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A phylogenetic perspective on fine root ecology: assessing the role of root evolution on fine root functional traits and ecological interactions in woody angiosperms.Valverde-Barrantes, Oscar Jesus 06 December 2013 (has links)
No description available.
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The ‘Third Wave’ Religious Right Movement and the growth of Zimbabwean Christianity : faith or economic response?Mpofu, Sifiso January 2013 (has links)
This thesis is an historical analytical investigation and theological analysis
of the fundamental trends of the ‘Third Wave’ Religious Right Movement and
the growth of Zimbabwean Christianity. In an attempt to understand the
appealing and growth factors of this religious movement in the Zimbabwean
Church scene, the research focuses on the trends and behaviour of the
Third Wave Religious Right Movement in Zimbabwe and the critical aspect of
how this religious movement communicates the Christian faith to its
audience. A critical thrust of the study is the question of whether the
disciples of the charismatic movement are motivated by faith or economic
factors which may ultimately not be the authentic summons of the gospel of
Jesus Christ. The research addresses fears and suspicions of many
Christians who are caught up between faith and fear response to the
proclamation of the Gospel of Jesus Christ by the New Religious Right
Movements, particularly in Zimbabwe.
The hypothetical statement of this work is that there seems to be a subtle
reconstruction identity in the theology of the “Third Wave” Religious Right
Movement as is clearly manifested through the maneuverings of Christians
from the ‘traditional churches’ to these ‘newer charismatic churches in
trends which reflect the changing religious geography and the face of African
Christianity in general and Zimbabwean Christianity in particular. The
research explores the nature, impact and significance of the post – modern ‘Third Wave’ Religious Right Movement in Zimbabwean society in particular.
The identity and nature of the ‘Third Wave’ Religious Right Movement in its
historical perspective discussed by means of identifying and analyzing the
characteristics of this movement and its theological perspectives as well as
discussing the factors that promote the growth of the movement in the
context of Missio Dei (God’s Mission) and the society in general. Critical to
this type of Christianity are the images of power and prosperity which are
understood as signs of faith. The impact and effects of this type of faith
expression in the socio-political landscape is fully explored.
The primary methodology in this study is the historical critical method
complimented by oral historiography. Both primary and secondary sources
are utilized in this research in a holistic framework for analyzing the
historical trends as they unfold in the context of religious declarations and
transformations that are part of the phenomenon under investigation. The
study observes the translation model of evangelization in the unfolding
discourse of the ‘Third Wave’ Religious Right Movement.
The study ultimately reveals how people’s economic fears and hopes in the
midst of life’s challenges draw them toward religious movements which
promise to positively promote a glorious life with practical results being
realized “here and now”. This study has clearly exposed how religion,
specifically charismatic Christianity, is seen as a package of an abundant life in the context of humanity’s needs and challenges. There is a clear obsession, in the charismatic New Religious Right Movement, with wealth
and health as pedestals of salvation and a faithful Christian life.
Surprisingly, there is very little reference to moral and ethical issues from
the charismatic prophets who are the founders of these New Right
Movements. The research notes that the interests of these newer right
movements are in prosperity and health: “signs of being saved and blessed”.
Lack of economic success is blamed on demons which also causes poor
health hence the need to denounce the powers of Satan and engage on “the
heavenly gear”. Such teachings have conditioned the prospective converts to
seek after material benefits and values as critical aspects of the meaning of
salvation and the mission of Christ.
The study further reveals that the ‘Third Wave Religious Right Movement
promotes a subtle way of making disciples instead of the traditional way of
faith response to the gospel proclamation. But does this charismatic
religious life have any relevance to our human situation today? The seven
compelling chapters of this study have tackled this question and many
others, pointing the way to an authentic Christian mission that is alive and
relevant to the meaning of salvation in the context of orthodox Christianity.
This study concludes that the Church is a catalyst which carries the keys of
salvation to bring meaning and solutions to the varied human fears and
failures that characterise the temporary nature of human existence. But in
doing so; the Church must act in spirit of orthodox Christianity which is the
sine qua non of salvation. / Thesis (PhD)--University of Pretoria, 2013. / gm2014 / Church History and Church Policy / unrestricted
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À la racine des traits fonctionnels : comprendre l’influence de la fertilité des sols sur la distribution des traits racinaires et l’impact de cette association sur la distribution des espèces végétalesGuilbeault-Mayers, Xavier 08 1900 (has links)
Les plantes se distribuent dans des habitats présentant une disponibilité variable en nutriment et s'y adaptent en ajustant leur taux de croissance relatif. Les espèces adaptées aux habitats infertiles, affichent un taux de croissance plus faible que celles adaptées aux habitats fertiles. Les adaptations expliquant cette distribution ont été identifiées, premièrement, au niveau des feuilles. Un fort taux de fixation du carbone et d’allocation de ce dernier à la croissance sont favorisés en investissant davantage dans des tissus foliaires contenant des enzymes photosynthétiques riches en azote, par rapport aux tissus structuraux riches en carbone. Inversement, les feuilles favorisant une croissance lente présentent une plus grande quantité de tissus structuraux que de tissus riches en enzymes photosynthétiques, ce qui prolonge leur longévité, mais restreint leur taux d'assimilation du carbone. Étant donné que les adaptations foliaires dépendent de l'utilisation des nutriments acquis par les racines, les adaptations de ces dernières sont essentielles pour comprendre la distribution des plantes.
Le fonctionnement des racines est influencé par les mêmes variations dans le ratio entre les tissus à forte teneur en protéines riches en azote et les tissus structuraux. Les fortes valeurs de ce ratio améliorent l’acquisition des nutriments et soutiennent une croissance rapide, tandis que les faibles valeurs prolongent la longévité des racines, mais restreignent leur taux d'acquisition. Cependant, les racines doivent également explorer le sol dû à la mobilité limitée des nutriments. Cette fonction est réalisée en établissant des relations symbiotiques avec des champignons ou par l'allongement de leurs racines. Cependant, contrairement aux adaptations foliaires, la relation entre ces adaptations racinaires et la disponibilité des nutriments présente des résultats contradictoires. De plus, ces adaptations n'influencent pas l'acquisition des nutriments non directement disponibles, comme les nutriments organiques, qui peuvent représenter une proportion importante des nutriments du sol. Cela limite notre compréhension de la nutrition des plantes et entrave notre compréhension des mécanismes expliquant leur distribution.
Afin de mieux comprendre la nutrition des plantes, des feuilles et des racines furent échantillonnées le long de gradients de fertilité. Les résultats ont montré que l'utilisation de nutriments organiques par le biais d'enzymes hydrolytiques augmentait à mesure que la fertilité des sols diminuait. De plus, une forte corrélation entre cette adaptation et les adaptations racinaires liées aux taux d'acquisition des nutriments a été observée, mais aucune corrélation n'a été constatée avec celles liées à l'exploration du sol. En revanche, dans un autre système d'étude, les résultats ont indiqué que les adaptations racinaires liées à l'exploration du sol, plutôt que celles associées aux taux d'acquisition des nutriments, s'alignaient avec la variation de la disponibilité des nutriments et se coordonnaient avec les adaptations foliaires qui permettent d’expliquer en partie la distribution des plantes. Dans l'ensemble, ces études ont approfondi notre compréhension de la nutrition des plantes et ont révélé différentes relations entre la variation de la disponibilité des nutriments et les adaptations racinaires influençant l'acquisition des nutriments et l'exploration du sol. Cela suggère qu’une généralisation des adaptations racinaires répondant systématiquement aux demandes nutritionnelles des feuilles est peu probable. / Plants are distributed across habitats of varying nutrient availability and adapt by adjusting,
notably, their relative growth rates. Species adapted to nutrient-poor habitats exhibit lower growth
rates than those adapted to nutrient-rich habitats. The adaptations explaining this distribution have
been identified, first and foremost, at the leaf level. Leaves promoting rapid growth enhance net
carbon assimilation by investing more in nitrogen-rich photosynthetic enzymes compared to
carbon-rich structural tissues. This extends their lifespan, enhances their nutrient-use efficiency but
limits carbon assimilation. Given that foliar adaptations depend on the utilization of nutrients
acquired by roots, root adaptations are essential to understanding plant distribution.
Plants possess also the ability to modify the ratio between nitrogen-rich protein tissues and carbonrich structural tissues in their roots. Similarly to leaf functioning, increasing this ratio enhances the
efficiency of nutrient acquisition while minimizing carbon investment, enabling optimal carbon
allocation for growth. On the other hand, they can decrease this ratio to prioritize nutrient
conservation, which extends their longevity but restricts nutrient acquisition rate. However, roots
must also explore the soil due to the limited mobility of nutrients. Soil exploration is achieved by
establishing symbiotic relationships with fungi or through the elongation of their roots. Unlike leaf
adaptations, the relationship between these root adaptations and nutrient availability yields
contradictory results. Additionally, these adaptations do not directly influence the acquisition of
non-readily available soil nutrients, such as organic nutrients, which can represent a significant
proportion of the total nutrient pool. Thus, our understanding of plant nutrition is limited, impeding
our understanding of the mechanisms explaining their distributions.
To contribute to an enriched understanding of plant nutrition, leaves and roots were sampled along
strong fertility gradients. The results revealed an increase in the utilization of organic nutrients
through hydrolytic enzymes as the availability of directly accessible nutrients declined.
Furthermore, a strong correlation between this adaptation and root adaptations related to nutrient
acquisition rates has been observed, but no correlation was found with adaptations related to soil
exploration. On the other hand, in another study system, the results indicated that root adaptations
related to soil exploration, rather than those associated with nutrient acquisition rates, aligned with
the variation in nutrient availability and coordinated with foliar adaptations influencing net carbon assimilation. As a result, a high degree of mycorrhizal symbiosis was associated with leaves
favoring rapid growth in fertile soil. Overall, roots displaying a high density of structural tissues
and a high degree of symbiotic association were associated with fertile soil across two different
study systems. Altogether, these results have deepened our understanding of plant nutrition and
revealed different possible relationships between nutrient availability variation and root
adaptations influencing nutrient acquisition and soil exploration. This suggests that generalizing
root adaptations that consistently meet the nutrient demands of leaves is unlikely.
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