Browsing by Author "Gurovich, Luis"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Evidence for the transmission of information through electric potentials in injured avocado trees
    (ELSEVIER GMBH, 2011) Oyarce, Patricio; Gurovich, Luis
    Electrical excitability and signaling, frequently associated with rapid responses to environmental stimuli, have been documented in both animals and higher plants. The presence of electrical potentials (EPs), such as action potentials (APs) and variation potentials (VPs), in plant cells suggests that plants make use of ion channels to transmit information over long distances. The reason why plants have developed pathways for electrical signal transmission is most probably the necessity to respond rapidly, for example, to environmental stress factors.
  • Thumbnail Image
    Item
    Impacts of Climate Change on Irrigated Agriculture in the Maipo Basin, Chile: Reliability of Water Rights and Changes in the Demand for Irrigation
    (ASCE-AMER SOC CIVIL ENGINEERS, 2012) Meza, Francisco J.; Wilks, Daniel S.; Gurovich, Luis; Bambach, Nicolas
    Agricultural regions located in snowmelt-dominated Mediterranean climate basins have been identified as being highly vulnerable to the impacts of climate change. The Maipo basin in central Chile is one such region. Projections of future climate conditions suggest major challenges for this basin. Precipitation levels are projected to decrease by the end of the century, and temperature levels in the mountains are expected to increase by around 3-4 degrees C. Such changes would affect both river discharge and irrigation water demand. This paper illustrates potential climate change impacts on the hydroclimatological regime of the Maipo basin, focusing on irrigated agriculture and its demands on water use rights. The impact assessment was carried out by combining a multisite stochastic weather generator with a disaggregation technique for historical monthly flows of the Maipo river at El Manzano. Demand for irrigation was simulated with a daily water budget model. Data showed that water demands from irrigated agriculture tend to increase as a consequence of the simulated changes in temperature and precipitation. The magnitudes of these changes depend on crop types and their prevalence in the region. It was concluded that the reliability of water allocations under the current water rights system may be strongly negatively affected. In particular, projected hydrological impacts for the climate change scenario considered indicate that the 15th percentile currently used as the basis for water rights may become the 40th or 50th percentile in the future, suggesting that present water allocations will become overcommitted. DOI: 10.1061/(ASCE)WR.1943-5452.0000216. (C) 2012 American Society of Civil Engineers.