MARC 主機 00000nam  2200337   4500 
001    AAI3320233 
005    20100405100815.5 
008    100405s2008    ||||||||||||||||| ||eng d 
020    9780549721840 
035    (UMI)AAI3320233 
040    UMI|cUMI 
100 1  Duesterhaus, Jamey L 
245 12 A micrometeorology study of stock watering ponds, 
       rangelands, and woodlands in the Flint Hills of Kansas 
300    133 p 
500    Source: Dissertation Abstracts International, Volume: 69-
       08, Section: B, page: 4501 
500    Adviser: Jay Ham 
502    Thesis (Ph.D.)--Kansas State University, 2008 
520    Land management practices such as burning and grazing may 
       affect evapotranspiration (ET) and water balance of the 
       tall grass prairie in the Flint Hills of eastern Kansas. 
       Experiments were designed to estimate or measure the water
       balance of a stock-watering pond, and compare energy 
       balance parameters and ET between grazed and ungrazed 
       prairies. The hydrology of the native tallgrass prairie 
       also was compared with mature stand of eastern red cedar 
       (Juniperus virginiana), a site that was formerly prairie 
       but converted to woodland when prescribed burning was 
       discontinued. Data were collected to encompass the 
       seasonal and yearly changes in weather variability. A host
       of micrometeorological sensors were used to measure 
       surface atmosphere exchange and water losses, including: 
       eddy covariance towers on prairie and woodland sites, 
       specialized throughfall and stem flow equipment at the 
       woodland site, and an instrumentation raft at the stock-
       watering pond. Results of the stock pond study showed that,
       on average, evaporation accounted for 64% of the water 
       loss, followed by seepage at 31%, cattle use at 3% and 
       transpiration at 2%. Comparisons of grazed and ungrazed 
       areas showed that grazing caused only small, 3 to 6%, 
       reductions in seasonal ET compared with ungrazed pastures 
       despite large differences in vegetative cover. In the 
       woodland study, the 50-yr-old cedar canopy intercepted 54%
       of the precipitation received, thus decreasing the amount 
       of precipitation reaching the soil. Evapotranspiration 
       from woodland and prairie sites were similar, but net 
       carbon exchange was greater on the prairie. Thus, the 
       apparent water use efficiency during the summer months was
       3 times greater on the prairie. Net radiation at the 
       woodland site was 100 W m-2 higher compared with the 
       prairie. This caused an increase in the woodland sensible 
       heat flux and midday Bowen ratios, yet woodland latent 
       heat flux and ET was similar to the prairie during the 
       study, factors that could affect regional climate. Land 
       management decisions regarding grazing, prescribed burning,
       and stock pond design will impact the watershed hydrology 
       and productivity of the tallgrass prairie 
590    School code: 0100 
650  4 Agriculture, Range Management 
690    0777 
710 2  Kansas State University.|bDepartment of Agronomy 
773 0  |tDissertation Abstracts International|g69-08B 
856 40 |u