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Effects of plant species and plant diversity on soil nematodes – a field experiment on grassland run for seven years

Effects of plant species and plant diversity on soil nematodes – a field experiment on grassland... AbstractPlant species identity and diversity may greatly influence the composition ofthe nematode fauna. In this study the development of the nematode fauna wasfollowed in a field experiment on arable soil with monocultures and mixturesof several plant species. Experimental plots were sown with one, four or 12species of grass, legumes and forbs and were sampled four times in 7 years.Nematode diversity was little influenced by plant diversity. Due to apronounced increase of Paratylenchus projectus populations, the Shannondiversity index decreased in several treatments towards the end of theexperiment. Differences in nematode faunal composition among treatmentsincreased with time. In spite of the rather long duration of the experiment,the faunal composition did not stabilise but changed continuously. Theobligate plant feeders Tylenchorhynchus dubius, T. maximus and Pratylenchusspp. occurred in higher numbers in monocultures than in mixtures of severalplant species. Among the microbivores, the abundance of some bacterial- andfungal-feeding nematode taxa seemed to be directly influenced by the plantspecies identity. In the plots with Trifolium spp. there was an increase ofrapidly growing bacterial feeders belonging to Rhabditidae andPanagrolaimidae already after the first growing season. The abundances ofsome bacterial-feeding nematodes were correlated to total plant production.The numbers of the omnivorous Mesodorylaimus sp. appeared to be influencedby the degree of plant coverage. The abundance of several nematode taxaappeared to be little influenced by the composition of the vegetation. Theplant feeder P. projectus and the bacterial feeder Prismatolaimus sp.reacted rather slowly and a distinct increase in numbers was only seen after7 years, when P. projectus strongly dominated the fauna in severaltreatments. Among the bacterial feeders, some species with moderate growthrate belonging to Cephalobidae decreased with time in severaltreatments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

Effects of plant species and plant diversity on soil nematodes – a field experiment on grassland run for seven years

Sohlenius, Björn; Boström, Sven; Viketoft, Maria
Nematology , Volume 13 (1): 17 – Jan 1, 2011
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1388-5545
eISSN
1568-5411
DOI
10.1163/138855410X520945
Publisher site
See Article on Publisher Site

Abstract

AbstractPlant species identity and diversity may greatly influence the composition ofthe nematode fauna. In this study the development of the nematode fauna wasfollowed in a field experiment on arable soil with monocultures and mixturesof several plant species. Experimental plots were sown with one, four or 12species of grass, legumes and forbs and were sampled four times in 7 years.Nematode diversity was little influenced by plant diversity. Due to apronounced increase of Paratylenchus projectus populations, the Shannondiversity index decreased in several treatments towards the end of theexperiment. Differences in nematode faunal composition among treatmentsincreased with time. In spite of the rather long duration of the experiment,the faunal composition did not stabilise but changed continuously. Theobligate plant feeders Tylenchorhynchus dubius, T. maximus and Pratylenchusspp. occurred in higher numbers in monocultures than in mixtures of severalplant species. Among the microbivores, the abundance of some bacterial- andfungal-feeding nematode taxa seemed to be directly influenced by the plantspecies identity. In the plots with Trifolium spp. there was an increase ofrapidly growing bacterial feeders belonging to Rhabditidae andPanagrolaimidae already after the first growing season. The abundances ofsome bacterial-feeding nematodes were correlated to total plant production.The numbers of the omnivorous Mesodorylaimus sp. appeared to be influencedby the degree of plant coverage. The abundance of several nematode taxaappeared to be little influenced by the composition of the vegetation. Theplant feeder P. projectus and the bacterial feeder Prismatolaimus sp.reacted rather slowly and a distinct increase in numbers was only seen after7 years, when P. projectus strongly dominated the fauna in severaltreatments. Among the bacterial feeders, some species with moderate growthrate belonging to Cephalobidae decreased with time in severaltreatments.

Journal

Nematology – Brill

Published: Jan 1, 2011

Keywords: GRASS; NEMATODE COMMUNITY STRUCTURE; FORBS; SWEDEN; LEGUMES

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