An Estimation of Global Agricultural Water Demand Including Spatial Distribution of Crop Species

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  • 多様な作物分布を考慮した全球農業水需要量推定
  • シンポジウム論文 多様な作物分布を考慮した全球農業水需要量推定
  • シンポジウム ロンブン タヨウ ナ サクモツ ブンプ オ コウリョ シタ ゼン キュウ ノウギョウスイ ジュヨウリョウ スイテイ

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Abstract

This paper shows an estimation of global agricultural water demand including spatial distribution of crop species. Since agriculture accounts for 85 % of world water usage, methods for estimating the requirements of irrigation water are strongly desired for agricultural water resources management. Using a hydrological land surface model and taking into consideration different crop species, we estimated the water demand of irrigation activities. Cropping calendars for five types of crops (rice, wheat, soybean, maize and cotton) were specified by phenological analysis of NDVI. Statistical data of crop types and irrigated land were merged in a global map of irrigated areas in order to set the fraction of irrigated land for each type of crop. The main results are: i) In many countries, the analyzed annual water demand corresponds to statistical data, and large amounts of water are required in Asia, North America and Europe. ii) Water demand for agriculture is governed by three main factors: crop types, soil physical properties and climate conditions. Of the five types of crops, rice requires the biggest amount of water while cotton requires the least under the same conditions of precipitation. Finally, it was proven that our method can consider the differences between crop types and is useful for agricultural water resources management at basin scale.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 26 (2), 158-166, 2013

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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