tailieunhanh - Parametric modeling of root length density and root water uptake in unsaturated soil

The problem of water movement through the root zone has attracted increasing interest during the last few decades. In this research, the spatial and temporal pattern of root water uptake in wetted soil was studied in the root zone of a 6-year-old apple tree. | Research Article Turk J Agric For 34 (2010) 439-449 © TÜBİTAK doi: Parametric modeling of root length density and root water uptake in unsaturated soil Sina BESHARAT1,*, Amir Hossein NAZEMI2, Ali Ashraf SADRADDINI2 1 Department of Water Engineering, Faculty of Agriculture, University of Urmia, Urmia - IRAN 2Department of Water Engineering, Faculty of Agriculture, University of Tabriz, Tabriz - IRAN Received: Abstract: The problem of water movement through the root zone has attracted increasing interest during the last few decades. In this research, the spatial and temporal pattern of root water uptake in wetted soil was studied in the root zone of a 6-year-old apple tree. An important part of the root water uptake model is root length density, which was measured by sampling soil cores in one quarter of the root zone. The exponential model better described the observed apple root distribution. The measured data were compared against the outputs of the root density distribution model. A normalized root length density was used to simulate root water uptake and determine the effect of root distribution on the water content pattern. A 2-dimensional (2D) model of root water uptake was established, which includes root density distribution function, potential transpiration, and the soil water stress-modified factor. Root water uptake distribution was measured with an array of time domain reflectometry (TDR) probes. Root water uptake parameters were optimized by minimizing the residuals between measured and simulated soil water content values. Studies showed that the maximum root water uptake was at a depth of 10-50 cm. The results indicated an excellent agreement between the measured and the simulated values, proving that the developed root water uptake model is effective and feasible. Key words: Modeling, optimization, root distribution, TDR, water flow Introduction An understanding of crop root distributions and water uptake patterns

• Nông nghiệp
• Root distribution
• Water flow
• Parametric modeling
• Time domain reflectometry
• Patterns on soil water dynamics
• Caragana microphylla
• Grasses coexistence
• Fine root production
• Root forage strategy
• Root behavior
• Root length
• Root mass
• Dry matter
• Grape rootstocks
• Saline soil
• Plant Biology
• Bread wheat
• Root phenomics
• Root system morphology
• Root lesion nematode
• Chickpea and maize
• Chickpea maize crop rotation
• Pratylenchus thornei
• Root zone density
• Soil moisture distribution
• Sub surface irrigation
• Uniform distribution
• Sub surface drip irrigation
• Level of biofilms strategy
• Dry root rot
• Rhizoctonia bataticola
• Disease incidence
• Rhizoctonia bataticola in parts
• Dry root rot of chickpea
• Phosphorus use efficiency
• Phosphorus deficiency
• Root exudates
• Spatial distribution of phosphorus
• RNA seq
• Gene expression
• nước
• nước ngầm
• môi trường
• tự nhiên
• Technologies
• Averaging
• Conservation of mass
• Multiphase flow models
• Multiphase flow notation
• distribution functions
• báo cáo khoa học
• báo cáo y học
• công trình nghiên cứu về y học
• tài liệu về y học
• cách trình bày báo cáo
• Báo cáo lâm nghiệp hay
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp
• Ripening
• Senescence Process
• Root Produced
• Volatile Secondary
• Metabolites
• Mediating Soil Interactions
• BMC Plant Biology
• Trade off
• Length distribution
• Image analysis
• Nutrient depletion zone
• Drip irrigation
• Wetting pattern
• Application rate
• Cucumber (Cucumis sativus) crop
• Flood irrigation system
• Turkish Journal of Agriculture and Forestry
• Tạp chí Nông Lâm nghiệp
• Robinia pseudoacacia
• Yellow River Delta
• Stand age
• Fine roots
• Abiotic factors
• Plant parasitic nematodes associated
• Plant Parasitic nematodes
• Community analysis
• Root knot
• Nematode communities revealed