Applying stable isotopes to determine seasonal variability in evapotranspiration partitioning of winter wheat for optimizing agricultural management practices

doi:10.1016/j.scitotenv.2018.11.176

	Applying stable isotopes to determine seasonal variability in evapotranspiration partitioning of winter wheat for optimizing agricultural management practices
	Ma, Ying; Song, Xianfang
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2019-03-01
卷号	654 页码:633-642
关键词	Evapotranspiration partitioning Seasonal variations Crop development Water use efficiency Stable isotopes Irrigation management
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2018.11.176
通讯作者	Ma, Ying(maying@igsnrr.ac.cn)
英文摘要	The partitioning of evapotranspiration (ET) into soil evaporation (E) and crop transpiration (T) is fundamental for accurately monitoring agro-hydrological processes, assessing crop productivity, and optimizing water management practices. In this study, the isotope tracing technique was used to partition ET of winter wheat under different irrigation (100, 160 and 240 mm) and fertilization (105, 210 and 315 kg N ha(-1)) treatments during the 2014 and 2015 growing seasons in Beijing, China. The correlations between seasonal ET partitioning and the leaf area index (DM), grain yield, and water use efficiency (WUE, ratio of crop yield and Ell were investigated and agricultural management practices were optimized. The fraction of T in ET (F-T) between the greening and harvest seasons was 0.82 on average and did not vary significantly among the treatments (p > 0.05). However, the values of F-T during the individual growth periods ranged from 0.51 to 0.98, and they were remarkably distinct for all treatments. The seasonal variability in F(T )could be effectively explained via a power-law function of the LAI (F-T = 0.61 LAI(0.21), R-2 0.66, p < 0.01). There was no significant relationship between F-T and the grain yield or WUE (p > 0.05). The total T during the jointing-heading and heading-filling periods (T-jf) had significantly quadratic relationships with the crop yield and WUE (p < 0.01). Both the crop yield and the WUE had high values under the T-jf range of 117.5-155.8 mm. Furthermore, the WUE was higher under larger ratio of E in ET (F-E) during the greening-jointing period and lower F-E during the filling-harvest period. Two irrigations during the greening-jointing (20 mm) and heading-filling (80 mm) stages and one fertilization ( 105 kg ha(-1) N) during the greening-jointing stage were determined as appropriate irrigation and fertilization schedules. (C) 2018 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[41671027] ; National Natural Science Foundation of China[41730749]
WOS关键词	WATER-USE EFFICIENCY ; SOIL EVAPORATION ; PLANT TRANSPIRATION ; CARBON-DIOXIDE ; SUMMER MAIZE ; IRRIGATION ; VAPOR ; ECOSYSTEM ; PATTERNS ; YIELD
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000458630100053
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/49383]
专题	中国科学院地理科学与资源研究所
通讯作者	Ma, Ying
作者单位	Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Ma, Ying,Song, Xianfang. Applying stable isotopes to determine seasonal variability in evapotranspiration partitioning of winter wheat for optimizing agricultural management practices[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,654:633-642.
APA	Ma, Ying,&Song, Xianfang.(2019).Applying stable isotopes to determine seasonal variability in evapotranspiration partitioning of winter wheat for optimizing agricultural management practices.SCIENCE OF THE TOTAL ENVIRONMENT,654,633-642.
MLA	Ma, Ying,et al."Applying stable isotopes to determine seasonal variability in evapotranspiration partitioning of winter wheat for optimizing agricultural management practices".SCIENCE OF THE TOTAL ENVIRONMENT 654(2019):633-642.