干旱区生态环境知识资源中心(Arid): Effects of groundwater and seasonal streamflow on the symbiotic nitrogen fixation of deep-rooted legumes in a dryland floodplain

Arid

DOI	10.1016/j.geoderma.2023.116490
	Effects of groundwater and seasonal streamflow on the symbiotic nitrogen fixation of deep-rooted legumes in a dryland floodplain
	Li, Meimei; Petrie, Matthew D.; Chen, Hao; Zeng, Fanjiang; Ahmed, Zeeshan; Sun, Xibin
通讯作者	Chen, H
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2023
卷号	434
英文摘要	Biological nitrogen fixation of deep-rooted legumes is a major pathway of nitrogen (N) inputs to drylands. Water sources including groundwater and streamflow are vital to the growth of deep-rooted legumes in drylands, but it is unclear how their different availability and biochemical properties may influence plant N fixation. We established two sampling transects at the southern fringe of the Taklimakan Desert (Xinjiang province, north-west China) to study the effects of both the groundwater depth and distance to a seasonally active river on the N fixation rate of Alhagi sparsifolia, a dominant deep-rooted legume species. We quantified the N fixation rate of A. sparsifolia using the 15N natural abundance method, and related variation in N fixation to water source use and soil biochemical properties along the two transects. The N fixation rate of A. sparsifolia decreased with groundwater depth and increased with distance from the river channel. Instead of variation in the water source or nutrient concentrations, we found that the gradient in salinity formed by groundwater flow and streamflow was most responsible for the spatial pattern in N fixation of A. sparsifolia. In many dryland regions, water availability controls the spatial variability of symbiotic N fixation along hydrological gradients. Our study system provides a contrasting condition where salinity most strongly regulates N fixation. In addition to understanding the important role of variation in water source and nutrient availability, our study suggests that the impact of soil salinity in mediating N fixation in dryland ecosystems is deserving of attention.
英文关键词	Drylands Nitrogen fixation Legumes Riparian zone Salinity Groundwater depth
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000993027600001
WOS关键词	PERENNIAL PLANTS ; RIPARIAN PLANTS ; RIVER OASIS ; WATER ; AVAILABILITY ; ECOSYSTEMS ; SALINITY ; DESERT ; METABOLISM ; VEGETATION
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396691
推荐引用方式 GB/T 7714	Li, Meimei,Petrie, Matthew D.,Chen, Hao,et al. Effects of groundwater and seasonal streamflow on the symbiotic nitrogen fixation of deep-rooted legumes in a dryland floodplain[J],2023,434.
APA	Li, Meimei,Petrie, Matthew D.,Chen, Hao,Zeng, Fanjiang,Ahmed, Zeeshan,&Sun, Xibin.(2023).Effects of groundwater and seasonal streamflow on the symbiotic nitrogen fixation of deep-rooted legumes in a dryland floodplain.GEODERMA,434.
MLA	Li, Meimei,et al."Effects of groundwater and seasonal streamflow on the symbiotic nitrogen fixation of deep-rooted legumes in a dryland floodplain".GEODERMA 434(2023).