Estimation of Evapotranspiration and Crop Coefficient of Chinese Cabbage Using Eddy Covariance in Northwest China

Jie, Ding; Li, Sien; Wang, Hongshuo; Wang, Chunyu; Zhang, Yunxuan; Yang, Danni

doi:10.3390/w13192781

Cited by 7 publications

(3 citation statements)

References 31 publications

(37 reference statements)

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“…The region has a typical temperate continental climate, with a multi-year average precipitation of about 164.4 mm, which is mostly concentrated in July−September. The annual cumulative temperature (>0 • C) is about 3550 • C, the average annual sunshine duration is about 3000 h, the average annual pan evaporation is about 2000 mm [30], and the average depth of groundwater is about 25 m. The area has a high elevation, satisfying light and heat resources, and sufficient irrigation, which is suitable for growing cabbages and other vegetable crops [31]. The locations of the experimental station, observation instruments, and the cabbage field are shown in Figure 1.…”

Section: Study Areamentioning

confidence: 99%

“…where λET and H are the latent and sensible heat flux (W m −2 ), w ′ q ′ is the covariance between fluctuations of vertical wind speed w ′ (m s −1 ) and humidity q ′ (kg kg −1 ), w ′ T ′ is the covariance between fluctuations of w ′ and sonic temperature T ′ (K), ρ a is the air density (kg m −3 ), C p the specific heat of dry air at constant pressure (J kg −1 K −1 ), λ the latent heat of water vaporization (J kg −1 ), and ET is the crop evapotranspiration (kg m −2 s −1 ) [31].…”

Section: Eddy Correlation Systemmentioning

confidence: 99%

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Driving Factors and Numerical Simulation of Evapotranspiration of a Typical Cabbage Agroecosystem in the Shiyang River Basin, Northwest China

Yang,

Yu,

et al. 2024

Agriculture

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Two years of field experiments were conducted at the National Field Observation Experiment Station for Efficient Agricultural Water Use in the Wuwei Oasis, Gansu Province. Based on the eddy correlation system, the evapotranspiration (ET) of the cabbage agroecosystem during the growth period was obtained and the main driving factors of ET changes were determined. The Root Zone Water Quality Model 2.0 version (RZWQM2 model) was used to simulate ET during the growth period. The results showed the following: (1) The ET of cabbage during the growth period was 260. 1 ± 24.2 mm, which was basically lower than other crops planted in this area. (2) Through partial correlation analysis and principal component analysis, it can be found that environmental and physiological factors jointly drive changes in ET. The main driving factors include gross primary productivity, net radiation, and water use efficiency. (3) The RZWQM2 model can simulate the ET of the cabbage agroecosystem well, especially in simulating the total ET value and its trend. The growth period ETs were 7.3% lower than the ETm. Cabbage is an important cash crop in Northwest China, and ET is an important component of the water cycle in the agroecosystem. Determining the main driving factors of ET is of great significance for the sustainable utilization of agricultural water resources in Northwest China. Our results can provide a scientific basis for the cultivation of cabbage as a cash crop and the development of water saving agriculture.

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Section: Study Areamentioning

confidence: 99%

Section: Eddy Correlation Systemmentioning

confidence: 99%

Driving Factors and Numerical Simulation of Evapotranspiration of a Typical Cabbage Agroecosystem in the Shiyang River Basin, Northwest China

Yang,

Yu,

et al. 2024

Agriculture

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“…The conventional approach to estimating ET C in saline coastal farmlands is subject to many limitations and uncertainties. The observation methods at the farm scale include the lysimeter method [ 9 , 10 ], the Bowen ratio method [ 11 , 12 ], the eddy covariance method [ 13 , 14 ], etc. However, because soil salinity in coastal farmlands leads to erosion and degradation of the sensors and other parts of monitoring equipment, the accuracy and reliability of the data collected can be limited.…”

Section: Introductionmentioning

confidence: 99%

Irrigation Optimization via Crop Water Use in Saline Coastal Areas—A Field Data Analysis in China’s Yellow River Delta

Liu

Zhang

et al. 2023

Plants

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Freshwater resources are becoming increasingly scarce in coastal areas, limiting crop productivity in coastal farmlands. Although the characteristic of crop water use is an important factor for water conservation in coastal farmlands, it has not been studied extensively. This study aimed to depict the water use process of soil–plant systems under saline stress in coastal ecosystems and optimize water management. An intensive observation experiment was performed within China’s Yellow River Delta to identify the water use processes and crop coefficients (KC) and also quantify the impacts of salt stress on crop water use. The results show that shallow groundwater did not contribute to soil water in the whole rotation; KC values for wheat–maize, wheat–sorghum, and wheat–soybean rotation systems were 45.0, 58.4, and 57% less, respectively, than the FAO values. The water use efficiency of the maize (8.70) and sorghum (9.00) in coastal farmlands was higher than that of the soybean (4.37). By identifying the critical periods of water and salt stress, this paper provides suggestions for water-saving and salinity control in coastal farmlands. Our findings can inform the sustainable development of coastal farmlands and provide new insights to cope with aspects of the global food crisis.

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Water requirements and crop coefficients of edible, spicy and medicinal herbs and vegetables; a review aimed at supporting plant and water management

Pereira,

Mota,

Raziei

et al. 2024

Irrig Sci

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Traditional edible, spicy and medicinal herbs rarely are included in studies on water requirements, evapotranspiration and crop coefficients (Kc) of vegetable crops. While the latter refer to large markets and are used worldwide, the former has small and specialized markets. They are very rarely grown in large farms but rather in small farming systems, or just harvested in the wild, and related evapotranspiration (ET) studies are less frequently considered in main journals focused on water management in agriculture. However, there is abundant bibliography covering traditional edible, spicy and medicinal herbs. Following the partition adopted in recently published articles on Kc values, such crops are grouped according to the main part of the plant purposefully harvested: roots, rhizomes and tubers; leaves and flowers; fruits, pods and seeds. Since we focused on Kc and not on the products, and because many crops have simultaneously two usages such as spicy and medicinal, main uses are presented to characterize the crop. Interestingly, the reviewed crop coefficients have values quite similar to those of the more common and popular vegetable crops. The single crop coefficients reviewed, and referring to the initial, mid-season and end-season periods, are tabulated according to the referred groups. In addition, aiming at their use in water management and modelling, crop heights, root depths, fractions of ground cover and fractions of soil water extraction without stress are also tabulated. In conclusion, this review aimed at successfully provide Kc values to be used for computing crop evapotranspiration for irrigation scheduling and crop water management of the referred herbs and vegetables.

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Estimation of Evapotranspiration and Crop Coefficient of Chinese Cabbage Using Eddy Covariance in Northwest China

Cited by 7 publications

References 31 publications

Driving Factors and Numerical Simulation of Evapotranspiration of a Typical Cabbage Agroecosystem in the Shiyang River Basin, Northwest China

Driving Factors and Numerical Simulation of Evapotranspiration of a Typical Cabbage Agroecosystem in the Shiyang River Basin, Northwest China

Irrigation Optimization via Crop Water Use in Saline Coastal Areas—A Field Data Analysis in China’s Yellow River Delta

Water requirements and crop coefficients of edible, spicy and medicinal herbs and vegetables; a review aimed at supporting plant and water management

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