WorldCat Identities

Veldkamp, Edzo

Overview
Works: 26 works in 43 publications in 2 languages and 309 library holdings
Genres: Academic theses 
Roles: dgs, Other, Author
Publication Timeline
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Most widely held works by Edzo Veldkamp
Trace Gas Fluxes from Tropical Montane Forests of Southern Ecuador by Guntars Olivers Martinson( )

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

Grassland Management and Diversity Effects on Soil Nitrogen Dynamics and Losses by Ina Hoeft( )

2 editions published between 2012 and 2013 in English and held by 23 WorldCat member libraries worldwide

Grünland spielt eine große Rolle in der Landnutzung und nimmt ein Drittel der landwirtschaftlich genutzten Fläche von Europa ein. Als Konsequenz der Intensivierung landwirtschaftlicher Bewirtschaftungsmaßnahmen der letzten 60 Jahre nahm die Produktivität des Grünlands zu während die Diversität dieser Systeme abnahm. In Grünland-Ökosystemen spielt Stickstoff (N) eine Schlüsselrolle - N bedingt die Primärproduktion und beeinflusst die Biodiversität. Zudem kann eine steigende N-Verfügbarkeit gasförmige Emissionen, wie z.B. Distickstoffoxid (N2O) und Stickstoffmonoxid (NO) fördern, die eine gro
Nitrogen response efficiency, nitrogen retention efficiency, and asymbiotic biological nitrogen fixation of a temperate permanent grassland site under different sward compositions and management practices by Andreas Keuter( )

2 editions published in 2013 in English and held by 23 WorldCat member libraries worldwide

Human activity had a huge impact on the global nitrogen (N) cycle in the last decades, mainly through an increase in the production of reactive N. In European grasslands, the increased use of N fertilizers was accompanied by increased mowing frequencies. This agricultural intensification made grasslands important sources of N losses and caused a decrease in biodiversity. Minimizing N losses and maintaining both soil quality and high yields at the same time is an important challenge in grassland management. This can be achieved through 1) an efficient retention of soil available N in the pla
Effects of nutrient cycling through litter of different broadleaved deciduous tree species on soil biochemical properties and the dynamics of carbon and nitrogen in soil by Christina Langenbruch( )

2 editions published between 2012 and 2013 in English and held by 23 WorldCat member libraries worldwide

Tree species influence soil chemical properties via the input of nutrients and protons through throughfall, stemflow, litterfall, and root respiration and/ or exudation. The effect of conifers versus hardwood trees on soil properties, such as beech (Fagus sylvatica L.), has often been investigated. More recent studies have focused on the influence of different broadleaved tree species on soil properties, and it was found that different broadleaved tree species may significantly influence soil properties, such as the C and N storage. However, most studies compared different mono-species stan
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

In den letzten zwei Jahrzehnten wurden in Sumatra (Indonesien) große Regenwaldflächen für den Anbau von Kautschuk- und Palmölplantagen zerstört. Dies zeigt sich in der Abnahme Waldfläche in dieser Region um 36% zwischen 1990-2010. Eine solch schnelle Landnutzungsänderung hat Auswirkungen auf die Umwelt: Es ist davon auszugehen, dass die Zerstörung von Regenwald und die Etablierung von Kautschuk- und Palmölplantagen aufgrund von Einflüssen auf die Bodenoberfläche, Veränderungen von Streufall, Nährstoffverfügbarkeit und Management in den Plantagen zu erhöhter Nährstoffauswaschung und einer ve
Gross N2O fluxes across soil-atmosphere interface and stem N2O emissions from temperate forests by Yuan Wen( )

2 editions published in 2017 in English and held by 20 WorldCat member libraries worldwide

Obwohl Distickstoffmonoxid (N2O) zu den Nebenbestandteilen der Atmosphäre zählt, ist es doch von großer Bedeutung. Es hat signifikanten Einfluss auf die Physik und Chemie der Atmosphäre und beeinflusst damit das Klima auf der Erde. Der Boden ist eine wichtige N2O-Quelle, mit mikrobieller Nitrifikation und Denitrifikation als bestimmende Prozesse der N2O-Produktion. Boden-N2O-Flüsse zeigen gewöhnlich hohe räumlich-zeitliche Variabilität, denn mikrobielle Prozesse von N2O-Produktion und -Verbrauch sind jeweils von der Substratverfügbarkeit, dem Redoxpotential und der Temperatur abhängig. Auch
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
Nutrient response efficiency, tree-microbe competition for nutrients and tree neighborhood dynamics in a mixed-species temperate deciduous forest in central Germany by Marcus Schmidt( )

2 editions published in 2015 in English and held by 19 WorldCat member libraries worldwide

In most Central European countries, less than one percent of the remaining broadleaved forest is undisturbed and temperate forests face challenges such as species invasion, climate change and increased nitrogen deposition. High N deposition has been shown to alleviate N limitation, inhibit P uptake and cause deficiencies in leaf P status of beech. Tree species diversity may increase stand productivity in temperate forests through complementary resource use and/or facilitation of a limiting nutrient. The passage of nutrients through microbial biomass during decomposition is a key process in
Soil organic carbon dynamics in pastures established after deforestation in the humid tropics of Costa Rica by E Veldkamp( Book )

5 editions published in 1993 in English and held by 19 WorldCat member libraries worldwide

With this model, the observed changes in soil organic carbon and corresponding delta 13C levels during the conversion from a humid tropical forest to a cattle pasture were simulated successfully for the two soil types
Consequences of rainforest conversion to smallholder rubber and oil palm plantations on soil trace gas fluxes from highly weathered soils in Sumatra, Indonesia by Evelyn Hassler( )

3 editions published between 2016 and 2017 in English and held by 18 WorldCat member libraries worldwide

In Sumatra, Indonesia, the establishment of oil palm and rubber plantations is widespread. However, it occurs at the expense of forest area. Since global demand for palm oil and rubber is increasing, forest conversion is expected to continue. Furthermore, studies have shown that forest destruction and the establishment of agricultural land uses influence the soil-atmosphere exchange of the climate-relevant trace gases carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and nitric oxide (NO). Nevertheless, trace gas measurements from oil palm and rubber plantations are scarce. Additiona
Soil greenhouse gas fluxes under elevated nutrient input along an elevation gradient of tropical montane forests in southern Ecuador by Anke Katrin Müller( )

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

Tropische Waldböden spielen für das Klima der Erde eine wichtige Rolle, da sie große Mengen an Treibhausgasen (THGs) mit der Atmosphäre austauschen. Diese wichtige Funktion könnte jedoch durch menschliche Aktivitäten verändert werden, da sie atmosphärische Nährstoffeinträge vor allem in tropischen Regionen erhöhen. Wie ansteigende Nährstoffeinträge THG Flüsse von tropischen Waldböden beeinflussen wurde jedoch bisher kaum untersucht und Nährstoff-Kontrollmechanismen in tropischen Bergregenwäldern (TBRWs) sind noch viel weniger verstanden. Nachdem TBRW-Böden ungefähr 11-21% der tropischen Wal
Canopy soil nutrient cycling and response to elevated nutrient levels along an elevation gradient of tropical montane forests by Amanda Matson( )

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

Obwohl Böden des Kronendachs (canopy soils) deutlich zur oberiridischen labilen Biomasse beitragen können, werden sie oft in Studien über Nährstoffkreisläufe übersehen. In Wäldern mit einem großen Vorkommen an Böden im Kronendach, wie beispielsweise jene in tropischen Bergregionen, könnte dies zu einem unvollständigen Verständnis der Gesamt-Nährstoffprozesse des Waldes beitragen. Böden im Kronendach sind Ansammlungen organischen Materials, welche gewöhnlich auf Zweigen von Bäumen tropischer Wälder zu finden sind. Sie bestehen in erster Linie aus zersetztem epiphytischen Material aber umfass
Impacts of land use and biophysical properties on soil carbon stocks in southern Yunnan, China by Marleen de Blécourt( )

1 edition published in 2013 in English and held by 14 WorldCat member libraries worldwide

Für die montanen Regionen kontinental Südostasiens (Südwest China, Laos, Kambodscha, Myanmar, Nordost Thailand, Nordwest Vietnam) gibt es nur wenig Informationen über die organische Bodensubstanz (OBS) und ihre Beeinflussung durch Landnutzung, Bewirtschaftung und biophysikalische Eigenschaften. Zum Beispiel ist trotz großflächiger Entwaldung zu Gunsten von Kautschukplantagen der Einfluss dieser Landnutzungsänderung auf OBS Vorräte kaum bekannt. Auch wurde der Einfluss der Terrassierung, wie sie für den Kautschukanbau in montanen Regionen üblich ist, auf die Dynamik der OBS bislang nicht unt
Trace gas fluxes and belowground carbon allocation in tropical montane forest soils of Southern Ecuador = Spurengasflüsse und unterirdische Kohlenstoffspeicherung in den Böden tropischer Bergregenwälder Südecuadors by Katrin Wolf( )

1 edition published in 2011 in English and held by 14 WorldCat member libraries worldwide

Tropical forest soils are important sources of the greenhouse gases carbon dioxide (CO2) and nitrous oxide (N2O), and of nitric oxide (NO), a precursor of ozone production. They are also sinks for the greenhouse gas methane (CH4). Estimates on soil trace gas fluxes and on carbon cycling from tropical forest soils are heavily biased towards lowland forests. Limited data is available on trace gas exchange from tropical montane forest (TMF) soils and their carbon cycle has only been marginally explored, although TMFs cover approximately 9% of the tropical forest area. This dissertation presents the results of a comprehensive study on soil CO2, N2O, NO, and CH4 exchange and possible biogeochemical regulators, with a special focus on the influence of nutrient availability in TMFs of southern Ecuador. Soil CO2, N2O and CH4 fluxes were determined using static closed chambers and gas chromatographic analysis at three sites along an elevation gradient from 1000 m to 3000 m (1000 m, 2000 m, 3000 m) and along topographic gradients (lower slope, midslope, ridge), . NO fluxes were measured in the field using open dynamic chambers and a LMA-3D NO2 Analyzer with chemiluminescence detection. To determine the potential atmospheric CH4 uptake of different soil substrates, a laboratory incubation experiment using organic
Origin and regulation of soil N2O and NOx fluxes from coniferous and deciduous temperate forests exposed to chronic high N depositions by Nadine Eickenscheidt( )

1 edition published in 2012 in English and held by 13 WorldCat member libraries worldwide

Nitrogen (N) cycling in Europe and in many other parts of the world has been massively accelerated as a result of agricultural and industrial activities in the last decades. As a consequence, forest ecosystems have been exposed to increasing deposition rates of reactive N, which may increase soil N availability. Increased N availability in turn may alter nitrous oxide (N2O) and nitric oxide (NO) emissions, which play a major role in atmospheric chemistry and contribute to global warming. Several studies reported that European temperate forests receiving chronic high N depositions are important sources for N2O and NO. Despite high research efforts in the last two decades, there is still insufficient knowledge about the importance of N depositions and forest type on N oxide fluxes from temperate forest soils. Therefore, the objectives of the present study were (i) to investigate the origin of N oxide emissions from temperate forest soils exposed to chronic high N depositions and to quantify the contribution of N depositions and turnover of leaf litter N to N2O emissions and (ii) to determine the factors that regulate N oxide fluxes in temperate forest soils with special regard to the impact of forest type and soil gas diffusivity
Tropical forest conversion to rubber and oil palm plantations landscape-scale and inter-annual variability of soil greenhouse gas (GHG) fluxes and the contribution of tree-stem emissions to the soil GHG budget in Jambi province, Sumatra, Indonesia by Josephus Adrianus Koks( Book )

1 edition published in 2020 in English and held by 4 WorldCat member libraries worldwide

Deforestation rates have rapidly increased over the last two decades in Sumatra, Indonesia, where large areas of lowland rainforest have now been converted into the monoculture plantation types of oil palm (Elaeis guineensis) and rubber (Hevea brasiliensis). The high global demand for palm oil and latex is continuously pushing expansion of this forest-to- plantation conversion and might even increase in the next decades. Land-use conversion is known to influence the soil-atmosphere exchange of the climate-relevant greenhouse gases (GHG) nitrous oxide (N2O), methane (CH4) and carbon dioxide
The environmental impact of selective logging in southern Cameroon: soil disturbance, nutrient budget and greenhouse gas fluxes by Rodine Tchiofo Lontsi( Book )

2 editions published between 2019 and 2020 in English and held by 4 WorldCat member libraries worldwide

Tropische Wälder spielen eine wichtige Rolle im Klimaschutz aufgrund der Speicherung von Kohlenstoff in der Vegetation und im Boden, welcher durch Abholzung und Waldschädigung an die Atmosphäre freigesetzt werden kann. Einer der Haupttreiber der Zerstörung tropischer Wälder ist der selektive Holzeinschlag, der in den Tropen die häufigste Holzerntepraxis darstellt. Beim selektiven Holzeinschlag in Kamerun werden nur Bäume von wirtschaftlich wichtigen Arten geerntet, die den von der Forstverwaltung festgelegten Mindestdurchmesser in Brusthöhe erreicht haben. Im Allgemeinen wird weniger als ei
Nitrous oxide emissions from stems of alder, beech and spruce in a temperate forest by Yuan Wen( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Stem and soil nitrous oxide fluxes from rainforest and cacao agroforest on highly weathered soils in the Congo Basin by Najeeb Al-Amin Iddris( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

An in-depth look into a tropical lowland forest soil: nitrogen-addition effects on the contents of N2O, CO2 and CH4 and N2O isotopic signatures down to 2-m depth by Birgit Koehler( )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

 
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Audience level: 0.91 (from 0.81 for Soil organ ... to 0.97 for Soil organ ...)

Languages
English (36)

German (1)