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	Using stable isotopes to determine seasonal variations in water uptake of summer maize under different fertilization treatments
	Ma Y.; Song, X. F.
	2016
关键词	Root water uptake Dual stable isotopes MixSIAR model Fertilization Summer maize winter-wheat plant irrigation depth soil evapotranspiration management dynamics growth region
英文摘要	Fertilization and water both affect root water uptake in the nutrient and water cycle of the Soil-Plant Atmosphere-Continuum (SPAC). In this study, dual stable isotopes (D and 180) were used to determine seasonal variations in water uptake patterns of summer maize under different fertilization treatments in Beijing, China during 2013-2014. The contributions of soil water at different depths to water uptake were quantified by the MixSIAR Bayesian mixing model. Water uptake was mainly sourced from soil water in the 0-20 cm depth at the seeding (67.7%), jointing (60.5%), tasseling (47.5%), dough (41A%), and harvest (43.9%) stages, and the 20-50 cm depth at the milk stage (32.8%). Different levels of fertilization application led to considerable differences in the proportional contribution of soil water at 0-20 cm (6.0-58.5%) and 20-50 cm (6.1-26.3%). There was lithe difference of contributions in the deep layers (50-200 cm) among treatments in 2013, whereas differences were observed in 50-90 cm at the milk stage and 50-200 cm al the dough stage during 2014. The main water uptake depth was concentrated in the upper soil layers (0-50 cm) during the wet season (2013), whereas a seasonal drought in 2014 promoted the contribution of soil water in deep layers. The contribution of soil water was significantly and positively correlated with the proportions of root length (r = 0.753, p < 0.01). The changes of soil wafer distribution were consistent with the seasonal variation in water uptake paLlems. The present study identified water sources for summer maize under varying fertilization treatments and provided scientific implications for fertilization and irrigation management. (C) 2016 Elsevier All rights reserved.
出处	Science of the Total Environment
卷	550
页	471-483
语种	英语
ISSN号	0048-9697
DOI标识	10.1016/j.scitotenv.2016.01.148
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43140]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Ma Y.,Song, X. F.. Using stable isotopes to determine seasonal variations in water uptake of summer maize under different fertilization treatments. 2016.

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