Methods for the precise control of drought stress have been a holy grail of plant biology research. Here we describe a five-container growth chamber system and a 16-container greenhouse system, each of which uses load cells to monitor and control the mass of a soil/plant system. The calibration and signal conditioning necessary to quantify transpiration over 10 minute intervals is described. Ev...

A semidistributed, physical-based Urban Forest Effects – Hydrology (UFORE-Hydro) model was created to simulate and study tree effects on urban hydrology and guide management of urban runoff at the catchment scale. The model simulates hydrological processes of precipitation, interception, evaporation, infiltration, and runoff using data inputs of weather, elevation, and land cover along with nin...

In this research, amount of evaporation and transpiration and water requirement of wheat plant for Marvdasht town (representation station: Zaraghan) during 17-years statistical duration from 1989-2005 and properties of plant and soil are calculated using CROPWAT software. At the first, trends of dry and wet periods for mentioned station were determined using long-term average of climatic data (...

In this research, amount of evaporation and transpiration and water requirement of wheat plant for Marvdasht town (representation station: Zaraghan) during 17-years statistical duration from 1989-2005 and properties of plant and soil are calculated using CROPWAT software. At the first, trends of dry and wet periods for mentioned station were determined using long-term average of climatic data (...

[1] We conducted a modeling study to evaluate how soil hydrological properties regulate water and carbon dynamics of grassland ecosystems in response to multifactor global change. We first calibrated a process-based terrestrial ecosystem (TECO) model against data from two experiments with warming and clipping or doubled precipitation in Great Plains. The calibrated model was used to simulate re...

GLEAMS (Leonard et al., 1987; Knisel et al., 1992; Knisel, 1993) is a continuous, field-scale hydrology and chemical transport model like Opus, simulating the transport and transformations of nutrients and pesticides in the root zone and in surface runoff. It runs on a daily time step, using daily rainfall information. GLEAMS uses a modification of the SCS Curve Number method (William and La Se...

[1] Using a simple dynamic vegetation model coupled to an intermediate complexity climate model Kleidon [2004] suggests that an optimum stomatal conductance exists at which vegetation productivity is maximized. It is suggested that this maximum is the result of two competing processes: 1) the increased supply of CO2 with increased stomatal conductance and 2) increased cloud cover, associated wi...