Responses of weed community and soil biota to cessation of fertilization

어진우

KOREAN
P-ISSN2287-8327
E-ISSN2288-1220
SCOPUS, KCI

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ISSN : 2287-8327

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Vol.33 No.4

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Responses of weed community and soil biota to cessation of fertilization

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220

2010, v.33 no.4, pp.317-323

(2010). Responses of weed community and soil biota to cessation of fertilization. Journal of Ecology and Environment, 33(4), 317-323.

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Abstract

Nutrient availability is a critical component of agroecosystems, and is relevant to both above- and below- ground interactions. The principal objective of this study was to determine how the cessation of fertilization affects the communities of weeds and soil organisms in a corn/wheat field. Changes in dominant weed species, substrate-induced respiration,and the population density of nematodes and microarthropods were evaluated. Microbial substrate-induced respiration (SIR) and the population density of microarthropods decreased following the cessation of fertilization and were partly correlated with the aboveground weed biomass. The cessation of organic fertilizer application but continuing application of inorganic fertilizer reduced the population density of nematodes. In response to the cessation of fertilization, weed communities were dominated by species with little dependency on fertilization. Amaranthus retroflexus was identified as the most dominant species in the corn field; however, it was replaced by Digitaria ciliaris after the cessation of fertilization. In the wheat field, the cessation of fertilization led to a rapid reduction in the biomass of most weeds, except for Vicia angustifolia, supposedly as the result of symbiotic nitrogen fixation. Additionally, the fact that weed biomass was partially correlated with SIR or the population density of microarthropods may reflect a mutual feedback between soil organisms and weeds. The results indicate that the cessation of fertilization alters communities of weeds and soil organisms through changes in weed biomass and interactions with symbiotic microorganisms.

keywords: Amaranthus retroflexus, cessation of fertilization, Digitaria ciliaris, microarthropod, nematode, SIR, soil, weeds

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Article Contents

Vol.33 No.4

Responses of weed community and soil biota to cessation of fertilization

Abstract

Reference

Journal of Ecology and Environment