Title

Sugarcane Water Productivity Assessments in the São Paulo state, Brazil

DOI

10.14355/ijrsa.2016.06.009

Authors

Antônio H. de C. Teixeira;Janice F. Leivas;Carlos C. Ronquim;Daniel de C. Victoria

Key Words

Remote Sensing ; Evapotranspiration ; Biomass Production ; Water Resources ; Bioenergy Crop

PublicationName

International Journal of Remote Sensing Applications

Volume or Term/Year and Month of Publication

6卷(2016 / 03 / 01)

Page #

84 - 95

Content Language

英文

Chinese Abstract

São Paulo state, Brazil, has been highlighted by the sugarcane crop expansion. The actual scenario of climate and land use changes, bring attention for the large-scale water productivity (WP) analyses. MODIS images were used together with gridded weather data for these analyses. A generalized sugarcane growing cycle inside a crop land mask, from September 2011 to October 2012, was considered in the main growing regions of the state. Actual evapotranspiration (ET) is quantified by the SAFER (Simple Algorithm for Evapotranspiration Retrieving) algorithm, the biomass production (BIO) by the RUE (Radiation Use Efficiency) Monteith's model and WP is considered as the ratio of BIO to ET. During the four generalized sugarcane crop phases, the mean ET values ranged from 0.6 to 4.0 mm day^(-1); BIO rates were between 20 and 200 kg ha^(-1) day^(-1), resulting in WP ranging from 2.8 to 6.0 kg m^(-3). Soil moisture indicators are applied, indicating benefits from supplementary irrigation during the grand growth phase, wherever there is water availability for this practice. The quantification of the large-scale water variables may subsidize the rational water resources management under the sugarcane expansion and water scarcity scenarios.

Topic Category 基礎與應用科學 > 資訊科學