the magnitude and extent of effects at this scale change with shrub cover? Location A desert steppe, Mandalgobi, Mongolia. Methods We compared soil properties, seed accumulation and the establishment of plants of three functional types (annual forb, perennial forb and perennial graminoid) between shrub microsites (on mounds vs mound interspace) at sites differing in shrub coverage (high and low). Results Shrub patches (a legume Caragana microphylla ) promoted seed accumulation but inhibited plant establishment on mounds, relative to the mound interspace, for all functional types. However, the effects varied with shrub cover, particularly in the mound interspace, with responses specific to each functional type. The accumulation of soil and annual forb seeds increased with shrub cover at both microsites. Additionally, the density of annual forbs was positively related to shrub cover in the mound interspace. In contrast, the density of perennial forbs and graminoids decreased with increasing shrub cover at both microsites, possibly because of enhanced sand accumulation. Conclusion Shrubs shape herbaceous plant community by causing differences at the individual shrub scale in seed and plant distributions. Additionally, we showed that individual shrub effects are shrub cover‐dependent: dense shrub stands enhanced the dominance of annual forbs in spite of the negative effect found at the individual shrub scale, whereas perennial forbs and graminoids were less abundant in denser shrub stands. Shrubs can play an important role in structuring plant communities via shrub cover‐dependent variation at microsites.
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Claims 9
Claim · model-written summary
Shrub patches promoted seed accumulation relative to the mound interspace.
Verbatim
t0“population dynamics of herbaceous plants”
e1“Shrub patches (a legume Caragana microphylla ) promoted seed accumulation but inhibited plant establishment on mounds, relative to the mound interspace”
Claim · model-written summary
Shrub patches inhibited plant establishment on mounds relative to the mound interspace.
Verbatim
t0“population dynamics of herbaceous plants”
e1“Shrub patches (a legume Caragana microphylla ) promoted seed accumulation but inhibited plant establishment on mounds, relative to the mound interspace”
Claim · model-written summary
Accumulation of soil and annual forb seeds increased with shrub cover at both microsites.
Verbatim
t0“population dynamics of herbaceous plants”
e2“The accumulation of soil and annual forb seeds increased with shrub cover at both microsites”
Claim · model-written summary
Density of annual forbs was positively related to shrub cover in the mound interspace.
Verbatim
e3“the density of annual forbs was positively related to shrub cover in the mound interspace”
Claim · model-written summary
Density of perennial forbs and graminoids decreased with increasing shrub cover at both microsites.
Verbatim
e4“the density of perennial forbs and graminoids decreased with increasing shrub cover at both microsites”
Claim · model-written summary
The decrease in perennial forb and graminoid density may be due to enhanced sand accumulation.
Verbatim
e4“the density of perennial forbs and graminoids decreased with increasing shrub cover at both microsites”
e5“possibly because of enhanced sand accumulation”
Claim · model-written summary
Shrubs shape the herbaceous plant community through differences at the individual shrub scale in seed and plant distributions.
Verbatim
e6“Shrubs shape herbaceous plant community by causing differences at the individual shrub scale in seed and plant distributions”
Claim · model-written summary
Dense shrub stands enhanced the dominance of annual forbs despite the negative effect at the individual shrub scale.
Verbatim
e7“dense shrub stands enhanced the dominance of annual forbs in spite of the negative effect found at the individual shrub scale”
Claim · model-written summary
Perennial forbs and graminoids were less abundant in denser shrub stands.
Verbatim
e1“perennial forbs and graminoids were less abundant in denser shrub stands”