干旱区生态环境知识资源中心(Arid): Modelling water utilization patterns in apple orchards with varying canopy sizes and different growth stages in semi-arid environments

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DOI	10.1016/j.scienta.2021.110051
	Modelling water utilization patterns in apple orchards with varying canopy sizes and different growth stages in semi-arid environments
	Mobe, Nompumelelo Thelma; Dzikiti, Sebinasi; Dube, Timothy; Mazvimavi, Dominic; Ntshidi, Zanele
通讯作者	Mobe, NT (corresponding author), CSIR, Stellenbosch, South Africa.
来源期刊	SCIENTIA HORTICULTURAE
ISSN	0304-4238
EISSN	1879-1018
出版年	2021
卷号	283
英文摘要	Accurate estimates of orchard evapotranspiration (ET) and its components are important for precise irrigation scheduling, irrigation system designs, and optimal on-farm water allocation particularly in water-limited environments. Direct measurements of ET remain costly, laborious and sometimes difficult to apply over heterogeneous surfaces such as crop fields. Therefore, accurate crop water-use models are required for on-farm precise water resources management. In this study, we adopted and improved the Priestley-Taylor Jet Propulsion Laboratory (PT-JPL) model developed by Fisher et al 2008 to estimate crop water use across different apple plants. Specifically, the model was developed to quantify the partitioning of apple orchard water use into beneficial (tree transpiration) and non-beneficial water use (orchard floor evaporation) as influenced by tree canopy cover. Data were collected in twelve orchards spread across key apple producing regions in the Western Cape Province of South Africa over three growing seasons (2014/15, 2015/16, 2016/17). Model ET estimates were tested against ET data measured; using the eddy covariance method and transpiration measured based on sap flow monitoring techniques. The results showed that the original Fisher PT-JPL model performed poorly in ET estimation across all the orchards under study. The model yielded lower R-2, ranging from 0.02 to 0.64 and Nash-Sutcliffe Efficiency (NSE) from -10.93 to 0.20. Thus, we subsequently improved the model by incorporating soil moisture and vapour pressure deficit stress factors and by introducing a variable Priestley and Taylor coefficient (a). The modified PT-JPL model demonstrated an improvement in ET estimates. The root mean square of error (RMSE) of the estimated daily ET varied from +/- 0.60 mm/d to +/- 1.99 mm/d whereas the mean absolute error (MAE) varied from +/- 0.49 mm/d to +/- 1.91 mm/d, while the R-2 varied from 0.54 to 0.75 in orchards with varying canopy cover. The findings of this work underscore the utility of the modified PT-JPL model for estimating ET and its components in apple orchards from planting until the trees reach full-bearing age.
英文关键词	Malus domestica ET partitioning Soil evaporation Stress factors Transpiration Water resources management
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000653998500010
WOS关键词	PRIESTLEY-TAYLOR MODEL ; SAP FLOW ; HEAT-FLUX ; EVAPOTRANSPIRATION ; EVAPORATION ; CROP ; TRANSPIRATION ; IRRIGATION ; ALGORITHMS ; SCALE
WOS类目	Horticulture
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368737
作者单位	[Mobe, Nompumelelo Thelma; Ntshidi, Zanele] CSIR, Smart Pl Cluster, POB 395 7 Meiring Naude, ZA-0001 Pretoria, South Africa; [Dzikiti, Sebinasi] Stellenbosch Univ, Dept Hort Sci, P Bag X1, ZA-7602 Matieland, South Africa; [Mobe, Nompumelelo Thelma; Dube, Timothy; Mazvimavi, Dominic; Ntshidi, Zanele] Univ Western Cape, Inst Water Studies, Dept Earth Sci, P Bag X17, ZA-7535 Bellville, South Africa
推荐引用方式 GB/T 7714	Mobe, Nompumelelo Thelma,Dzikiti, Sebinasi,Dube, Timothy,et al. Modelling water utilization patterns in apple orchards with varying canopy sizes and different growth stages in semi-arid environments[J],2021,283.
APA	Mobe, Nompumelelo Thelma,Dzikiti, Sebinasi,Dube, Timothy,Mazvimavi, Dominic,&Ntshidi, Zanele.(2021).Modelling water utilization patterns in apple orchards with varying canopy sizes and different growth stages in semi-arid environments.SCIENTIA HORTICULTURAE,283.
MLA	Mobe, Nompumelelo Thelma,et al."Modelling water utilization patterns in apple orchards with varying canopy sizes and different growth stages in semi-arid environments".SCIENTIA HORTICULTURAE 283(2021).