WorldCat Identities

Hölscher, Dirk

Overview
Works: 66 works in 109 publications in 2 languages and 729 library holdings
Genres: Academic theses 
Roles: dgs, Other, Author
Publication Timeline
.
Most widely held works by Dirk Hölscher
Effects of tree species composition on fine root biomass and dynamics in the rhizosphere of deciduous tree stands in the Hainich National Park (Thuringia) by Andreas Jacob( )

2 editions published between 2012 and 2013 in German and held by 31 WorldCat member libraries worldwide

During the past two decades, much research has focused on understanding the role of biodiversity for ecosystem functioning and the provision of ecosystem goods and services for humanity. While several experiments with artificial grasslands and herbaceous communities provided clear evidence for a positive relationship between plant species diversity and aboveground productivity in species-rich communities less is known as to whether these results also apply to natural or near-natural communities. Only few data exist on the biodiversity-productivity relation in natural and semi-natural forest
Fine root traits, belowground interactions and competition effects on the rhizosphere of Fagus sylvatica and Fraxinus excelsior saplings by Friderike Beyer( )

2 editions published between 2012 and 2013 in English and held by 30 WorldCat member libraries worldwide

European beech (Fagus sylvatica L.) and European ash (Fraxinus excelsior L.) are common tree species in Central European forests and of high ecological as well as economic value. However, knowledge about the structure and function of the ecologically important fine root system of beech and ash and its impact on rhizosphere processes is scarce. Moreover, little is known about the direct intra- and interspecific belowground competition effects of these two species. This thesis presents results from different greenhouse experiments on the species-specific effects of beech and ash
Habitat Suitability Modeling for Tiger (Panthera tigris) in the Hukaung Valley Tiger Reserve, Northern Myanmar by Tin Zar Kywe( )

1 edition published in 2012 in English and held by 30 WorldCat member libraries worldwide

Competition mechanisms of native and exotic tree species by Heike Kawaletz( )

1 edition published in 2014 in English and held by 29 WorldCat member libraries worldwide

Tree water uptake partitioning and water use rates in a temperate mixed forest by Meik Meißner( )

2 editions published between 2013 and 2014 in English and held by 27 WorldCat member libraries worldwide

Wasserverfügbarkeit ist in Wäldern Mitteleuropas wie auch in anderen Regionen der Welt oftmals ein limitierender Faktor für die Produktivität eines Bestandes. Ebenso wurde bereits in zahlreichen Studien untersucht, inwiefern Biodiversität einen Einfluss auf die Produktivität von Pflanzengemeinschaften hat. Es gibt jedoch nur wenig Informationen darüber, wie sich Baumartenvielfalt auf die Wassernutzung eines Waldbestandes auswirkt. Die Wassermenge, die für Transpiration und Zuwachs unter gegebenen Umweltbedingungen zur Verfügung steht ist davon abhängig, wie gut Pflanzen den vorliegenden Was
Trace Gas Fluxes from Tropical Montane Forests of Southern Ecuador by Guntars O Martinson( )

1 edition published in 2011 in English and held by 25 WorldCat member libraries worldwide

Wasser- und Stoffhaushalt eines Agrarökosystems mit Waldbrache im östlichen Amazonasgebiet by D Holscher( Book )

5 editions published in 1995 in German and held by 24 WorldCat member libraries worldwide

Aim of this study is to assess the hydrological characteristics of the secondary vegetation. Therefore, in two sites the rainfall partitioning was measured and the evaporation from a medium aged fallow was estimated. Another important research goal was to evaluate the sustainability of the landuse system with respect to the nutrient budget. The soil chemical changes and the fluxes of nutrients with deposition, fertilization, burn, harvest and leaching were studied in different phases on an Ultisol-site
Investigations of genetic variation of teak (Tectona grandis Linn. f.) in Myanmar for conservation and sustainable utilization of genetic resources by Yazar Minn( )

1 edition published in 2012 in English and held by 23 WorldCat member libraries worldwide

Conversion of lowland forests to rubber and oil palm plantations changes nutrient leaching and nutrient retention efficiency in highly weathered soils of Sumatra, Indonesia by Syahrul Kurniawan( )

3 editions published in 2016 in English and German and held by 20 WorldCat member libraries worldwide

Over the last two decades, Sumatra, Indonesia has experienced rapid expansion of rubber and oil palm plantations through conversion of rainforests. This is evident from the 36% decrease in forest area in this region from 1990-2010. Such rapid land-use change necessitates assessment of its environmental impacts. Forest conversion to rubber and oil palm plantations are expected to increase nutrient leaching losses and decrease nutrient retention efficiency, following the changes in soil cover, litter input, soil nutrient availability and management practices. This thesis presents two studies,
Impacts of land-use conversion in Sumatra, Indonesia on soil nitrogen cycling, soil nutrient stocks and ecosystem dynamics by Kara Allen( )

2 editions published in 2015 in English and held by 20 WorldCat member libraries worldwide

Over the last two decades, deforestation rates in Sumatra, Indonesia have rapidly increased resulting in the conversion of large tracts of lowland forest into monoculture plantations of oil palm (Elaeis guineensis) and rubber (Hevea brasiliensis). Land-use conversion to agricultural systems has been found to decrease soil nutrient stocks and soil nutrient cycling rates overtime, which can lead to a dependence on fertilization that only temporarily improves soil nutrient availability. Furthermore, conversion of forest to crop monocultures threatens the high levels of biodiversity present in
Land use and land cover changes in South East Asia: The effects of land transformations on biophysical variables in Indonesia by Clifton R Sabajo( )

2 editions published in 2018 in English and held by 19 WorldCat member libraries worldwide

Over the last decades, Indonesia has experienced dramatic land transformations with an expansion of oil palm plantations at the expense of tropical forests. Indonesia is currently one of the regions with the highest transformation rate of the land surface worldwide related to the expansion of oil palm plantations and other cash crops replacing forests on large scales. As vegetation is a modifier of the climate near the ground these large-scale land transformations have major impacts on surface biophysical variables such as land surface temperature (LST), albedo, vegetation indices (e.g. the
The isotopic composition of CO2 and H2Ov fluxes in a managed beech forest - Instrument tests and ecological application of two laser-based absorption spectrometers by Jelka Braden-Behrens( )

2 editions published in 2018 in English and held by 18 WorldCat member libraries worldwide

Stabile isotope bieten wertvolle Einblicke in den gekoppelten Kohlendioxid (CO2) und Wasserdampf (H2Ov) Kreislauf auf Skalen von einem Blatt bis hin zu globalen Skalen. Vor allem bezogen auf Anwendungen unter Feldbedingungen haben neuere Entwicklungen laserbasierter Messtechniken das Potential der Erforschung von CO2- und H2Ov-Austauschprozessen mittels stabiler Isotope verstärkt. Hier stellen wir zwei Experimente vor, in denen zwei laserbasierte Infrarotspektrometer und zwei Methoden auf Ökosystemskala genutzt werden um die Isotopenkomposition verschiedener Komponenten des CO2 und H2Ov Kre
Shade trees in cacao agroforestry systems: influence on roots and net primary production by Yasmin Joana Monna Abou Rajab( )

2 editions published in 2016 in English and held by 18 WorldCat member libraries worldwide

Huge areas of natural forests are rapidly cleared worldwide to make way for agricultural cultivation systems. This has a substantial impact on the functioning of ecosystems, as well as on carbon cycling and hence effects global climate change. Currently, Indonesia has one of the highest deforestation rates worldwide and on the island of Sulawesi, where this study was carried out, substantial tracts of primary forest are being cleared in order to predominantly cultivate cacao (Theobroma cacao L.), which made Sulawesi the biggest producer of cacao within Indonesia. Cacao is an understory rain
Photosynthetic capacity and nitrogen nutrition of Ecuadorian montane forest trees by Bärbel Wittich( )

2 editions published between 2013 and 2014 in English and held by 17 WorldCat member libraries worldwide

With increasing elevation, the growth conditions of trees in tropical mountains become generally more adverse in terms of decreasing nutrient availabilities, decreasing temperatures and decreasing atmospheric concentration of carbon dioxide (CO2). In tropical montane forests, reduced decomposition rates at higher altitudes lead to thicker organic layers and together with reduced mineralization and nitrification rates to a change in available nitrogen forms and nitrogen has been shown to limit productivity in these forests. How photosynthetic capacity (Amax) of tropical trees on the one hand
The late holocene history of vegetation, climate, fire dynamics and human impacts in Java and Southern Kalimantan by Anastasia Poliakova( )

2 editions published between 2015 and 2016 in English and held by 17 WorldCat member libraries worldwide

(Deutsch) Die detaillierte Analyse der Umwelt-, Klima- und Landnutzungsgeschichte in der indonesischen Region ist unumgänglich, um ein besseres Verständnis der Beziehungen zwischen Mensch und Umwelt zu erlangen und desweiteren Ungewissheiten in der zukünftigen Entwicklung der Region vorzubeugen. Indonesien ist einer der Biodiverstitäts-Hotspots und zugleich eines der bevölkerungsreichten Gebiete dieser Erde. Seit historischen Zeiten wurde der Einfluss der menschlichen Aktivität in dieser Region immer intensiver. Daher wurde dieses Projekt ins Leben gerufen, um den Beitrag des Menschen zu de
Changes in eco-hydrological functioning after tropical rainforest transformation to rubber and oil palm plantations by Alexander Röll( )

2 editions published in 2015 in English and held by 17 WorldCat member libraries worldwide

This work presents findings from eco-hydrological research carried out in Jambi, Sumatra, Indonesia in the framework of the CRC990 (Sub-Project A02). Our results point to substantial changes in central ecosystem water fluxes after tropical rainforest transformation to monoculture plantations, which affects the availability of water at the landscape scale and thus impacts on the well-being of rural communities. Rainforest transformation to agricultural systems is generally expected to alter ecosystem water cycles at local and regional scales. Transpiration, i.e. water use by plants, is centr
Experimental biodiversity enrichment in an oil-palm plantation by Anne Gérard( )

2 editions published in 2016 in English and held by 17 WorldCat member libraries worldwide

Large-scale conversion of tropical forests has led to dramatic losses of biodiversity and associated ecosystem services and functions. One particularly severe example of forest and biodiversity loss is Indonesia. The country's exceptionally high biodiversity is seriously threatened by land conversion, for which oil-palm cultivation is a major driver. To increase biodiversity and ecosystem functioning in oil-palm-dominated landscapes, reduced-impact farming systems such as agroforestry systems have been proposed. But in regions where oil-palm plantations already dominate the landscape, this
Effects of moderate Nitrogen and Phosphorus addition on the species composition and dynamics of the three seedlings community in tropical montane forests in southern Ecuador by Dayssy Maritza Cárate Tandalla( )

3 editions published between 2015 and 2016 in English and held by 17 WorldCat member libraries worldwide

Las actividades antropogénicas han producido cambios en los ecosistemas alrededor del mundo. En las regiones tropicales de suramérica, la industrialización de las ciudades y el desmonte de los bosques por medio de quemas son las principales actividades que producen y expulsan contaminantes a la atmósfera e inducen cambios en los patrones de deposición de nutrientes y en el clima de los bosques primarios. El nitrógeno (N) y el fósforo (P) son considerados los principales nutrientes que limitan crecimiento en las plantas ya que su disponibilidad es vital para la cadena de producción primaria
The role of heterogeneity in spatial plant population dynamics by Clara-Sophie van Waveren( )

2 editions published between 2016 and 2017 in English and held by 17 WorldCat member libraries worldwide

Ecological theory names interacting mechanisms that allow competing species to coexist in limited available space, some of them are perceive as antagonistic. Most prominent are niche differentiation, heterogeneity and neutrality (ecological equivalence). Species similarity is also influenced by two mechanisms: Habitat filtering selects for ecologically similar species, while niche differentiation reduces competitive pressure and thus prefers ecologically different species. The spatial arrangement of abiotic resources can determine the spatial pattern and competition framework for a pre-sele
Carbon pools and sequestration in vegetation, litter dynamics and hydraulic anatomic properties in rainforest transformation systems in Indonesia by Martyna Małgorzata Kotowska( )

2 editions published in 2015 in English and held by 17 WorldCat member libraries worldwide

Globally rising demand for cash crops such as oil palm, rubber, and cacao is driving the extensive conversion of natural rainforests in Southeast Asia with increasing speed. The consequences for humans and nature are immense and until today not thoroughly investigated. In the present thesis the impact of natural rainforest conversion into intensively managed rubber and oil palm monocultures, and smallholder rubber and cacao agroforests on carbon storage and sequestration, litter dynamics and hydraulic anatomic properties in Indonesia was assessed and quantified. To fulfill the objectives, c
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.92 (from 0.91 for Effects of ... to 0.93 for Wasser- un ...)

Associated Subjects
Languages
English (33)

German (8)