University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Kuenzang Om
(2016):
HYDROLOGICAL CHARACTERIZATION OF TWO MOUNTAIN ECOSYSTEMS IN BHUTAN.
Master / Diploma Thesis - Institut für Waldökologie (IFE),
BOKU-Universität für Bodenkultur,
pp 93.
UB BOKU
obvsg
- Abstract:
- The main objective of the study was to provide soil and stand hydrological information for data-driven simulations of the ecosystem water balance for two forest types in Bhutan. The study was conducted as part of throughfall exclusion experiments which took place in Pangsho Goempa (PG), a warm temperate broadleaved forest zone and Tashigang Goempa (TG), a cool temperate conifer forest zone. At each site four homogeneous plots of 725 m2 (two control and two throughfall exclusion plots) were selected. An integral part of the investigation was the hydrological characterization of the soil at the sites. Soils of the study sites were described in the field, while hydraulic conductivity, volumetric water content – matrix potential relationships, organic carbon content, texture and clay mineralogy were measured for different horizons of characteristic profiles in the laboratory. Climatic drivers were recorded by on-site climate stations, with stand throughfall and stemflow sampled in ca. 3-week intervals from July 2014 to December 2015. Field measurements of soil water contents were gathered in high temporal resolution over soil depth at selected locations. BROOK 90, a hydrological model was used for the simulation of the water balance at stand level. Input parameters were determined from site measurements (leaf area index, soil), taken from literature (canopy conductance), or provided by the project partners (stand structure and root distribution). The soil type at TG is Cambisol and Luvisol at PG. The plant available soil water content ranged from 15 - 25 % at TG with high variation, compared to 20-30 % at PG where the variation was smaller. At TG, evapotranspiration (ET) accounts to 34 % of the total precipitation (1186 mm), 66 % runoff including seepage & surface flow and small negative change in soil water storage. At PG, 40 % of the precipitation (1123 mm) was evaporated or transpired, with 59 % runoff and 0.46 % change in soil water storage.
- Beurteilende(r): Katzensteiner Klaus
- 1.Mitwirkender: Matthews Bradley
- 2.Mitwirkender: Wriessnig Karin