摘要:

ABSTRACT:This article, based on a review of the literature, examines several aspects of the rhizosphere ecology of submersed macrophytes. These include the role of the rhizosphere microflora in affecting plant growth through influences on nutrient availability and production of plant growth regulating compounds. Interactions between components of the sediment microflora and plant roots are considered in relation to plant nitrition and growth. Possible applications of this information to the management of submersed macrophytes are considered.

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1989.tb05681.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

ABSTRACT:Four alternate schemes often used to deal with a water shortage are: physical rationing, lifeline with increasing block rates, rationing with resale, and pure price rationing. Each of these are analyzed using a supply‐demand framework. The theoretical results are applied to a representative California water district and the welfare loss is calculated for a hypothetical 20 percent reduction in water supply for six different income classes. We find that reliance on schemes using the price mechanism in one form or another is clearly superior, in terms of welfare loss, as a means of dealing with a water shortag

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1989.tb05682.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

ABSTRACT:Regionalization of design storms can enhance their utility. Otherwise they have to be separately developed for different regions. Huff curves developed from point rainfall data collected at Coshocton, Ohio, and Chicago, Illinois, and from area‐averaged Illinois and Texas precipitation data, are compared. The curves are similar in shape and position, with some visual differences depending on quartile. Kolmogorov‐Smirnov tests showed no significant differences in moat of the comparisons. Where significant differences existed, they may not represent real differences due to the small number of storms sampled. Consequently, regionalization of Huff curves from Ohio to Illinois to Texas may be appropriate. The comparison of Huff curves is affected to an unknown degree both by the effects of area averaging of data and by basis. of‐development differences. The effects of observed differences in Huff curves on watershed response variables (e.g., peak flow) requires further

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1989.tb05683.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY