Evaluation of seasonal patterns of hydraulic redistribution in a humid subtropical area, East China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Evaluation of seasonal patterns of hydraulic redistribution in a humid subtropical area, East China
	Sun, Long; Yang, Lei; Chen, Liding; Yen, Haw; Zhao, Fangkai; Li, Shoujuan
刊名	HYDROLOGICAL PROCESSES
	2020-02-15
卷号	34 期号:4 页码:1052-1062
关键词	antecedent soil moisture normalized hydraulic redistribution shallow soil soil moisture dynamics soil water use temporal variation water replenishment Zhangxi watershed
ISSN号	0885-6087
英文摘要	Antecedent soil moisture or soil moisture status has a great impact on hydrological processes. Hydraulic redistribution (HR), a widely observed phenomenon, is defined as water distributed (typically at night) from moist soil to drier soil via plant roots, which plays an important role in soil moisture replenishment. Knowledge on seasonal patterns of HR and on the relationship between HR and soil water use is not fully understood. We investigated temporal variations in HR and total daily water use (Delta theta) at stands of camphor and peach by monitoring soil moisture content in a humid region in eastern China. HR at the three locations reached its maximum values in summer (0.68 mm d(-1) to 1.15 mm d(-1)) at depths of 15 cm and 35 cm. Redistributed water replenished 41% of water depleted in the soil at a 5-45-cm depth. Interestingly, normalized HR (i.e., HR/Delta theta) showed a constant pattern during the growing season implying it is independent of seasonal climate alterations. This also indicated that HR had a stable effect on the replenishment of daily water use. Positive linear relationships between HR and Delta theta were found at three measuring locations (camphor: R-2 = .35, p < .01; peach1: R-2 = .57, p < .01; peach2: R-2 = .63, p < .01), suggesting a relatively stable inherent linkage between HR and Delta theta. This study suggested that hydrological processes involving soil moisture status or antecedent soil moisture, needs to take the HR effect into account across timescales from intraday to seasonal.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44311]
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	Sun, Long,Yang, Lei,Chen, Liding,et al. Evaluation of seasonal patterns of hydraulic redistribution in a humid subtropical area, East China[J]. HYDROLOGICAL PROCESSES,2020,34(4):1052-1062.
APA	Sun, Long,Yang, Lei,Chen, Liding,Yen, Haw,Zhao, Fangkai,&Li, Shoujuan.(2020).Evaluation of seasonal patterns of hydraulic redistribution in a humid subtropical area, East China.HYDROLOGICAL PROCESSES,34(4),1052-1062.
MLA	Sun, Long,et al."Evaluation of seasonal patterns of hydraulic redistribution in a humid subtropical area, East China".HYDROLOGICAL PROCESSES 34.4(2020):1052-1062.