A temporal analysis of the consequences of the drought regime on the water footprint of agriculture in the Guadalupe Valley, Mexico
Vanessa Novoa, Carolina Rojas, Octavio Rojas, Ramón Ahumada-Rudolph, Rebeca Moreno-Santoyo
Abstract
Abstract Changes in water availability have a substantial impact on the sustainability and maintenance of agriculture, with water footprint (WF) being a robust methodology to assess these transformations. The Guadalupe Valley is one of the places with the highest agricultural production in Mexico. Despite its semi-arid climatic conditions, it provides high-quality crops that are well-positioned in the world. The historical trend of rainfall and temperatures between 1987 and 2017 was analyzed to identify climatic patterns in the territory. Through the calculations of the water footprint of Grapevine and Olive crops, the sensitivity of the crops to recurrent water deficit and their adaptation in their yields to drought episodes was identified. The reduction in precipitation and occurrence of extreme temperatures have contributed significantly towards augmenting crop evapotranspiration and, consequently, intensifying crop irrigation demands. As a result, there has been an apparent increase in the consumption of WF agricultural since 2007. Thus, the period of highest WF agricultural consumption was 2014 (Extremely dry), as opposed to 2011 (Very wet). In particular, the lowest WF green consumptions were observed in extremely dry years, that is, > 20% of the WF agricultural intensifying drought events. Therefore, these periods were compensated with higher uses of WF blue and WF gray , which are inversely correlated with precipitation, where vine crops consume 73% more WF agricultural compared to olive plantations, showing greater interannual variability. These results contribute to analyzing the temporal evolution of water consumption for agriculture, providing a basis for rational water use strategies.