Canopy Temperature Response to the Paddy Water Content and Its Relationship with Fluorescence Parameters and Dry Biomass
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FULL-LENGTH RESEARCH ARTICLE
Canopy Temperature Response to the Paddy Water Content and Its Relationship with Fluorescence Parameters and Dry Biomass Ennan Zheng1,2
•
Chao Zhang3 • Zhijuan Qi1,2 • Zhongxue Zhang1,2
Received: 6 September 2019 / Accepted: 23 December 2019 Ó NAAS (National Academy of Agricultural Sciences) 2020
Abstract In order to study the canopy temperature response to the paddy water content and its relationship with fluorescence parameters and dry biomass, and to investigate a suitable water management method with higher efficiency utilization of water for rice growth in cold region and black glebe, in northeast China, an experiment with three water treatments [control irrigation (CI), wet irrigation and flood irrigation (FI)] was performed in year 2017 and in year 2018 at the National Key Irrigation Experimental Station located in Heping Town, Qing’an County, Suihua, Heilongjiang, China. The results showed that the average of the canopy temperature was lower than atmosphere temperature. However, there was no significant difference among the three water treatments. Under CI treatment, the daily variation of canopy temperature was higher than atmosphere temperature from 11:00 to 15:00 o’clock at heading stage, indicating the water stress appeared at this time. The correlation analysis was found that the canopy temperature had no effects on Fv/Fm, QP and dry biomass growth rate, and the highest values of Fv/Fm, QN and the dry biomass growth rate were recorded in FI treatment. Therefore, based on the results of this experiment during the 2 years, it could provide some reference and theoretical support for the water management, in cold region and black glebe, in northeast China. Keywords Rice Water treatments Fluorescence Dry biomass growth rate Meteorological factors
Introduction The cold region and black glebe, an important national commodity grain and food safety base, is the largest supply base of rice production, in northeast China [25]. Its grain production plays an important role in alleviating grain
& Zhijuan Qi [email protected] & Zhongxue Zhang [email protected] 1
Collage of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China
2
Key Laboratory of Effective Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin 150030, China
3
Zhejiang Tongji Vocational College of Science and Technology, Hangzhou 3211231, China
security issues [24]. From 2005 to 2015, grain production accounts for the national proportion increased from 18.9 to 22.9% in this region [19], which was important for guaranteeing grain security. In recent years, rice planting area is extending, so the water consumption is also increased. However, well-irrigated rice accounts for most of the paddy planting area and more than 70% of the regional agricultural water consumption [4, 11, 14, 23]. Rice growth was effected by non-biological adversity such as flooding, high-temperature or low-temperature stress [3, 9, 29]; especially, high-temperature weath
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