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Effects of long-term different fertilization regimes on the diversity of weed communities in oilseed rape fields under rice–oilseed rape cropping system

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Author(s): Ruhai Li | Sheng Qiang | Duosheng Qiu | Qiuhua Chu | Genxing Pan

Journal: Biodiversity Science
ISSN 1005-0094

Volume: 16;
Issue: 2;
Start page: 118;
Date: 2008;

Keywords: long-term fertilization | diversity of weed community | rice–oilseed rape cropping system | evenness

ABSTRACT
The effects of long-term different fertilization regimes on weed species diversity were evaluated in this study. Seven different fertilization treatments, each with three replicated plots and 20 years of fertilization, were investigated in oilseed rape fields under a rice–oilseed rape cropping system in Tai Lake region. Overall, 17 weed species from 11 families were recorded. Of these, Alopecurus aequali, A. japonicas, Beckmannia syzigachne, Malachium aquaticum, and Geranium carolinianum had high population density, andwere dominant in different plots. The weed species richness varied significantly among different fertilization treatments, ranging from 5 species in chemical fertilizer with oilseed rape stalk and rice straw treatment (CFOR) to 12 in N fertilizer treatment (NF). The composition and abundance of weed species also differed in different fertilization treatments. Shannon-Wiener index in NF was significantly higher than that in any other fertilization treatment while Simpson dominance index was the lowest. Pielou evenness index in non-fertilizer treatment (NoF) and NF were significantly higher than those in other fertilization treatments. As suggested by Whittaker index, chemical fertilizer and oilseed rape stalk treatment (CFO) and chemical fertilizer treatment (CF) had the most significant effects on weed community composition, chemical fertilizer and pig manure treatment (CFM) and chemical fertilizer and rice straw treatment (CFR) ranked the second, while NF and CFOR had no significant effect on weed community composition. Sørenson similarity index and clustering analysis suggested similar trends as Whittaker index. The results have indicated that the application of balanced N, P, K fertilizer and even plus organic manure (pig manure, oilseed rape stalk, and rice straw) was beneficial to effectively control dominant weeds and maintain weed species diversity by decreasing the abundance of those otherwise dominant species.
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