By Michael J. Crawley, Clive A. Stace
The observe 'aliens' can be utilized in lots of methods, to invoke worry, dislike and fascination. For biologists it's used to point organisms which were brought by means of humans to new territories. within the British Isles alien crops are universal, conspicuous, pestiferous, attractive, fit for human consumption – and will be either priceless and damaging. during the last fifty years, the learn of alien vegetation has stepped forward from an eccentric pastime, allowing beginner botanists to extend the complete of untamed vegetation that they can checklist, to the full-blown sciences of invasion ecology and alien genetics. Alien species now not current an not obligatory additional, yet has to be permitted as an essential component of mainstream botanical research. the volume and breadth of information that has been accrued on alien vegetation within the British Isles is outstanding. the topic has familiarize yourself either to naturalists and most of the people, as a result of such various issues as harm to the surroundings via jap Knotweed and New Zealand Pigmyweed, the allure of bees and butterflies to towns via such vegetation as Buddleja, the lawsuits concerning Leylandii hedges, the threats to the purity of our local Bluebell via the mass planting of its Spanish relative, and the cultivation of latest different types of Christmas tree. during this very important addition to the hot Naturalist sequence, Stace and Crawley offer a finished review of the various crops that experience develop into an essential component of the British wild flowers and a different perception into why alien crops are so very important.
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Additional resources for Alien Plants (Collins New Naturalist Library, Volume 129)
Arid land irrigation and soil fertility: problems of salinity, alkalinity, compaction. B. ): 211-236. B. 1955. Secular changes of tropical rainfall regimes. Q. J. R. Met. Soc. 81: 138-210. J. 1982. Persistence of subsaharan drought. Nature 299: 46-48. Meigs, P. 1953. World distribution of arid and semi-arid homoclimates. In Reviews of research on arid zone hydrology. Arid Zone Programme 1: 203-210. Paris: UNESCO. Otterman, J. 1974. Baring high-albedo soils by overgrazing: a hypothesised desertification mechanism.
Beran and R. Ratcliffe (eds): 317-330. Dordrecht: Reidel. J. A. Adamson (eds) 1982. A land between two Niles. Rotterdam: Balkema. Worthington. B. ) 1977. Arid land irrigation in developing countries. Oxford: Pergamon. 3 Wi Id desert relatives of crops: their direct uses as food Gary P. Nabhan' and Richard S. Felger2 'Office of Arid Lands Studies, University of Arizona, Tucson, Arizona 85719, USA 20ffice of Arid Lands Studies and Instituto de Ecologia, Mexico City, Mexico Introduction Arid lands worldwide offer a rich variety of wild and indigenous cultivated food plants adapted to low and variable precipitation regimes.
North American deserts have a high percentage of herbs with mucilaginous seeds with great hydroscopic capacities (Young & Evans 1973). The Sonoran and other tropical-derived New World hot deserts are vegetationally and floristically rich in woody legumes with nutritionally significant seeds and pods. It is ironic that much of the modern agricultural developments in arid zones depend on temperate or tropical crop species that are not well-adapted to high heat, low soil moisture and low humidity.