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A comparison of sap flux-based evapotranspiration estimates with catchment-scale water balance

Many researchers are using sap flux to estimate tree-level transpiration, and to scale to stand- and catchment-level transpiration; yet studies evaluating the comparability of sap flux-based estimates of transpiration (E_{) with alternative methods for estimating E_t at this spatial scale are rare. Our ability to...}

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Author(s):

Chelcy R. Ford; Robert M. Hubbard; Brian D. Kloeppel; James M. Vose

Year:

2007

Keywords:

scaling, sap flux density, sapwood area, transpiration, validation

Source:

Agricultural and Forest Meteorology, Vol. 145: 176-185

Comparison of methods for estimating the spread of a non-indigenous species

Aim: To compare different quantitative approaches for estimating rates of spread in the exotic species gypsy moth, Lymantria dispar L., using county-level presence/absence data and spatially extensive trapping grids. Location: USA. Methods: We used county-level presence/absence records of the gypsy moth?s distribution in the USA, which are available beginning in 1900,...

Author(s):

Patrick C. Tobin; Andrew M. Liebhold; E. Anderson Roberts

Year:

2007

Keywords:

biological invasions, gypsy moth, invasion modelling, invasive species, range expansion, spread

Source:

Journal of Biogeography. 34: 305?312.

Estimation of the spatial autocorrelation function: consequences of sampling dynamic populations in space and time

The estimation of spatial autocorrelation in spatially- and temporally-referenced data is fundamental to understanding an organism's population biology. I used four sets of census field data, and developed an idealized space-time dynamic system, to study the behavior of spatial autocorrelation estimates when a practical method of sampling is employed. Estimates...

Author(s):

Patrick C. Tobin

Year:

2004

Keywords:

Source:

Ecography. 27: 767-775.

Estimating spread rates of non-native species: the gypsy moth as a case study

Estimating rates of spread and generating projections of future range expansion for invasive alien species is a key process in the development of management guidelines and policy. Critical needs to estimate spread rates include the availability of surveys to characterize the spatial distribution of an invading species and the application of analytical methods to...

Author(s):

Patrick Tobin; Andrew M. Liebhold; E. Anderson Roberts; Laura M. Blackburn

Year:

2015

Keywords:

Source:

In: Venette, R.C., ed.; Pest risk modelling and mapping for invasive alien species. Wallingford, UK: CAB International: 131-144. Chapter 9.

Modeling potential evapotranspiration of two forested watersheds in the southern Appalachians

Global climate change has direct impacts on watershed hydrology through altering evapotranspiration (ET) processes at multiple scales. There are many methods to es