Rangeland Ecology & Management

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Seedling recruitment of perennial grasses in degraded areas of the Patagonian Monte
Author
Bisigato, Alejandro Jorge
Bertiller, Monica Beatriz
Publisher
Society for Range Management
Publication Year
2004-03-01
Body

The recruitment of perennial grass seedlings in degraded areas of the Patagonian Monte was analyzed. Recolonization of large bare-soil areas by dwarf shrubs or perennial grasses was hypothesized to create favorable microsites for grass seedling recruitment. Under natural field conditions, soil moisture (0-20 cm), root biomass (0-20 cm), the soil seed bank of perennial grasses, and density of perennial grass seedlings in the center of large bare soil areas and in microsites neighboring isolated plants of perennial grasses and dwarf shrubs were assessed. A manipulative experiment was conducted to evaluate seedling recruitment at the 3 microsites with identical density of seed addition of perennial grasses, under situations of root exclusion, and water addition. Under natural field conditions, root biomass did not differ among microsites. Soil moisture, seed density, and seedling density of perennial grasses were higher near perennial grasses than in bare soil or next to dwarf shrubs. Recruitment of perennial grass seedlings did not differ among microsites when the density of seeds did not vary among them or roots of the established plants were excluded. Water increased perennial grass seedling recruitment at all microsites. In degraded areas of the Patagonian Monte the spatial distribution of the soil seed bank followed by water availability are the main limiting factors of seedling recruitment of perennial grasses. Managerial practices oriented to maintain and increase the soil seed bank of perennial grasses, such as grazing exclusion during the grass reproductive period, might contribute to promote the re-establishment of perennial grasses. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020

Language
en
Resource Type
Text
Document Type
Journal Issue/Article
Digital Object Identifier (DOI)
10.2111/1551-5028(2004)057[0191:SROPGI]2.0.CO;2
Additional Information
Bisigato, A. J., & Bertiller, M. B. (2004). Seedling recruitment of perennial grasses in degraded areas of the Patagonian Monte. Journal of Range Management, 57(2), 191-196.
IISN
0022-409X
OAI Identifier
oai:repository.arizona.edu:10150/643521
Journal Volume
57
Journal Number
2
Journal Pages
191-196
Journal Name
Journal of Range Management
Keywords
facilitation
competition
arid ecosystems
soil seed bank
patch dynamics
water availability