Evapotranspiration and crop coefficient of spring maize with plastic mulch using eddy covariance in northwest China

Li, Sien; Kang, Shaozhong; Li, Fusheng; Zhang, Lu

doi:10.1016/j.agwat.2008.04.014

Cited by 152 publications

(71 citation statements)

References 20 publications

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“…The model contains a module which can consider the influence of the plastic mulch according to the actual situation. The model provides two alternative methods i.e., a simplified procedure described in Doorenbos and Pruitt [58] and the parametric equation proposed by Liu et al [1] to evaluate the deep percolation and capillary rise. Considering the available data (soil water parameters, LAI and water table depths) (Figure 3), the parametric equation proposed by Liu et al [34] was chosen to calculate the deep percolation and capillary rise.…”

Section: Simdualkc Modelmentioning

confidence: 99%

“…Crop evapotranspiration (ET c ) consumes a large amount of irrigation water, especially in arid areas; thus, accurate estimation of evapotranspiration is the basis of hydrological modeling and agricultural water management [1]. Transpiration (T) through plant stomata is a desirable component because this process is usually associated with plant productivity; evaporation (E) over bare soil is usually considered as water loss but sometimes also provides a benefit for maintaining a micro-climate around the crop under conditions of high irrigation levels [2]; therefore, ET c partitioning is essential for agriculture water resource management as well as hydrological modeling [3,4].…”

Section: Introductionmentioning

confidence: 99%

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

Tian

Yang

et al. 2016

Water

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Estimation of field crop evapotranspiration (ET c ) 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 (ET c 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 ET c act is consistent with observed ET c 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 ET c 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 ET c 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.

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Section: Simdualkc Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Tian

Yang

et al. 2016

Water

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“…The LAI was calculated by summing the leaf area per plant (measured using an AM300 area meter) and multiplying that total by an empirical factor of 0.74 [40] and the total number of plants (24 rows × 56 plants per row). This value was then divided by the total planted area (319.9 m 2 ) ( Table 5).…”

Section: Evapotranspiration and Bare Soil Evaporationmentioning

confidence: 99%

Impact of Groundwater Level on Nitrate Nitrogen Accumulation in the Vadose Zone Beneath a Cotton Field

Jiao

Maimaitiyiming

Salahou

et al. 2017

Water

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Abstract:In this study, the impacts of groundwater level on nitrate nitrogen accumulation in the vadose zone of a cotton field were investigated. Experiments were conducted in a cotton field at the CAS Ecological Agricultural Experiment Station in Nanpi from 2008 to 2010. A vertical observation well was drilled, and time-domain reflectometry probes and soil solution extractors were installed every 50 cm in the walls of the well to a depth of 5 m. The soil water content was monitored, and soil solution samples were obtained and analyzed every six days throughout the growing seasons during the three studied years. Additionally, a water consumption experiment was conducted, and the topsoil water content and leaf area index were measured in the cotton field. The resulting data were used to estimate parameters for use in a soil hydraulic and nitrate nitrogen movement model, and cotton evapotranspiration was calculated using the Penman-Monteith method. Groundwater level increases and decreases of ±4 m were simulated during a ten-year period using HYDRUS-1D. The results showed significant nitrate nitrogen accumulation in the vadose zone when the groundwater level remained unchanged or decreased, with increased accumulation as the groundwater depth increased. Additionally, increased precipitation and a deeper groundwater level resulted in greater nitrate nitrogen leaching in the cotton root zone. Therefore, irrigation and fertilization strategies should be adjusted based on precipitation conditions and groundwater depth.

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“…Using this irrigation method, the fraction of transpiration over ET can be markedly increased by delivering water precisely to the root zone and by eliminating of the majority of useless soil evaporation via mulching (Zhang et al, 2014). Soil thermal conditions are also improved by mulching to ensure crop germination and seedling growth (Bonachela et al, 2001;Hou et al, 2010;Li et al, 2008). In 2009, mulched drip irrigation was adopted in fields with an area amounting to more than 1.2 million hectares in the Xinjiang Province of China.…”

Section: Introductionmentioning

confidence: 99%

A comparison of methods for determining field evapotranspiration: photosynthesis system, sap flow, and eddy covariance

Zhang

Tian

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract.A multi-scale, multi-technique study was conducted to measure evapotranspiration and its components in a cotton field under mulched drip irrigation conditions in northwestern China. Three measurement techniques at different scales were used: a photosynthesis system (leaf scale), sap flow (plant scale), and eddy covariance (field scale). The experiment was conducted from July to September 2012. To upscale the evapotranspiration from the leaf to plant scale, an approach that incorporated the canopy structure and the relationships between sunlit and shaded leaves was proposed. To upscale the evapotranspiration from the plant to field scale, an approach based on the transpiration per unit leaf area was adopted and modified to incorporate the temporal variability in the relationship between leaf areas and stem diameter. At the plant scale, the estimate of the transpiration based on the photosynthesis system with upscaling was slightly higher (18 %) than that obtained by sap flow. At the field scale, the estimates of transpiration derived from sap flow with upscaling and eddy covariance showed reasonable consistency during the cotton's open-boll growth stage, during which soil evaporation can be neglected. The results indicate that the proposed upscaling approaches are reasonable and valid. Based on the measurements and upscaling approaches, evapotranspiration components were analyzed for a cotton field under mulched drip irrigation. During the two analyzed sub-periods in July and August, evapotranspiration rates were 3.94 and 4.53 m day −1 , respectively. The fraction of transpiration to evapotranspiration reached 87.1 % before drip irrigation and 82.3 % after irrigation. The high fraction of transpiration over evapotranspiration was principally due to the mulched film above the drip pipe, low soil water content in the inter-film zone, well-closed canopy, and high water requirement of the crop.

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Evapotranspiration and crop coefficient of spring maize with plastic mulch using eddy covariance in northwest China

Cited by 152 publications

References 20 publications

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

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

Impact of Groundwater Level on Nitrate Nitrogen Accumulation in the Vadose Zone Beneath a Cotton Field

A comparison of methods for determining field evapotranspiration: photosynthesis system, sap flow, and eddy covariance

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