Browsing Fakultät für Forstwissenschaften und Waldökologie (inkl. GAUSS) by Advisor & Referee "Knohl, Alexander Prof. Dr."
Now showing items 1-20 of 28
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Oxygen flux simulations as a constraint for carbon fluxes and nitrogen sources in a temperate forest ecosystem
(2024-06-20)The O2:CO2 exchange ratio (ER) between terrestrial ecosystems and the atmosphere is a key parameter for partitioning global ocean and land carbon fluxes. The long-term terrestrial ER is considered to be close to 1.10 mol ... -
Flux measurements at the land-atmosphere interface: Extending the theory and implementation of the true eddy accumulation and eddy covariance measurement techniques
(2023-06-28)Interactions between the biosphere and the atmosphere have profound effects on the global climate and the future trajectory of the Earth system. Understanding the dynamics and controls of these interactions requires ... -
Soil greenhouse gas (N2O, CO2 and CH4) fluxes from cropland agroforestry and monoculture systems
(2022-04-28)Conventional agriculture is the dominant contributor to negative environmental impacts such as the growth in global greenhouse gas (GHG) emissions, and the challenges are likely to increase with the increasing global food ... -
Water vapor, precipitation and evapotranspiration isotopic composition in the tropical atmospheric boundary layer
(2021-04-15)The tropical areas are home to important large-scale climatic phenomena, like the El-Niño Southern Oscillation (ENSO), the Madden-Julian Oscillation (MJO) and the monsoons, that influence the global climate to a large ... -
Carbon Fluxes and Pools in a Montane Rainforest in Sulawesi, Indonesia
(2021-03-18)Forests play an important part in the global carbon cycle. While carbon balances of many forest types have been studied intensively, such information is very sparse for tropical montane rainforests. This thesis aims to ... -
Micrometeorological measurements and numerical simulations of turbulence and evapotranspiration over agroforestry
(2021-03-11)Modern arable agriculture faces major challenges. The increasing occurrence of heat waves and long-lasting droughts leads to excessive loss of soil water, to increased risk for wind and water erosion of soils, and subsequent ... -
Tree and oil palm water use: scaling, spatial heterogeneity and temporal dynamics (Sumatra, Indonesia)
(2020-10-30)Transpiration is a central flux in the terrestrial water cycle and is considered an important ecosystem service for atmosphere and hydrosphere regulation. Transpiration is strongly affected by land cover and land-use ... -
Predicting evapotranspiration from drone-recorded land surface temperatures - Method testing and development
(2020-09-08)Evapotranspiration (ET) is a central flux in the hydrological cycle on a regional and on a global scale. Transpiration from plants is the largest water flux from terrestrial surfaces, accounting for the major part of ... -
Evaluation of Environmental Impacts of Short Rotation Coppice with Regard to the Amount and Quality of Groundwater Recharge
(2020-09-02)While there is broad agreement on the positive environmental impacts of short rotation plantations (SRC), possible negative impacts on groundwater recharge due to potentially high water consumption of trees on arabale land ... -
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
(2020-07-01)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) ... -
Trace gas fluxes from soils and tree stems of rainforests and cacao agroforests in the Congo Basin, Cameroon
(2020-06-11)Tropical rainforests play a crucial role in biogeochemical cycles and global climate dynamics. Yet, research efforts to quantify the main sources and sinks of trace greenhouse gases lags behind that of other biomes. The ... -
Implications of forest structure on carbon dioxide fluxes
(2020-05-07)Forests provide numerous crucial ecosystem services to society that are sensitive to climate and to extreme climate events such as droughts. One of the services of interest is the ability to sequester the greenhouse gas ... -
The effect of neighborhood identity on seasonal tree growth responses and ecophysiological characteristics of European beech (Fagus sylvatica L.)
(2020-01-17)Climate change related rise in mean surface (air) temperature, altered intra-annual thermal and precipitation regimes as well as an expected increase of extreme weather events which are also prognosticated for large parts ... -
An investigation of temporal variability of CO2 fluxes in a boreal coniferous forest and a bog in central Siberia : from local to regional scale
(2019-07-19)Boreal forests and peatlands are the major types of vegetation in northern Eurasia. These ecosystems store large amount of carbon in their vegetation and soil, thus are essential ecosystems to understand the global carbon ... -
The isotopic composition of CO2 and H2Ov fluxes in a managed beech forest - Instrument tests and ecological application of two laser-based absorption spectrometers
(2018-10-10)Stable isotopes provide valuable insights into the coupled carbon dioxide (CO2) and water vapor (H2Ov) cycle on scales ranging from one leaf to global. In particular for applications under field conditions, recent progress ... -
Land use and land cover changes in South East Asia: The effects of land transformations on biophysical variables in Indonesia
(2018-10-01)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 ... -
Water use, storage and transfer in tropical bamboos
(2018-02-02)Bamboos (Poaceae, Bambuseae) are abundant in the natural vegetation of tropical and subtropical regions. They have been used by humans for millennia, and multiple additional bamboo usages have been developed in recent ... -
Measurements of tropical bamboo water use
(2017-04-19)Bamboos are grasses (Poaceae) that are widespread in tropical and subtropical regions. As monocots, woody bamboos have thin-wall hollow culms with abundant parenchyma and the culms are connected by rhizomes. These properties ... -
Oil Palm and Rubber Tree Transpiration: Topography, Flooding and Tree admixture in Jungle Rubber Stands
(2017-03-27)In post-forest plantation landscapes of lowland Sumatra, I studied (1) effects of topography and flooding on transpiration by mono-cultural oil palm and rubber tree plantations, and (2) tree water use rates and tree soil ... -
Consequences of rainforest conversion to smallholder rubber and oil palm plantations on soil trace gas fluxes from highly weathered soils in Sumatra, Indonesia
(2017-01-30)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 ...