Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China
Agricultural water level control is the key to the combined control of water-saving irrigation and controlled drainage. It is easy to observe and master in farmland practice, and has important theoretical and practical significance. In this paper, a systematic study on stomatal regulation and photos...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-12-01
|
Series: | Water |
Subjects: | |
Online Access: | https://www.mdpi.com/2073-4441/10/12/1772 |
id |
doaj-a0b644a9677b474481a0a112d6e66022 |
---|---|
record_format |
Article |
spelling |
doaj-a0b644a9677b474481a0a112d6e660222020-11-24T22:08:52ZengMDPI AGWater2073-44412018-12-011012177210.3390/w10121772w10121772Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern ChinaMenghua Xiao0Yuanyuan Li1Bin Lu2Zimei Miao3Zhejiang Institute of Hydraulics and Estuary, Hangzhou 310020, ChinaSchool of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450045, ChinaState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaAgricultural water level control is the key to the combined control of water-saving irrigation and controlled drainage. It is easy to observe and master in farmland practice, and has important theoretical and practical significance. In this paper, a systematic study on stomatal regulation and photosynthetic-evapotranspiration coupling mechanism, as well as the effect of meteorological environmental factors on photosynthetic-evapotranspiration coupling mechanism of paddy rice in drought and flooding conditions was conducted by taking paddy field’s water level as a regulation indicator of paddy rice’s irrigation and drainage. Results showed that net photosynthetic rate (Pn) and evapotranspiration rate (Tr) had quadratic and linear relationship with stomatal conductance (Gs), respectively. The responding range of Gs in drought condition was lower than that in flooding condition. Drought stress aggravated the photosynthetic stomatal limitation of rice leaves at noon, and partial closure of stomata was the main reason resulting in the reduction of Pn suffering from drought at noon. Change curve of paddy rice’s leaf temperature difference (ΔT) showed a W or V type daily change curve and its change rule was rightly contrary to that of Tr. Pn had quadratic curve relationships with photosynthetically active radiation (PAR) and surrounding CO<sub>2</sub> concentration (Cs) both in the morning and in the afternoon, Pn had quadratic curve relationships in the morning and linear relationships in the afternoon with air temperature (Ta), respectively. Tr showed linear relationships with PAR, Ta, relative air humidity (RH) and barometric pressure saturation deficit (VPD).https://www.mdpi.com/2073-4441/10/12/1772water level regulationphysiological factorsenvironmental factorsregression analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Menghua Xiao Yuanyuan Li Bin Lu Zimei Miao |
spellingShingle |
Menghua Xiao Yuanyuan Li Bin Lu Zimei Miao Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China Water water level regulation physiological factors environmental factors regression analysis |
author_facet |
Menghua Xiao Yuanyuan Li Bin Lu Zimei Miao |
author_sort |
Menghua Xiao |
title |
Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China |
title_short |
Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China |
title_full |
Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China |
title_fullStr |
Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China |
title_full_unstemmed |
Response of Physiological Indicators to Environmental Factors under Water Level Regulation of Paddy Fields in Southern China |
title_sort |
response of physiological indicators to environmental factors under water level regulation of paddy fields in southern china |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2018-12-01 |
description |
Agricultural water level control is the key to the combined control of water-saving irrigation and controlled drainage. It is easy to observe and master in farmland practice, and has important theoretical and practical significance. In this paper, a systematic study on stomatal regulation and photosynthetic-evapotranspiration coupling mechanism, as well as the effect of meteorological environmental factors on photosynthetic-evapotranspiration coupling mechanism of paddy rice in drought and flooding conditions was conducted by taking paddy field’s water level as a regulation indicator of paddy rice’s irrigation and drainage. Results showed that net photosynthetic rate (Pn) and evapotranspiration rate (Tr) had quadratic and linear relationship with stomatal conductance (Gs), respectively. The responding range of Gs in drought condition was lower than that in flooding condition. Drought stress aggravated the photosynthetic stomatal limitation of rice leaves at noon, and partial closure of stomata was the main reason resulting in the reduction of Pn suffering from drought at noon. Change curve of paddy rice’s leaf temperature difference (ΔT) showed a W or V type daily change curve and its change rule was rightly contrary to that of Tr. Pn had quadratic curve relationships with photosynthetically active radiation (PAR) and surrounding CO<sub>2</sub> concentration (Cs) both in the morning and in the afternoon, Pn had quadratic curve relationships in the morning and linear relationships in the afternoon with air temperature (Ta), respectively. Tr showed linear relationships with PAR, Ta, relative air humidity (RH) and barometric pressure saturation deficit (VPD). |
topic |
water level regulation physiological factors environmental factors regression analysis |
url |
https://www.mdpi.com/2073-4441/10/12/1772 |
work_keys_str_mv |
AT menghuaxiao responseofphysiologicalindicatorstoenvironmentalfactorsunderwaterlevelregulationofpaddyfieldsinsouthernchina AT yuanyuanli responseofphysiologicalindicatorstoenvironmentalfactorsunderwaterlevelregulationofpaddyfieldsinsouthernchina AT binlu responseofphysiologicalindicatorstoenvironmentalfactorsunderwaterlevelregulationofpaddyfieldsinsouthernchina AT zimeimiao responseofphysiologicalindicatorstoenvironmentalfactorsunderwaterlevelregulationofpaddyfieldsinsouthernchina |
_version_ |
1725814235277033472 |