منابع مشابه
Demography and Growth
Demographic change can have profound effects on a country’s economy and public finances. These effects generally manifest themselves over multi-decade periods, but the deterioration in many countries’ public finances and concerns about their underlying growth potential have recently brought demographic issues to the fore. Against this background, this article reviews the medium-term demographic...
متن کاملRehydration versus Growth-induced Water Uptake in Plant Tissues.
Experiments show that the rate of water uptake by living tissues external to mature xylem of cotton stems (Gossypium hirsutum L. Auburn 7-683) is very similar to the corresponding curves for leaf tissue. In both cases one obtains a two-phase curve with phase I corresponding to passive rehydration and phase II pertaining to active growth.A theory of water movement in plant tissue first proposed ...
متن کاملGeography, demography, and economic growth in Africa.
This paper presents the effects of climate, topography, and natural ecology on public health, nutrition, demographics, technological diffusion, international trade and other determinants of economic development in Africa. The goal of this paper is to emphasize the need for intensified research on the issues at the intersection of ecology and human society. Geography was given emphasis because ...
متن کاملPlant Demography and Chaparral Management in Southern California 1
A landscape may be viewed as a mosaic of patches. The state of the ecosystem can be defined by the abundance of species measured in some appropriate way. Within each patch the species populations change as the result of mortality and establishment. Through time, species populations are disappearing in some patches and dispersing to and becoming established in others where they are absent; the g...
متن کاملMatrix dimensions bias demographic inferences: implications for comparative plant demography.
While the wealth of projection matrices in plant demography permits comparative studies, variation in matrix dimensions complicates interspecific comparisons. Collapsing matrices to a common dimension may facilitate such comparisons but may also bias the inferred demographic parameters. Here we examine how matrix dimension affects inferred demographic elasticities and how different collapsing c...
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ژورنال
عنوان ژورنال: New Phytologist
سال: 1978
ISSN: 0028-646X,1469-8137
DOI: 10.1111/j.1469-8137.1978.tb02286.x