摘要:

AbstractWhen sown over consecutive years at two sites in the Western Australian wheatbelt, a maximum of 34.5% of viableChondrilla junceaseeds gave rise to emerged seedlings. During the early winter months at one site, waterlogging on a duplex soil type led to an almost complete failure of emergence. Very low levels of seed persistence (maximum 3.1%) between years were noted.The protection provided by stubble enhanced the survival ofC. junceaseedlings which emerged during May, but for seedlings which emerged later, the effects of stubble upon seedling survival were strongly dependent upon the abundance of the red‐legged earth mite(Halotydeus destructor)At the observed densities of winter annuals, the presence of seedlings and young plants appeared to reduce seedling mortality inC. juncea.Young plants ofC. junceawere highly susceptible to simulated cultivation practices until 12 weeks following emergence. It is argued that seedling establishment of C.junceais most likely to occur during the pasture phase of crop/pasture rotations in the Western Australian wheatbelt and that pastures immediately following cropping years are most prone to invasio

ISSN:0307-692X    

DOI:10.1111/j.1442-9993.1989.tb01013.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

AbstractSurvivorship of first‐year plants ofChondrilla junceawas considerably higher on a deep yellow sand than on a yellow duplex soil. Mortality on the latter soil was associated with drying of the Al horizon during early summer. No plants produced seeds in their first year of growth on the duplex soil. However, during both years of the study, first‐year individuals of both forms ofC. junceaproduced viable seeds when growing on the deep sand. Higher population growth rates could be expected on deep sands, owing to a combination of earlier reproduction and greater survivorship through the first summer. It is suggested that whilst the entire wheatbelt might be climatically suitable forC. juncea, the invasive potential of this weed might be restricted by edaphic characteristics over large ar

ISSN:0307-692X    

DOI:10.1111/j.1442-9993.1989.tb01014.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

Book Reviewed in this article:Pesticide Impact on Stream Fauna with Special Reference to MacroinvertebratesR. C. Muirhead‐ThomsonThe World Mining Industry: Investment Strategy and Public Policy. World Industry Studies No. 6R. F. Mikesell and J. W. Whitney.Australian ArachnologyEdited by A. D. Austin and N. W. Heather.Effects of Atmospheric Pollutants on Forests, Wetlands, and Agricultural Ecosystems. NATO ASI Series, Series G. Ecological Sciences, Vol. 16.T. C. Hutchinson, K. M. Meema.Environmental Policies in East and WestEdited by G. Enyedi, A. J. Gijswijt and B. Rhode.The Koala — A Natural HistoryAnthony Lee and Roger Mar

ISSN:0307-692X    

DOI:10.1111/j.1442-9993.1989.tb01015.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY