Water for food and nature in drought–prone tropics: vapour shift in rain–fed agriculture

Author:

Rockström Johan1

Affiliation:

1. UNESCO–IHE, PO Box 3015, 2601 DA Delft, The Netherlands

Abstract

This paper quantifies the eco–hydrological challenge up until 2050 of producing food in balance with goods and services generated by water–dependent ecosystems in nature. Particular focus is given to the savannah zone, covering 40% of the land area in the world, where water scarcity constitutes a serious constraint to sustainable development. The analysis indicates an urgent need for a new green revolution, which focuses on upgrading rain–fed agriculture. Water requirements to produce adequate diets for humans are shown to be relatively generic irrespective of hydro–climate, amounting to a global average of 1300 m 3 cap −1 yr −1 . Present food production requires an estimated 6800 km 3 yr −1 of consumptive green water (5000 km 3 yr −1 in rain–fed agriculture and 1800 km 3 yr −1 from irrigated crops). Without considering water productivity gains, an additional 5800 km 3 yr −1 of water is needed to feed a growing population in 2050 and eradicate malnutrition. It is shown that the bulk of this water will be used in rain–fed agriculture. A dynamic analysis of water productivity and management options indicates that large ‘crop per drop’ improvements can be achieved at the farm level. Vapour shift in favour of productive green water flow as crop transpiration could result in relative water savings of 500 km 3 yr −1 in semi–arid rain–fed agriculture.

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3