Effects of different crop rotation system on the characteristics of soil weed seedbank

Abstract

Abstract: Field studies were conducted to evaluate the effects of three different crop rotation systems,rice-wheat (RW),maize-wheat (MW) and soybean-wheat (SW) rotation,on the characteristics of soil weed seedbank.The results showed that crop rotation significantly affects the density and species composition of weed seedbank.By rotation of wheat with maize (MW) and soybean (SW) for 2 years,seedbank density decreased 27.16% and 44.44% respectively compared with RW.Major weed species in the soil seedbank under rice-wheat cropping were Lindernia procumbens,Cyperus difformis,Beckmannia syzigachne,Ammannia baccifera and L.chinensis .In MW,relative abundance (RA) of Digitaria sanguinalis,C.iria and Fimbristylis dichotoma increased significantly,but the RA of Monochoria vaginalis,A.baccifera,B.syzigachne decreased remarkably.While in SW,RA of Mazus japonicus,D.sanguinalis,Eclipta prostrata,F.dichotoma had shown marked increase.The species diversity of MW was higher than that of SW and RW.Based on the species similarity index of weed seedbank,the index between MW and SW was the highest.The reason why crop rotation affects the density and species composition of the weed seedbank is that the use of crop sequences diversify the selection pressure and prevent the proliferation of some weed species that has adapted well to a single cropping system.

Key words: Anthocephalus chinensis, Heat dissipation, Horsfieldia tetratepala, Photosynthesis, Pometia tomentosa, Seedlings, Tropical rain forest tree species

CLC Number:

S451.0

WEI Shouhui, QIANG Sheng, MA Bo, WEI Jiguang. Effects of different crop rotation system on the characteristics of soil weed seedbank[J]. cje, 2005, (4): 385-389.

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