气候变化领域集成服务门户(CCPortal): Responses of riparian forests to flood irrigation in the hyper-arid zone of NW China

CCPortal

DOI	10.1016/j.scitotenv.2018.08.287
	Responses of riparian forests to flood irrigation in the hyper-arid zone of NW China
	Yu, Tengfei; Feng, Qi; Si, Jianhua; Xi, Haiyang; O'Grady, Anthony P.; Pinkard, Elizabeth A.
发表日期	2019
ISSN	0048-9697
EISSN	1879-1026
卷号	648
英文摘要	Knowledge of forest water use is crucial to water resources managers, especially in arid environments. Flood irrigation has sometimes been used to ameliorate forest decline, however, there has only been limited research on vegetation responses to these interventions. We undertook a study to quantify evapotranspiration (ET) and its components, transpiration (T) and evaporation (E), of two Populus euphratica Oliv. stands (MA: middle-aged and OA: old-aged) with and without flood irrigation in the lower Heihe River Basin of NW China. ET and T were measured using eddy covariance and sap flow methods, respectively. Understory E was estimated by difference. Annual ET was 766.4 mm in the MA stand and 532.5 mm in the OA stand with an average of 4.2 and 2.9 mm d(-1) during the growing season, respectively. ET of the MA stand was 44% higher than that of the OA stand, with contributions of 28% and 16% from E and T. Despite stand density, leaf area index and canopy cover being higher in the MA than OA stand sapwood area within the two stands was similar (MA 6.04 m(2) ha(-1) and OA 6.02 m(2) ha(-1)). We hypothesised lower understory E and a lower E to ET ratio in the MA stand than OA stand. However, E was approximately 63% of ET in both stands. Therefore, we conclude that differences in ET, T and E were mainly associated with the flood irrigation. This was further supported by the comparable ET between the OA stand and the other studies in arid regions of Central Asia. In conclusion, flood irrigation has a less significant effect on canopy water use (T) than understory E suggesting alternatives to flood irrigation might be more appropriate in this water-limited ecosystem. (c) 2018 Elsevier B.V. All rights reserved.
关键词	Flood irrigation Evapotranspiration Eddy covariance Sap flow Riparian forests Hyper-arid zone
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112097
作者单位	Chinese Acad Sci, Alax Desert Ecohydrol Expt Res Stn, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Yu, Tengfei,Feng, Qi,Si, Jianhua,et al. Responses of riparian forests to flood irrigation in the hyper-arid zone of NW China[J]. 中国科学院西北生态环境资源研究院,2019,648.
APA	Yu, Tengfei,Feng, Qi,Si, Jianhua,Xi, Haiyang,O'Grady, Anthony P.,&Pinkard, Elizabeth A..(2019).Responses of riparian forests to flood irrigation in the hyper-arid zone of NW China.SCIENCE OF THE TOTAL ENVIRONMENT,648.
MLA	Yu, Tengfei,et al."Responses of riparian forests to flood irrigation in the hyper-arid zone of NW China".SCIENCE OF THE TOTAL ENVIRONMENT 648(2019).