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Water 2016, 8(3), 72; doi:10.3390/w8030072

Partitioning of Cotton Field Evapotranspiration under Mulched Drip Irrigation Based on a Dual Crop Coefficient Model

1
Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2
Power China Kunming Engineering Corporation Limited, Kunming 650000, China
*
Author to whom correspondence should be addressed.
Academic Editors: Magaly Koch and Thomas M. Missimer
Received: 7 December 2015 / Revised: 14 February 2016 / Accepted: 17 February 2016 / Published: 25 February 2016
(This article belongs to the Special Issue Water Resources Assessment and Management in Drylands)
View Full-Text   |   Download PDF [2975 KB, uploaded 25 February 2016]   |  

Abstract

Estimation of field crop evapotranspiration (ETc) and its partitioning into evaporation and transpiration, are of great importance in hydrological modeling and agricultural water management. In this study, we used a dual crop coefficient model SIMDualKc to estimate the actual crop evapotranspiration (ETc act ) and the basal crop coefficients over a cotton field in Northwestern China. A two-year field experiment was implemented in the cotton field under mulched drip irrigation. The simulated ETc act is consistent with observed ETc act as derived based on the eddy covariance system in the field. Basal crop coefficients of cotton for the initial, mid-season, and end-season are 0.20, 0.90, and 0.50, respectively. The transpiration components of ETc act are 96% (77%) and 94% (74%) in 2012 and 2013 with (without) plastic mulch, respectively. The impact of plastic mulch cover on soil evaporation is significant during drip irrigation ranging from crop development stage to mid-season stage. The extent of the impact depends on the variation of soil moisture, available energy of the soil surface, and the growth of the cotton leaves. Our results show that the SIMDualKc is capable of providing accurate estimation of ETc act for cotton field under mulched drip irrigation, and could be used as a valuable tool to establish irrigation schedule for cotton fields in arid regions as Northwestern China. View Full-Text
Keywords: SIMDualKc model; dual crop coefficient; eddy covariance; plastic mulch SIMDualKc model; dual crop coefficient; eddy covariance; plastic mulch
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tian, F.; Yang, P.; Hu, H.; Dai, C. Partitioning of Cotton Field Evapotranspiration under Mulched Drip Irrigation Based on a Dual Crop Coefficient Model. Water 2016, 8, 72.

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