Seasonal variation in water uptake patterns of three plant species based on stable isotopes in the semi-arid Loess Plateau

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	Seasonal variation in water uptake patterns of three plant species based on stable isotopes in the semi-arid Loess Plateau
	Lu, Nan; Wang, Jian; Fu, Bojie; Zhang, Li
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2017-12-31
卷号	609 期号:5 页码:27-37
关键词	Water Uptake Pattern Mixsiar Dual Stable Isotopes Loess Plateau Root Distribution
英文摘要	Water is a limiting factor and significant driving force for ecosystem processes in arid and semi-arid areas. Knowledge of plant water uptake pattern is indispensable for understanding soil-plant interactions and species coexistence. The 'Grain for Green' project that started in 1999 in the Loess Plateau of China has led to large scale vegetation change. However, little is known about the water uptake patterns of the main plant species that inhabit in this region. In this study, the seasonal variations in water uptake patterns of three representative plant species, Stipa bungeana, Artemisia gmelinii and Vitex negundo, that are widely distributed in the semi-arid area of the Loess Plateau, were identified by using dual stable isotopes of delta H-2 and delta O-18 in plant and soil water coupled with a Bayesian mixing model MixSIAR. The soil water at the 0-120 cm depth contributed 79.54 +/- 6.05% and 79.94 +/- 8.81% of the total water uptake of S. bungeana and A. gmelinii, respectively, in the growing season. The 0-40 cm soil contributed the most water in July (74.20 +/- 15.20%), and the largest proportion of water (33.10 +/- 15.20%) was derived from 120-300 cm soils in August for A. gmelinii. However, V. negundo obtained water predominantly from surface soil horizons (0-40 cm) and then switched to deep soil layers (120-300 cm) as the season progressed. This suggested that V. negundo has a greater degree of ecological plasticity as it could explore water sources from deeper soils as the water stress increased. This capacity can mainly be attributed to its functionally dimorphic root system. V. negundo may have a competitive advantage when encountering short-term drought. The ecological plasticity of plant water use needs to be considered in plant species selection and ecological management and restoration of the arid and semi-arid ecosystems in the Loess Plateau. (C) 2017 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39100]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Lu, Nan,Wang, Jian,Fu, Bojie,et al. Seasonal variation in water uptake patterns of three plant species based on stable isotopes in the semi-arid Loess Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,609(5):27-37.
APA	Lu, Nan,Wang, Jian,Fu, Bojie,&Zhang, Li.(2017).Seasonal variation in water uptake patterns of three plant species based on stable isotopes in the semi-arid Loess Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,609(5),27-37.
MLA	Lu, Nan,et al."Seasonal variation in water uptake patterns of three plant species based on stable isotopes in the semi-arid Loess Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 609.5(2017):27-37.