The effects of landscape complexity on arable weed species diversity in organic and conventional farming

Journal of Applied Ecology - Tập 42 Số 5 - Trang 873-882 - 2005
Indra Roschewitz1, Doreen Gabriel1, Teja Tscharntke1, Carsten Thies1
1Department of Agroecology, Georg-August University, Waldweg 26, D-37073 Göttingen, Germany

Tóm tắt

Summary There is growing concern about declining species diversity in agro‐ecosystems caused by agricultural intensification at the field and landscape scales. Species diversity of arable weeds is classically related to local abiotic factors and resource conditions. It is believed to be enhanced by organic farming but the surrounding landscape may also be important. This study assessed the ruderal vegetation, seed bank and seed rain in 24 winter wheat fields to examine the relative importance of organic vs. conventional farming and landscape complexity for weed species diversity. Diversity was partitioned into its additive components: alpha, beta and gamma diversity. Percentage arable land in a circular landscape sector of 1‐km radius around each study site was used as an indicator of landscape complexity. Weed species diversity in the vegetation, seed rain and seed bank was higher in organic than in conventional fields. Increasing landscape complexity enhanced species diversity more strongly in the vegetation of conventional than organic fields, to the extent that diversity was similar in both farming systems when the landscape was complex. Species diversity of the seed bank was increased by landscape complexity irrespective of farming system. Overall diversity was largely determined by the high heterogeneity between and within the fields (beta diversity). Only in very few cases could higher weed species diversity in complex landscapes and/or organic farming be related to species dependence on landscape or farming system. Synthesis and applications. Local weed species diversity was influenced by both landscape complexity and farming system. Species diversity under organic farming systems was clearly higher in simple landscapes. Conventional vegetation reached similar diversity levels when the surrounding landscape was complex through the presence of refugia for weed populations. Consequently, agri‐environment schemes designed to preserve and enhance biodiversity should not only consider the management of single fields but also of the surrounding landscape.

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Tài liệu tham khảo

10.1007/BF00345855

10.1016/0169-5347(87)90005-X

10.1016/S0167-8809(99)00104-8

10.2135/cropsci1995.0011183X003500050001x

10.1086/378901

Ellenberg H., 1988, Vegetation Ecology of Central Europe

Food and Agriculture Organization of the United Nations, 2001, FAO Statistical Databases.

Garve E., 1993, Rote Liste der gefährdeten Farn‐ und Blütenpflanzen in Niedersachsen und Bremen, Informationsdienst Naturschutz Niedersachsen, 1, 47

Garve E., 1991, Liste der wildwachsenden Farn‐ und Blütenpflanzen Niedersachsens. 1. Fassung vom 31·12, 1990, Naturschutz und Landschaftspflege in Niedersachsen, 24, 154

10.1046/j.1461-0248.2002.00335.x

10.1046/j.1523-1739.2003.01465.x

10.1016/S0167-8809(03)00084-7

Grime J.P., 1979, Plant Strategies and Vegetation Processes

10.1111/j.1744-7348.1999.tb05269.x

Hofmeister H., 1998, Lebensraum Acker

10.1016/j.biocon.2004.07.018

10.1111/j.0021-8901.2004.00949.x

10.1111/j.1365-2664.2003.00863.x

10.1023/A:1015580722191

10.1016/S0167-8809(03)00117-8

Jedicke E., 1997, Die Roten Listen. Gefährdete Pflanzen, Tiere, Pflanzengesellschaften und Biotope in Bund und Ländern

10.1007/978-3-7091-6246-0

10.1111/j.1365-2664.2003.00868.x

10.1038/35099540

Korneck D., 1988, Rote Liste der in der Bundesrepublik Deutschland ausgestorbenen, verschollenen und gefährdeten Farn‐ und Blütenpflanzen und ihre Auswertung für den Arten‐ und Biotopschutz, Schriftenreihe für Vegetationskunde, 19

Korneck D., 1996, Rote Liste der Farn‐ und Blütenpflanzen (Pteridophyta et Spermatophyta) Deutschlands, Schriftenreihe für Vegetationskunde, 28, 21

10.1023/B:BIOC.0000021323.18165.58

10.1046/j.1365-2699.2003.00878.x

10.1038/23127

10.2307/3545743

10.1046/j.1365-2664.2001.00611.x

10.1046/j.1365-3180.2003.00326.x

10.1890/1051-0761(2001)011[1586:WAASCR]2.0.CO;2

10.1890/1051-0761(1999)009[0634:DALSAP]2.0.CO;2

10.1111/j.1744-7348.1994.tb04942.x

10.1086/285332

10.1007/978-1-4419-0318-1

R Development Core Team, 2004, R: A Language and Environment for Statistical Computing

10.1046/j.1365-3180.1997.d01-39.x

10.1016/j.agee.2004.05.010

10.1111/j.1365-2664.2005.01014.x

10.2307/2845026

Sokal R.R., 1995, Biometry

Statistical Graphics Corp., 2001, Statgraphics Plus

Tilman D., 1982, Resource Competition and Community Structure

10.1038/nature01014

10.1023/A:1008114117913

10.1023/A:1023617117780

10.2307/2405097

Wisskirchen R., 1998, Standardliste der Farn‐ und Blütenpflanzen Deutschlands

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Journal of Applied Ecology

Tập 42 Số 5

873-882

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