Global irrigation contribution to wheat and maize yield

Wang Xuhui, Müller Christoph, Elliot Joshua, Mueller Nathaniel D., Ciais Philippe, Jägermeyr Jonas, Gerber James, Dumas Patrice, Wang Chenzhi, Yang Hui, Li Laurent, Deryng Delphine, Folberth Christian, Liu Wenfeng, Makowski David, Olin Stefan, Pugh Thomas A. M., Reddy Ashwan, Schmid Erwin, Jeong Sujong, Zhou Feng, Piao Shilong. 2021. Global irrigation contribution to wheat and maize yield. Nature Communications, 12:1235, 8 p.

https://doi.org/10.1038/s41467-021-21498-5

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://www.compositerunoff.sr.unh.edu/

Quartile : Outlier, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : Irrigation is the largest sector of human water use and an important option for increasing crop production and reducing drought impacts. However, the potential for irrigation to contribute to global crop yields remains uncertain. Here, we quantify this contribution for wheat and maize at global scale by developing a Bayesian framework integrating empirical estimates and gridded global crop models on new maps of the relative difference between attainable rainfed and irrigated yield (ΔY). At global scale, ΔY is 34 ± 9% for wheat and 22 ± 13% for maize, with large spatial differences driven more by patterns of precipitation than that of evaporative demand. Comparing irrigation demands with renewable water supply, we find 30–47% of contemporary rainfed agriculture of wheat and maize cannot achieve yield gap closure utilizing current river discharge, unless more water diversion projects are set in place, putting into question the potential of irrigation to mitigate climate change impacts.

Mots-clés Agrovoc : rendement des cultures, irrigation, changement climatique, modèle mathématique, modélisation des cultures, modèle de simulation, ressource en eau, Zea mays, eau d'irrigation, culture pluviale, variation saisonnière, plante de culture, hydrologie, augmentation de rendement