Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species

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	Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species
	Yuan, Chuan; Gao, Guangyao; Fu, Bojie
刊名	HYDROLOGY AND EARTH SYSTEM SCIENCES
	2017-03-09
卷号	21 期号:3 页码:1421-1438
关键词	Pharmaceuticals Personal Care Products Endocrine Disrupting Chemicals Risk Ranking Bohai Coastal Region
英文摘要	Stemflow transports nutrient-enriched precipitation to the rhizosphere and functions as an efficient terrestrial flux in water-stressed ecosystems. However, its ecological significance has generally been underestimated because it is relatively limited in amount, and the biotic mechanisms that affect it have not been thoroughly studied at the leaf scale. This study was conducted during the 2014 and 2015 rainy seasons at the northern Loess Plateau of China. We measured the branch stemflow volume (SFb), shrub stemflow equivalent water depth (SFd), stemflow percentage of incident precipitation (SF %), stemflow productivity (SFP), funnelling ratio (FR), the meteorological characteristics and the plant traits of branches and leaves of C. korshinskii and S. psammophila. This study evaluated stemflow efficiency for the first time with the combined results of SFP and FR, and sought to determine the inter-and intra-specific differences of stemflow yield and efficiency between the two species, as well as the specific bio-/abiotic mechanisms that affected stemflow. The results indicated that C. korshinskii had a greater stemflow yield and efficiency at all precipitation levels than that of S. psammophila. The largest inter-specific difference generally occurred at the 5-10mm branches during rains of <= 2 mm. Precipitation amount was the most influential meteorological characteristic that affected stemflow yield and efficiency in these two endemic shrub species. Branch angle was the most influential plant trait on FR. For SFb, stem biomass and leaf biomass were the most influential plant traits for C. korshinskii and S. psammophila, respectively. For SFP of these two shrub species, leaf traits (the individual leaf area) and branch traits (branch size and biomass allocation pattern) had a great influence during lighter rains <= 10mm and heavier rains > 15 mm, respectively. The lower precipitation threshold to start stemflow allowed C. korshinskii (0.9mm vs. 2.1mm for S. psammophila) to employ more rains to harvest water via stemflow. The beneficial leaf traits (e.g., leaf shape, arrangement, area, amount) might partly explain the greater stemflow production of C. korshinskii. Comparison of SFb between the foliated and manually defoliated shrubs during the 2015 rainy season indicated that the newly exposed branch surface at the defoliated period and the resulting rainfall intercepting effects might be an important mechanism affecting stemflow in the dormant season.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/38973]
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	Yuan, Chuan,Gao, Guangyao,Fu, Bojie. Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2017,21(3):1421-1438.
APA	Yuan, Chuan,Gao, Guangyao,&Fu, Bojie.(2017).Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species.HYDROLOGY AND EARTH SYSTEM SCIENCES,21(3),1421-1438.
MLA	Yuan, Chuan,et al."Comparisons of stemflow and its bio-/abiotic influential factors between two xerophytic shrub species".HYDROLOGY AND EARTH SYSTEM SCIENCES 21.3(2017):1421-1438.