Field Experiment on Crop Evapotranspiration Measurements via Lysimeters With Different Scales

doi:10.3969/j.issn.1000-6362.2015.02.006

Abstract

Abstract: Weighting lysimeters are standard techniques for the measurement of crop evapotranspiration （ET） but application of large scale lysimeters to deal with the repeated experiments with different treatments is of some difficulties due to their installation method with single unit. Lysimeters with small scales are suitable to settle this problem， yet the feasibility of them is still an ongoing topic of research. In this study， lysimeters with area scales of 1m2（Small scale Lysimeters， SL）， 2m2（Middle scale Lysimeters， ML） and 4m2（Large scale Lysimeters， LL） were applied for continuous measurement of ET in entire growing season of winter wheat （sowed on Nov.21， 2012 and harvested on Jun.20， 2013） and rice （transplanted on Jun.22， 2013 and harvested on Oct.28， 2013）. ET measured on norainfall days was then analyzed for the feasibility comparison of lysimeters with different scales. Results indicated that （1） diurnal variation of ET with large fluctuations was observed by SL in the growing season of winter wheat and rice while relatively stable variations by ML and LL and their variation trends were consistent. （2） Correlation relationship between Daily ET from ML and LL was much more significant than the correlations between that from SL and LL. （3） SL could be applied to monitor the total and mean daily ET in rice growing season since the observed daily ET from SL were almost equal to that from LL. However， daily ET observed by ML in the growing season both of winter wheat and rice were lower than that by LL due to the lower ET observed after jointing stage for the two crops．

Key words: Small scale lysimeters, Evapotranspiration, Field experiment, Winter wheat, Rice

YANG Bingyu， SHEN Shuanghe， ZHANG Fucun， TAO Sulin， WANG Xiumin， ZHAO Hua. Field Experiment on Crop Evapotranspiration Measurements via Lysimeters With Different Scales[J]. Chinese Journal of Agrometeorology, 2015, 36(02): 161-169.

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