منابع مشابه
Dietary protein quality and malnutrition in Africa.
The WHO (2007) Technical Report on protein and amino acid requirements in human nutrition states that the best estimate for a population average requirement is 105 mg nitrogen/kg body weight per day, or 0·66 g protein/kg body weight per day. In many developing countries protein intake falls significantly short of these values. Apart from protein quantity, protein quality including bioavailabili...
متن کاملTree cover in Central Africa: determinants and sensitivity under contrasted scenarios of global change
Tree cover is a key variable for ecosystem functioning, and is widely used to study tropical ecosystems. But its determinants and their relative importance are still a matter of debate, especially because most regional and global analyses have not considered the influence of agricultural practices. More information is urgently needed regarding how human practices influence vegetation structure....
متن کاملLand-use change outweighs projected effects of changing rainfall on tree cover in sub-Saharan Africa.
Global change will likely affect savanna and forest structure and distributions, with implications for diversity within both biomes. Few studies have examined the impacts of both expected precipitation and land use changes on vegetation structure in the future, despite their likely severity. Here, we modeled tree cover in sub-Saharan Africa, as a proxy for vegetation structure and land cover ch...
متن کاملApproximating the minmax rooted-tree cover in a tree
Given an edge-weighted rooted tree T and a positive integer p ( n), where n is the number of vertices in T , we cover all vertices in T by a set of p subtrees each of which contains the root r of T . The minmax rooted-tree cover problem asks to find such a set of p subtrees so as to minimize the maximum weight of the subtrees in the set. In this paper, we propose an O(n) time (2 + ε)-approximat...
متن کاملClimatological determinants of woody cover in Africa.
Determining the factors that influence the distribution of woody vegetation cover and resolving the sensitivity of woody vegetation cover to shifts in environmental forcing are critical steps necessary to predict continental-scale responses of dryland ecosystems to climate change. We use a 6-year satellite data record of fractional woody vegetation cover and an 11-year daily precipitation recor...
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ژورنال
عنوان ژورنال: Global Environmental Change
سال: 2014
ISSN: 0959-3780
DOI: 10.1016/j.gloenvcha.2013.12.001