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Reintroduction of Nassella pulchra to California coastal grasslands: Effects of topsoil removal, plant neighbour removal and grazing

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Buisson, Elise Anderson, Sean Holl, Karen D. Corcket, Emmanuel Hayes, Grey F. Peeters, Alain [UCL] Dutoit, T. [UCL]

Question: What is the most appropriate combination of treatments to reintroduce Nassella pulchra, a perennial bunchgrass, into degraded mediterranean coastal grasslands? Location: Central coast of California, USA. Methods: N. pulchra was sown from seeds and transplanted into a degraded grassland in a multi-factorial experiment testing the effects of (1) two grazing intensities (lightly grazed by native mammal species or ungrazed); (2) topsoil removal and (3) reduction of plant neighbours. The experiment was carried out on two types of surrounding vegetation (exotic annual grasses and exotic forbs). Results: Topsoil removal greatly enhanced establishment from seeds and transplant survival, mainly because it reduced the exotic vegetation and thus reduced competition. While removing neighbours was essential when topsoil was left intact, it had a negative effect on N. pulchra when surrounding species included exotic forbs (Brassica spec. and Asteraceae) at low density (after topsoil removal). Moderate grazing by native mammals (deer, rabbits and gophers) did not affect N. pulchra. Conclusion: Our results suggest that seeding after topsoil has been removed is a promising method to reintroduce N. pulchra to highly degraded sites where there is little to no native seed bank.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2008
Language Anglais
Journal information "Applied Vegetation Science : official organ of the international association for vegetation science" - Vol. 11, no. 2, p. 195-204 (2008)
Peer reviewed yes
Publisher Opulus Press Uppsala Ab (Grangarde)
issn 1402-2001
e-issn 1654-109X
Publication status Publié
Affiliation UCL
Keywords competition ; exotic annual species ; native perennial bunchgrass ; nitrogen reduction ; weeding
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Bibliographic reference Buisson, Elise ; Anderson, Sean ; Holl, Karen D. ; Corcket, Emmanuel ; Hayes, Grey F. ; et. al. Reintroduction of Nassella pulchra to California coastal grasslands: Effects of topsoil removal, plant neighbour removal and grazing. In: Applied Vegetation Science : official organ of the international association for vegetation science, Vol. 11, no. 2, p. 195-204 (2008)
Permanent URL http://hdl.handle.net/2078.1/36672